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/pci.h"
  22 #include "pci/msix.h"
  23 #include "sysemu/kvm.h"
  24 #include "migration/migration.h"
  25 #include "qapi/qmp/qerror.h"
  26 #include "qemu/event_notifier.h"
  27 #include "char/char.h"
  28
  29 #include <sys/mman.h>
  30 #include <sys/types.h>
  31
  32 #define PCI_VENDOR_ID_IVSHMEM   PCI_VENDOR_ID_REDHAT_QUMRANET
  33 #define PCI_DEVICE_ID_IVSHMEM   0x1110
  34
  35 #define IVSHMEM_IOEVENTFD   0
  36 #define IVSHMEM_MSI     1
  37
  38 #define IVSHMEM_PEER    0
  39 #define IVSHMEM_MASTER  1
  40
  41 #define IVSHMEM_REG_BAR_SIZE 0x100
  42
  43 //#define DEBUG_IVSHMEM
  44 #ifdef DEBUG_IVSHMEM
  45 #define IVSHMEM_DPRINTF(fmt, ...)        \
  46     do {printf("IVSHMEM: " fmt, ## __VA_ARGS__); } while (0)
  47 #else
  48 #define IVSHMEM_DPRINTF(fmt, ...)
  49 #endif
  50
  51 typedef struct Peer {
  52     int nb_eventfds;
  53     EventNotifier *eventfds;
  54 } Peer;
  55
  56 typedef struct EventfdEntry {
  57     PCIDevice *pdev;
  58     int vector;
  59 } EventfdEntry;
  60
  61 typedef struct IVShmemState {
  62     PCIDevice dev;
  63     uint32_t intrmask;
  64     uint32_t intrstatus;
  65     uint32_t doorbell;
  66
  67     CharDriverState **eventfd_chr;
  68     CharDriverState *server_chr;
  69     MemoryRegion ivshmem_mmio;
  70
  71     /* We might need to register the BAR before we actually have the memory.
  72      * So prepare a container MemoryRegion for the BAR immediately and
  73      * add a subregion when we have the memory.
  74      */
  75     MemoryRegion bar;
  76     MemoryRegion ivshmem;
  77     uint64_t ivshmem_size; /* size of shared memory region */
  78     uint32_t ivshmem_attr;
  79     uint32_t ivshmem_64bit;
  80     int shm_fd; /* shared memory file descriptor */
  81
  82     Peer *peers;
  83     int nb_peers; /* how many guests we have space for */
  84     int max_peer; /* maximum numbered peer */
  85
  86     int vm_id;
  87     uint32_t vectors;
  88     uint32_t features;
  89     EventfdEntry *eventfd_table;
  90
  91     Error *migration_blocker;
  92
  93     char * shmobj;
  94     char * sizearg;
  95     char * role;
  96     int role_val;   /* scalar to avoid multiple string comparisons */
  97 } IVShmemState;
  98
  99 /* registers for the Inter-VM shared memory device */
 100 enum ivshmem_registers {
 101     INTRMASK = 0,
 102     INTRSTATUS = 4,
 103     IVPOSITION = 8,
 104     DOORBELL = 12,
 105 };
 106
 107 static inline uint32_t ivshmem_has_feature(IVShmemState *ivs,
 108                                                     unsigned int feature) {
 109     return (ivs->features & (1 << feature));
 110 }
 111
 112 static inline bool is_power_of_two(uint64_t x) {
 113     return (x & (x - 1)) == 0;
 114 }
 115
 116 /* accessing registers - based on rtl8139 */
 117 static void ivshmem_update_irq(IVShmemState *s, int val)
 118 {
 119     int isr;
 120     isr = (s->intrstatus & s->intrmask) & 0xffffffff;
 121
 122     /* don't print ISR resets */
 123     if (isr) {
 124         IVSHMEM_DPRINTF("Set IRQ to %d (%04x %04x)\n",
 125            isr ? 1 : 0, s->intrstatus, s->intrmask);
 126     }
 127
 128     qemu_set_irq(s->dev.irq[0], (isr != 0));
 129 }
 130
 131 static void ivshmem_IntrMask_write(IVShmemState *s, uint32_t val)
 132 {
 133     IVSHMEM_DPRINTF("IntrMask write(w) val = 0x%04x\n", val);
 134
 135     s->intrmask = val;
 136
 137     ivshmem_update_irq(s, val);
 138 }
 139
 140 static uint32_t ivshmem_IntrMask_read(IVShmemState *s)
 141 {
 142     uint32_t ret = s->intrmask;
 143
 144     IVSHMEM_DPRINTF("intrmask read(w) val = 0x%04x\n", ret);
 145
 146     return ret;
 147 }
 148
 149 static void ivshmem_IntrStatus_write(IVShmemState *s, uint32_t val)
 150 {
 151     IVSHMEM_DPRINTF("IntrStatus write(w) val = 0x%04x\n", val);
 152
 153     s->intrstatus = val;
 154
 155     ivshmem_update_irq(s, val);
 156 }
 157
 158 static uint32_t ivshmem_IntrStatus_read(IVShmemState *s)
 159 {
 160     uint32_t ret = s->intrstatus;
 161
 162     /* reading ISR clears all interrupts */
 163     s->intrstatus = 0;
 164
 165     ivshmem_update_irq(s, 0);
 166
 167     return ret;
 168 }
 169
 170 static void ivshmem_io_write(void *opaque, hwaddr addr,
 171                              uint64_t val, unsigned size)
 172 {
 173     IVShmemState *s = opaque;
 174
 175     uint16_t dest = val >> 16;
 176     uint16_t vector = val & 0xff;
 177
 178     addr &= 0xfc;
 179
 180     IVSHMEM_DPRINTF("writing to addr " TARGET_FMT_plx "\n", addr);
 181     switch (addr)
 182     {
 183         case INTRMASK:
 184             ivshmem_IntrMask_write(s, val);
 185             break;
 186
 187         case INTRSTATUS:
 188             ivshmem_IntrStatus_write(s, val);
 189             break;
 190
 191         case DOORBELL:
 192             /* check that dest VM ID is reasonable */
 193             if (dest > s->max_peer) {
 194                 IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n", dest);
 195                 break;
 196             }
 197
 198             /* check doorbell range */
 199             if (vector < s->peers[dest].nb_eventfds) {
 200                 IVSHMEM_DPRINTF("Notifying VM %d on vector %d\n", dest, vector);
 201                 event_notifier_set(&s->peers[dest].eventfds[vector]);
 202             }
 203             break;
 204         default:
 205             IVSHMEM_DPRINTF("Invalid VM Doorbell VM %d\n", dest);
 206     }
 207 }
 208
 209 static uint64_t ivshmem_io_read(void *opaque, hwaddr addr,
 210                                 unsigned size)
 211 {
 212
 213     IVShmemState *s = opaque;
 214     uint32_t ret;
 215
 216     switch (addr)
 217     {
 218         case INTRMASK:
 219             ret = ivshmem_IntrMask_read(s);
 220             break;
 221
 222         case INTRSTATUS:
 223             ret = ivshmem_IntrStatus_read(s);
 224             break;
 225
 226         case IVPOSITION:
 227             /* return my VM ID if the memory is mapped */
 228             if (s->shm_fd > 0) {
 229                 ret = s->vm_id;
 230             } else {
 231                 ret = -1;
 232             }
 233             break;
 234
 235         default:
 236             IVSHMEM_DPRINTF("why are we reading " TARGET_FMT_plx "\n", addr);
 237             ret = 0;
 238     }
 239
 240     return ret;
 241 }
 242
 243 static const MemoryRegionOps ivshmem_mmio_ops = {
 244     .read = ivshmem_io_read,
 245     .write = ivshmem_io_write,
 246     .endianness = DEVICE_NATIVE_ENDIAN,
 247     .impl = {
 248         .min_access_size = 4,
 249         .max_access_size = 4,
 250     },
 251 };
 252
 253 static void ivshmem_receive(void *opaque, const uint8_t *buf, int size)
 254 {
 255     IVShmemState *s = opaque;
 256
 257     ivshmem_IntrStatus_write(s, *buf);
 258
 259     IVSHMEM_DPRINTF("ivshmem_receive 0x%02x\n", *buf);
 260 }
 261
 262 static int ivshmem_can_receive(void * opaque)
 263 {
 264     return 8;
 265 }
 266
 267 static void ivshmem_event(void *opaque, int event)
 268 {
 269     IVSHMEM_DPRINTF("ivshmem_event %d\n", event);
 270 }
 271
 272 static void fake_irqfd(void *opaque, const uint8_t *buf, int size) {
 273
 274     EventfdEntry *entry = opaque;
 275     PCIDevice *pdev = entry->pdev;
 276
 277     IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, entry->vector);
 278     msix_notify(pdev, entry->vector);
 279 }
 280
 281 static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *n,
 282                                                   int vector)
 283 {
 284     /* create a event character device based on the passed eventfd */
 285     IVShmemState *s = opaque;
 286     CharDriverState * chr;
 287     int eventfd = event_notifier_get_fd(n);
 288
 289     chr = qemu_chr_open_eventfd(eventfd);
 290
 291     if (chr == NULL) {
 292         fprintf(stderr, "creating eventfd for eventfd %d failed\n", eventfd);
 293         exit(-1);
 294     }
 295
 296     /* if MSI is supported we need multiple interrupts */
 297     if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
 298         s->eventfd_table[vector].pdev = &s->dev;
 299         s->eventfd_table[vector].vector = vector;
 300
 301         qemu_chr_add_handlers(chr, ivshmem_can_receive, fake_irqfd,
 302                       ivshmem_event, &s->eventfd_table[vector]);
 303     } else {
 304         qemu_chr_add_handlers(chr, ivshmem_can_receive, ivshmem_receive,
 305                       ivshmem_event, s);
 306     }
 307
 308     return chr;
 309
 310 }
 311
 312 static int check_shm_size(IVShmemState *s, int fd) {
 313     /* check that the guest isn't going to try and map more memory than the
 314      * the object has allocated return -1 to indicate error */
 315
 316     struct stat buf;
 317
 318     fstat(fd, &buf);
 319
 320     if (s->ivshmem_size > buf.st_size) {
 321         fprintf(stderr,
 322                 "IVSHMEM ERROR: Requested memory size greater"
 323                 " than shared object size (%" PRIu64 " > %" PRIu64")\n",
 324                 s->ivshmem_size, (uint64_t)buf.st_size);
 325         return -1;
 326     } else {
 327         return 0;
 328     }
 329 }
 330
 331 /* create the shared memory BAR when we are not using the server, so we can
 332  * create the BAR and map the memory immediately */
 333 static void create_shared_memory_BAR(IVShmemState *s, int fd) {
 334
 335     void * ptr;
 336
 337     s->shm_fd = fd;
 338
 339     ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
 340
 341     memory_region_init_ram_ptr(&s->ivshmem, "ivshmem.bar2",
 342                                s->ivshmem_size, ptr);
 343     vmstate_register_ram(&s->ivshmem, &s->dev.qdev);
 344     memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
 345
 346     /* region for shared memory */
 347     pci_register_bar(&s->dev, 2, s->ivshmem_attr, &s->bar);
 348 }
 349
 350 static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i)
 351 {
 352     memory_region_add_eventfd(&s->ivshmem_mmio,
 353                               DOORBELL,
 354                               4,
 355                               true,
 356                               (posn << 16) | i,
 357                               &s->peers[posn].eventfds[i]);
 358 }
 359
 360 static void ivshmem_del_eventfd(IVShmemState *s, int posn, int i)
 361 {
 362     memory_region_del_eventfd(&s->ivshmem_mmio,
 363                               DOORBELL,
 364                               4,
 365                               true,
 366                               (posn << 16) | i,
 367                               &s->peers[posn].eventfds[i]);
 368 }
 369
 370 static void close_guest_eventfds(IVShmemState *s, int posn)
 371 {
 372     int i, guest_curr_max;
 373
 374     if (!ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
 375         return;
 376     }
 377
 378     guest_curr_max = s->peers[posn].nb_eventfds;
 379
 380     memory_region_transaction_begin();
 381     for (i = 0; i < guest_curr_max; i++) {
 382         ivshmem_del_eventfd(s, posn, i);
 383     }
 384     memory_region_transaction_commit();
 385     for (i = 0; i < guest_curr_max; i++) {
 386         event_notifier_cleanup(&s->peers[posn].eventfds[i]);
 387     }
 388
 389     g_free(s->peers[posn].eventfds);
 390     s->peers[posn].nb_eventfds = 0;
 391 }
 392
 393 /* this function increase the dynamic storage need to store data about other
 394  * guests */
 395 static void increase_dynamic_storage(IVShmemState *s, int new_min_size) {
 396
 397     int j, old_nb_alloc;
 398
 399     old_nb_alloc = s->nb_peers;
 400
 401     while (new_min_size >= s->nb_peers)
 402         s->nb_peers = s->nb_peers * 2;
 403
 404     IVSHMEM_DPRINTF("bumping storage to %d guests\n", s->nb_peers);
 405     s->peers = g_realloc(s->peers, s->nb_peers * sizeof(Peer));
 406
 407     /* zero out new pointers */
 408     for (j = old_nb_alloc; j < s->nb_peers; j++) {
 409         s->peers[j].eventfds = NULL;
 410         s->peers[j].nb_eventfds = 0;
 411     }
 412 }
 413
 414 static void ivshmem_read(void *opaque, const uint8_t * buf, int flags)
 415 {
 416     IVShmemState *s = opaque;
 417     int incoming_fd, tmp_fd;
 418     int guest_max_eventfd;
 419     long incoming_posn;
 420
 421     memcpy(&incoming_posn, buf, sizeof(long));
 422     /* pick off s->server_chr->msgfd and store it, posn should accompany msg */
 423     tmp_fd = qemu_chr_fe_get_msgfd(s->server_chr);
 424     IVSHMEM_DPRINTF("posn is %ld, fd is %d\n", incoming_posn, tmp_fd);
 425
 426     /* make sure we have enough space for this guest */
 427     if (incoming_posn >= s->nb_peers) {
 428         increase_dynamic_storage(s, incoming_posn);
 429     }
 430
 431     if (tmp_fd == -1) {
 432         /* if posn is positive and unseen before then this is our posn*/
 433         if ((incoming_posn >= 0) &&
 434                             (s->peers[incoming_posn].eventfds == NULL)) {
 435             /* receive our posn */
 436             s->vm_id = incoming_posn;
 437             return;
 438         } else {
 439             /* otherwise an fd == -1 means an existing guest has gone away */
 440             IVSHMEM_DPRINTF("posn %ld has gone away\n", incoming_posn);
 441             close_guest_eventfds(s, incoming_posn);
 442             return;
 443         }
 444     }
 445
 446     /* because of the implementation of get_msgfd, we need a dup */
 447     incoming_fd = dup(tmp_fd);
 448
 449     if (incoming_fd == -1) {
 450         fprintf(stderr, "could not allocate file descriptor %s\n",
 451                                                             strerror(errno));
 452         return;
 453     }
 454
 455     /* if the position is -1, then it's shared memory region fd */
 456     if (incoming_posn == -1) {
 457
 458         void * map_ptr;
 459
 460         s->max_peer = 0;
 461
 462         if (check_shm_size(s, incoming_fd) == -1) {
 463             exit(-1);
 464         }
 465
 466         /* mmap the region and map into the BAR2 */
 467         map_ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED,
 468                                                             incoming_fd, 0);
 469         memory_region_init_ram_ptr(&s->ivshmem,
 470                                    "ivshmem.bar2", s->ivshmem_size, map_ptr);
 471         vmstate_register_ram(&s->ivshmem, &s->dev.qdev);
 472
 473         IVSHMEM_DPRINTF("guest h/w addr = %" PRIu64 ", size = %" PRIu64 "\n",
 474                          s->ivshmem_offset, s->ivshmem_size);
 475
 476         memory_region_add_subregion(&s->bar, 0, &s->ivshmem);
 477
 478         /* only store the fd if it is successfully mapped */
 479         s->shm_fd = incoming_fd;
 480
 481         return;
 482     }
 483
 484     /* each guest has an array of eventfds, and we keep track of how many
 485      * guests for each VM */
 486     guest_max_eventfd = s->peers[incoming_posn].nb_eventfds;
 487
 488     if (guest_max_eventfd == 0) {
 489         /* one eventfd per MSI vector */
 490         s->peers[incoming_posn].eventfds = g_new(EventNotifier, s->vectors);
 491     }
 492
 493     /* this is an eventfd for a particular guest VM */
 494     IVSHMEM_DPRINTF("eventfds[%ld][%d] = %d\n", incoming_posn,
 495                                             guest_max_eventfd, incoming_fd);
 496     event_notifier_init_fd(&s->peers[incoming_posn].eventfds[guest_max_eventfd],
 497                            incoming_fd);
 498
 499     /* increment count for particular guest */
 500     s->peers[incoming_posn].nb_eventfds++;
 501
 502     /* keep track of the maximum VM ID */
 503     if (incoming_posn > s->max_peer) {
 504         s->max_peer = incoming_posn;
 505     }
 506
 507     if (incoming_posn == s->vm_id) {
 508         s->eventfd_chr[guest_max_eventfd] = create_eventfd_chr_device(s,
 509                    &s->peers[s->vm_id].eventfds[guest_max_eventfd],
 510                    guest_max_eventfd);
 511     }
 512
 513     if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
 514         ivshmem_add_eventfd(s, incoming_posn, guest_max_eventfd);
 515     }
 516 }
 517
 518 /* Select the MSI-X vectors used by device.
 519  * ivshmem maps events to vectors statically, so
 520  * we just enable all vectors on init and after reset. */
 521 static void ivshmem_use_msix(IVShmemState * s)
 522 {
 523     int i;
 524
 525     if (!msix_present(&s->dev)) {
 526         return;
 527     }
 528
 529     for (i = 0; i < s->vectors; i++) {
 530         msix_vector_use(&s->dev, i);
 531     }
 532 }
 533
 534 static void ivshmem_reset(DeviceState *d)
 535 {
 536     IVShmemState *s = DO_UPCAST(IVShmemState, dev.qdev, d);
 537
 538     s->intrstatus = 0;
 539     ivshmem_use_msix(s);
 540 }
 541
 542 static uint64_t ivshmem_get_size(IVShmemState * s) {
 543
 544     uint64_t value;
 545     char *ptr;
 546
 547     value = strtoull(s->sizearg, &ptr, 10);
 548     switch (*ptr) {
 549         case 0: case 'M': case 'm':
 550             value <<= 20;
 551             break;
 552         case 'G': case 'g':
 553             value <<= 30;
 554             break;
 555         default:
 556             fprintf(stderr, "qemu: invalid ram size: %s\n", s->sizearg);
 557             exit(1);
 558     }
 559
 560     /* BARs must be a power of 2 */
 561     if (!is_power_of_two(value)) {
 562         fprintf(stderr, "ivshmem: size must be power of 2\n");
 563         exit(1);
 564     }
 565
 566     return value;
 567 }
 568
 569 static void ivshmem_setup_msi(IVShmemState * s)
 570 {
 571     if (msix_init_exclusive_bar(&s->dev, s->vectors, 1)) {
 572         IVSHMEM_DPRINTF("msix initialization failed\n");
 573         exit(1);
 574     }
 575
 576     IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors);
 577
 578     /* allocate QEMU char devices for receiving interrupts */
 579     s->eventfd_table = g_malloc0(s->vectors * sizeof(EventfdEntry));
 580
 581     ivshmem_use_msix(s);
 582 }
 583
 584 static void ivshmem_save(QEMUFile* f, void *opaque)
 585 {
 586     IVShmemState *proxy = opaque;
 587
 588     IVSHMEM_DPRINTF("ivshmem_save\n");
 589     pci_device_save(&proxy->dev, f);
 590
 591     if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
 592         msix_save(&proxy->dev, f);
 593     } else {
 594         qemu_put_be32(f, proxy->intrstatus);
 595         qemu_put_be32(f, proxy->intrmask);
 596     }
 597
 598 }
 599
 600 static int ivshmem_load(QEMUFile* f, void *opaque, int version_id)
 601 {
 602     IVSHMEM_DPRINTF("ivshmem_load\n");
 603
 604     IVShmemState *proxy = opaque;
 605     int ret;
 606
 607     if (version_id > 0) {
 608         return -EINVAL;
 609     }
 610
 611     if (proxy->role_val == IVSHMEM_PEER) {
 612         fprintf(stderr, "ivshmem: 'peer' devices are not migratable\n");
 613         return -EINVAL;
 614     }
 615
 616     ret = pci_device_load(&proxy->dev, f);
 617     if (ret) {
 618         return ret;
 619     }
 620
 621     if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
 622         msix_load(&proxy->dev, f);
 623         ivshmem_use_msix(proxy);
 624     } else {
 625         proxy->intrstatus = qemu_get_be32(f);
 626         proxy->intrmask = qemu_get_be32(f);
 627     }
 628
 629     return 0;
 630 }
 631
 632 static void ivshmem_write_config(PCIDevice *pci_dev, uint32_t address,
 633                                  uint32_t val, int len)
 634 {
 635     pci_default_write_config(pci_dev, address, val, len);
 636     msix_write_config(pci_dev, address, val, len);
 637 }
 638
 639 static int pci_ivshmem_init(PCIDevice *dev)
 640 {
 641     IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev);
 642     uint8_t *pci_conf;
 643
 644     if (s->sizearg == NULL)
 645         s->ivshmem_size = 4 << 20; /* 4 MB default */
 646     else {
 647         s->ivshmem_size = ivshmem_get_size(s);
 648     }
 649
 650     register_savevm(&s->dev.qdev, "ivshmem", 0, 0, ivshmem_save, ivshmem_load,
 651                                                                         dev);
 652
 653     /* IRQFD requires MSI */
 654     if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) &&
 655         !ivshmem_has_feature(s, IVSHMEM_MSI)) {
 656         fprintf(stderr, "ivshmem: ioeventfd/irqfd requires MSI\n");
 657         exit(1);
 658     }
 659
 660     /* check that role is reasonable */
 661     if (s->role) {
 662         if (strncmp(s->role, "peer", 5) == 0) {
 663             s->role_val = IVSHMEM_PEER;
 664         } else if (strncmp(s->role, "master", 7) == 0) {
 665             s->role_val = IVSHMEM_MASTER;
 666         } else {
 667             fprintf(stderr, "ivshmem: 'role' must be 'peer' or 'master'\n");
 668             exit(1);
 669         }
 670     } else {
 671         s->role_val = IVSHMEM_MASTER; /* default */
 672     }
 673
 674     if (s->role_val == IVSHMEM_PEER) {
 675         error_set(&s->migration_blocker, QERR_DEVICE_FEATURE_BLOCKS_MIGRATION,
 676                   "peer mode", "ivshmem");
 677         migrate_add_blocker(s->migration_blocker);
 678     }
 679
 680     pci_conf = s->dev.config;
 681     pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
 682
 683     pci_config_set_interrupt_pin(pci_conf, 1);
 684
 685     s->shm_fd = 0;
 686
 687     memory_region_init_io(&s->ivshmem_mmio, &ivshmem_mmio_ops, s,
 688                           "ivshmem-mmio", IVSHMEM_REG_BAR_SIZE);
 689
 690     /* region for registers*/
 691     pci_register_bar(&s->dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY,
 692                      &s->ivshmem_mmio);
 693
 694     memory_region_init(&s->bar, "ivshmem-bar2-container", s->ivshmem_size);
 695     s->ivshmem_attr = PCI_BASE_ADDRESS_SPACE_MEMORY |
 696         PCI_BASE_ADDRESS_MEM_PREFETCH;
 697     if (s->ivshmem_64bit) {
 698         s->ivshmem_attr |= PCI_BASE_ADDRESS_MEM_TYPE_64;
 699     }
 700
 701     if ((s->server_chr != NULL) &&
 702                         (strncmp(s->server_chr->filename, "unix:", 5) == 0)) {
 703         /* if we get a UNIX socket as the parameter we will talk
 704          * to the ivshmem server to receive the memory region */
 705
 706         if (s->shmobj != NULL) {
 707             fprintf(stderr, "WARNING: do not specify both 'chardev' "
 708                                                 "and 'shm' with ivshmem\n");
 709         }
 710
 711         IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n",
 712                                                     s->server_chr->filename);
 713
 714         if (ivshmem_has_feature(s, IVSHMEM_MSI)) {
 715             ivshmem_setup_msi(s);
 716         }
 717
 718         /* we allocate enough space for 16 guests and grow as needed */
 719         s->nb_peers = 16;
 720         s->vm_id = -1;
 721
 722         /* allocate/initialize space for interrupt handling */
 723         s->peers = g_malloc0(s->nb_peers * sizeof(Peer));
 724
 725         pci_register_bar(&s->dev, 2, s->ivshmem_attr, &s->bar);
 726
 727         s->eventfd_chr = g_malloc0(s->vectors * sizeof(CharDriverState *));
 728
 729         qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_read,
 730                      ivshmem_event, s);
 731     } else {
 732         /* just map the file immediately, we're not using a server */
 733         int fd;
 734
 735         if (s->shmobj == NULL) {
 736             fprintf(stderr, "Must specify 'chardev' or 'shm' to ivshmem\n");
 737         }
 738
 739         IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj);
 740
 741         /* try opening with O_EXCL and if it succeeds zero the memory
 742          * by truncating to 0 */
 743         if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR|O_EXCL,
 744                         S_IRWXU|S_IRWXG|S_IRWXO)) > 0) {
 745            /* truncate file to length PCI device's memory */
 746             if (ftruncate(fd, s->ivshmem_size) != 0) {
 747                 fprintf(stderr, "ivshmem: could not truncate shared file\n");
 748             }
 749
 750         } else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR,
 751                         S_IRWXU|S_IRWXG|S_IRWXO)) < 0) {
 752             fprintf(stderr, "ivshmem: could not open shared file\n");
 753             exit(-1);
 754
 755         }
 756
 757         if (check_shm_size(s, fd) == -1) {
 758             exit(-1);
 759         }
 760
 761         create_shared_memory_BAR(s, fd);
 762
 763     }
 764
 765     s->dev.config_write = ivshmem_write_config;
 766
 767     return 0;
 768 }
 769
 770 static void pci_ivshmem_uninit(PCIDevice *dev)
 771 {
 772     IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev);
 773
 774     if (s->migration_blocker) {
 775         migrate_del_blocker(s->migration_blocker);
 776         error_free(s->migration_blocker);
 777     }
 778
 779     memory_region_destroy(&s->ivshmem_mmio);
 780     memory_region_del_subregion(&s->bar, &s->ivshmem);
 781     vmstate_unregister_ram(&s->ivshmem, &s->dev.qdev);
 782     memory_region_destroy(&s->ivshmem);
 783     memory_region_destroy(&s->bar);
 784     unregister_savevm(&dev->qdev, "ivshmem", s);
 785 }
 786
 787 static Property ivshmem_properties[] = {
 788     DEFINE_PROP_CHR("chardev", IVShmemState, server_chr),
 789     DEFINE_PROP_STRING("size", IVShmemState, sizearg),
 790     DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1),
 791     DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD, false),
 792     DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true),
 793     DEFINE_PROP_STRING("shm", IVShmemState, shmobj),
 794     DEFINE_PROP_STRING("role", IVShmemState, role),
 795     DEFINE_PROP_UINT32("use64", IVShmemState, ivshmem_64bit, 1),
 796     DEFINE_PROP_END_OF_LIST(),
 797 };
 798
 799 static void ivshmem_class_init(ObjectClass *klass, void *data)
 800 {
 801     DeviceClass *dc = DEVICE_CLASS(klass);
 802     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 803
 804     k->init = pci_ivshmem_init;
 805     k->exit = pci_ivshmem_uninit;
 806     k->vendor_id = PCI_VENDOR_ID_IVSHMEM;
 807     k->device_id = PCI_DEVICE_ID_IVSHMEM;
 808     k->class_id = PCI_CLASS_MEMORY_RAM;
 809     dc->reset = ivshmem_reset;
 810     dc->props = ivshmem_properties;
 811 }
 812
 813 static const TypeInfo ivshmem_info = {
 814     .name          = "ivshmem",
 815     .parent        = TYPE_PCI_DEVICE,
 816     .instance_size = sizeof(IVShmemState),
 817     .class_init    = ivshmem_class_init,
 818 };
 819
 820 static void ivshmem_register_types(void)
 821 {
 822     type_register_static(&ivshmem_info);
 823 }
 824
 825 type_init(ivshmem_register_types)