hw/virtio-pci.c

   1 /*
   2  * Virtio PCI Bindings
   3  *
   4  * Copyright IBM, Corp. 2007
   5  * Copyright (c) 2009 CodeSourcery
   6  *
   7  * Authors:
   8  *  Anthony Liguori   <aliguori@us.ibm.com>
   9  *  Paul Brook        <paul@codesourcery.com>
  10  *
  11  * This work is licensed under the terms of the GNU GPL, version 2.  See
  12  * the COPYING file in the top-level directory.
  13  *
  14  * Contributions after 2012-01-13 are licensed under the terms of the
  15  * GNU GPL, version 2 or (at your option) any later version.
  16  */
  17
  18 #include <inttypes.h>
  19
  20 #include "virtio.h"
  21 #include "virtio-blk.h"
  22 #include "virtio-net.h"
  23 #include "virtio-serial.h"
  24 #include "virtio-scsi.h"
  25 #include "pci/pci.h"
  26 #include "qemu/error-report.h"
  27 #include "pci/msi.h"
  28 #include "pci/msix.h"
  29 #include "loader.h"
  30 #include "sysemu/kvm.h"
  31 #include "sysemu/blockdev.h"
  32 #include "virtio-pci.h"
  33 #include "qemu/range.h"
  34
  35 /* from Linux's linux/virtio_pci.h */
  36
  37 /* A 32-bit r/o bitmask of the features supported by the host */
  38 #define VIRTIO_PCI_HOST_FEATURES        0
  39
  40 /* A 32-bit r/w bitmask of features activated by the guest */
  41 #define VIRTIO_PCI_GUEST_FEATURES       4
  42
  43 /* A 32-bit r/w PFN for the currently selected queue */
  44 #define VIRTIO_PCI_QUEUE_PFN            8
  45
  46 /* A 16-bit r/o queue size for the currently selected queue */
  47 #define VIRTIO_PCI_QUEUE_NUM            12
  48
  49 /* A 16-bit r/w queue selector */
  50 #define VIRTIO_PCI_QUEUE_SEL            14
  51
  52 /* A 16-bit r/w queue notifier */
  53 #define VIRTIO_PCI_QUEUE_NOTIFY         16
  54
  55 /* An 8-bit device status register.  */
  56 #define VIRTIO_PCI_STATUS               18
  57
  58 /* An 8-bit r/o interrupt status register.  Reading the value will return the
  59  * current contents of the ISR and will also clear it.  This is effectively
  60  * a read-and-acknowledge. */
  61 #define VIRTIO_PCI_ISR                  19
  62
  63 /* MSI-X registers: only enabled if MSI-X is enabled. */
  64 /* A 16-bit vector for configuration changes. */
  65 #define VIRTIO_MSI_CONFIG_VECTOR        20
  66 /* A 16-bit vector for selected queue notifications. */
  67 #define VIRTIO_MSI_QUEUE_VECTOR         22
  68
  69 /* Config space size */
  70 #define VIRTIO_PCI_CONFIG_NOMSI         20
  71 #define VIRTIO_PCI_CONFIG_MSI           24
  72 #define VIRTIO_PCI_REGION_SIZE(dev)     (msix_present(dev) ? \
  73                                          VIRTIO_PCI_CONFIG_MSI : \
  74                                          VIRTIO_PCI_CONFIG_NOMSI)
  75
  76 /* The remaining space is defined by each driver as the per-driver
  77  * configuration space */
  78 #define VIRTIO_PCI_CONFIG(dev)          (msix_enabled(dev) ? \
  79                                          VIRTIO_PCI_CONFIG_MSI : \
  80                                          VIRTIO_PCI_CONFIG_NOMSI)
  81
  82 /* How many bits to shift physical queue address written to QUEUE_PFN.
  83  * 12 is historical, and due to x86 page size. */
  84 #define VIRTIO_PCI_QUEUE_ADDR_SHIFT    12
  85
  86 /* Flags track per-device state like workarounds for quirks in older guests. */
  87 #define VIRTIO_PCI_FLAG_BUS_MASTER_BUG  (1 << 0)
  88
  89 /* QEMU doesn't strictly need write barriers since everything runs in
  90  * lock-step.  We'll leave the calls to wmb() in though to make it obvious for
  91  * KVM or if kqemu gets SMP support.
  92  */
  93 #define wmb() do { } while (0)
  94
  95 /* HACK for virtio to determine if it's running a big endian guest */
  96 bool virtio_is_big_endian(void);
  97
  98 /* virtio device */
  99
 100 static void virtio_pci_notify(void *opaque, uint16_t vector)
 101 {
 102     VirtIOPCIProxy *proxy = opaque;
 103     if (msix_enabled(&proxy->pci_dev))
 104         msix_notify(&proxy->pci_dev, vector);
 105     else
 106         qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
 107 }
 108
 109 static void virtio_pci_save_config(void * opaque, QEMUFile *f)
 110 {
 111     VirtIOPCIProxy *proxy = opaque;
 112     pci_device_save(&proxy->pci_dev, f);
 113     msix_save(&proxy->pci_dev, f);
 114     if (msix_present(&proxy->pci_dev))
 115         qemu_put_be16(f, proxy->vdev->config_vector);
 116 }
 117
 118 static void virtio_pci_save_queue(void * opaque, int n, QEMUFile *f)
 119 {
 120     VirtIOPCIProxy *proxy = opaque;
 121     if (msix_present(&proxy->pci_dev))
 122         qemu_put_be16(f, virtio_queue_vector(proxy->vdev, n));
 123 }
 124
 125 static int virtio_pci_load_config(void * opaque, QEMUFile *f)
 126 {
 127     VirtIOPCIProxy *proxy = opaque;
 128     int ret;
 129     ret = pci_device_load(&proxy->pci_dev, f);
 130     if (ret) {
 131         return ret;
 132     }
 133     msix_unuse_all_vectors(&proxy->pci_dev);
 134     msix_load(&proxy->pci_dev, f);
 135     if (msix_present(&proxy->pci_dev)) {
 136         qemu_get_be16s(f, &proxy->vdev->config_vector);
 137     } else {
 138         proxy->vdev->config_vector = VIRTIO_NO_VECTOR;
 139     }
 140     if (proxy->vdev->config_vector != VIRTIO_NO_VECTOR) {
 141         return msix_vector_use(&proxy->pci_dev, proxy->vdev->config_vector);
 142     }
 143     return 0;
 144 }
 145
 146 static int virtio_pci_load_queue(void * opaque, int n, QEMUFile *f)
 147 {
 148     VirtIOPCIProxy *proxy = opaque;
 149     uint16_t vector;
 150     if (msix_present(&proxy->pci_dev)) {
 151         qemu_get_be16s(f, &vector);
 152     } else {
 153         vector = VIRTIO_NO_VECTOR;
 154     }
 155     virtio_queue_set_vector(proxy->vdev, n, vector);
 156     if (vector != VIRTIO_NO_VECTOR) {
 157         return msix_vector_use(&proxy->pci_dev, vector);
 158     }
 159     return 0;
 160 }
 161
 162 static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy,
 163                                                  int n, bool assign, bool set_handler)
 164 {
 165     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 166     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
 167     int r = 0;
 168
 169     if (assign) {
 170         r = event_notifier_init(notifier, 1);
 171         if (r < 0) {
 172             error_report("%s: unable to init event notifier: %d",
 173                          __func__, r);
 174             return r;
 175         }
 176         virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
 177         memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 178                                   true, n, notifier);
 179     } else {
 180         memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 181                                   true, n, notifier);
 182         virtio_queue_set_host_notifier_fd_handler(vq, false, false);
 183         event_notifier_cleanup(notifier);
 184     }
 185     return r;
 186 }
 187
 188 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
 189 {
 190     int n, r;
 191
 192     if (!(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) ||
 193         proxy->ioeventfd_disabled ||
 194         proxy->ioeventfd_started) {
 195         return;
 196     }
 197
 198     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 199         if (!virtio_queue_get_num(proxy->vdev, n)) {
 200             continue;
 201         }
 202
 203         r = virtio_pci_set_host_notifier_internal(proxy, n, true, true);
 204         if (r < 0) {
 205             goto assign_error;
 206         }
 207     }
 208     proxy->ioeventfd_started = true;
 209     return;
 210
 211 assign_error:
 212     while (--n >= 0) {
 213         if (!virtio_queue_get_num(proxy->vdev, n)) {
 214             continue;
 215         }
 216
 217         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 218         assert(r >= 0);
 219     }
 220     proxy->ioeventfd_started = false;
 221     error_report("%s: failed. Fallback to a userspace (slower).", __func__);
 222 }
 223
 224 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
 225 {
 226     int r;
 227     int n;
 228
 229     if (!proxy->ioeventfd_started) {
 230         return;
 231     }
 232
 233     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 234         if (!virtio_queue_get_num(proxy->vdev, n)) {
 235             continue;
 236         }
 237
 238         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 239         assert(r >= 0);
 240     }
 241     proxy->ioeventfd_started = false;
 242 }
 243
 244 void virtio_pci_reset(DeviceState *d)
 245 {
 246     VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 247     virtio_pci_stop_ioeventfd(proxy);
 248     virtio_reset(proxy->vdev);
 249     msix_unuse_all_vectors(&proxy->pci_dev);
 250     proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 251 }
 252
 253 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 254 {
 255     VirtIOPCIProxy *proxy = opaque;
 256     VirtIODevice *vdev = proxy->vdev;
 257     hwaddr pa;
 258
 259     switch (addr) {
 260     case VIRTIO_PCI_GUEST_FEATURES:
 261         /* Guest does not negotiate properly?  We have to assume nothing. */
 262         if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
 263             val = vdev->bad_features ? vdev->bad_features(vdev) : 0;
 264         }
 265         virtio_set_features(vdev, val);
 266         break;
 267     case VIRTIO_PCI_QUEUE_PFN:
 268         pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 269         if (pa == 0) {
 270             virtio_pci_stop_ioeventfd(proxy);
 271             virtio_reset(proxy->vdev);
 272             msix_unuse_all_vectors(&proxy->pci_dev);
 273         }
 274         else
 275             virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
 276         break;
 277     case VIRTIO_PCI_QUEUE_SEL:
 278         if (val < VIRTIO_PCI_QUEUE_MAX)
 279             vdev->queue_sel = val;
 280         break;
 281     case VIRTIO_PCI_QUEUE_NOTIFY:
 282         if (val < VIRTIO_PCI_QUEUE_MAX) {
 283             virtio_queue_notify(vdev, val);
 284         }
 285         break;
 286     case VIRTIO_PCI_STATUS:
 287         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
 288             virtio_pci_stop_ioeventfd(proxy);
 289         }
 290
 291         virtio_set_status(vdev, val & 0xFF);
 292
 293         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
 294             virtio_pci_start_ioeventfd(proxy);
 295         }
 296
 297         if (vdev->status == 0) {
 298             virtio_reset(proxy->vdev);
 299             msix_unuse_all_vectors(&proxy->pci_dev);
 300         }
 301
 302         /* Linux before 2.6.34 sets the device as OK without enabling
 303            the PCI device bus master bit. In this case we need to disable
 304            some safety checks. */
 305         if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
 306             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 307             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 308         }
 309         break;
 310     case VIRTIO_MSI_CONFIG_VECTOR:
 311         msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
 312         /* Make it possible for guest to discover an error took place. */
 313         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 314             val = VIRTIO_NO_VECTOR;
 315         vdev->config_vector = val;
 316         break;
 317     case VIRTIO_MSI_QUEUE_VECTOR:
 318         msix_vector_unuse(&proxy->pci_dev,
 319                           virtio_queue_vector(vdev, vdev->queue_sel));
 320         /* Make it possible for guest to discover an error took place. */
 321         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 322             val = VIRTIO_NO_VECTOR;
 323         virtio_queue_set_vector(vdev, vdev->queue_sel, val);
 324         break;
 325     default:
 326         error_report("%s: unexpected address 0x%x value 0x%x",
 327                      __func__, addr, val);
 328         break;
 329     }
 330 }
 331
 332 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
 333 {
 334     VirtIODevice *vdev = proxy->vdev;
 335     uint32_t ret = 0xFFFFFFFF;
 336
 337     switch (addr) {
 338     case VIRTIO_PCI_HOST_FEATURES:
 339         ret = proxy->host_features;
 340         break;
 341     case VIRTIO_PCI_GUEST_FEATURES:
 342         ret = vdev->guest_features;
 343         break;
 344     case VIRTIO_PCI_QUEUE_PFN:
 345         ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
 346               >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 347         break;
 348     case VIRTIO_PCI_QUEUE_NUM:
 349         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
 350         break;
 351     case VIRTIO_PCI_QUEUE_SEL:
 352         ret = vdev->queue_sel;
 353         break;
 354     case VIRTIO_PCI_STATUS:
 355         ret = vdev->status;
 356         break;
 357     case VIRTIO_PCI_ISR:
 358         /* reading from the ISR also clears it. */
 359         ret = vdev->isr;
 360         vdev->isr = 0;
 361         qemu_set_irq(proxy->pci_dev.irq[0], 0);
 362         break;
 363     case VIRTIO_MSI_CONFIG_VECTOR:
 364         ret = vdev->config_vector;
 365         break;
 366     case VIRTIO_MSI_QUEUE_VECTOR:
 367         ret = virtio_queue_vector(vdev, vdev->queue_sel);
 368         break;
 369     default:
 370         break;
 371     }
 372
 373     return ret;
 374 }
 375
 376 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
 377                                        unsigned size)
 378 {
 379     VirtIOPCIProxy *proxy = opaque;
 380     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 381     uint64_t val = 0;
 382     if (addr < config) {
 383         return virtio_ioport_read(proxy, addr);
 384     }
 385     addr -= config;
 386
 387     switch (size) {
 388     case 1:
 389         val = virtio_config_readb(proxy->vdev, addr);
 390         break;
 391     case 2:
 392         val = virtio_config_readw(proxy->vdev, addr);
 393         if (virtio_is_big_endian()) {
 394             val = bswap16(val);
 395         }
 396         break;
 397     case 4:
 398         val = virtio_config_readl(proxy->vdev, addr);
 399         if (virtio_is_big_endian()) {
 400             val = bswap32(val);
 401         }
 402         break;
 403     }
 404     return val;
 405 }
 406
 407 static void virtio_pci_config_write(void *opaque, hwaddr addr,
 408                                     uint64_t val, unsigned size)
 409 {
 410     VirtIOPCIProxy *proxy = opaque;
 411     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 412     if (addr < config) {
 413         virtio_ioport_write(proxy, addr, val);
 414         return;
 415     }
 416     addr -= config;
 417     /*
 418      * Virtio-PCI is odd. Ioports are LE but config space is target native
 419      * endian.
 420      */
 421     switch (size) {
 422     case 1:
 423         virtio_config_writeb(proxy->vdev, addr, val);
 424         break;
 425     case 2:
 426         if (virtio_is_big_endian()) {
 427             val = bswap16(val);
 428         }
 429         virtio_config_writew(proxy->vdev, addr, val);
 430         break;
 431     case 4:
 432         if (virtio_is_big_endian()) {
 433             val = bswap32(val);
 434         }
 435         virtio_config_writel(proxy->vdev, addr, val);
 436         break;
 437     }
 438 }
 439
 440 static const MemoryRegionOps virtio_pci_config_ops = {
 441     .read = virtio_pci_config_read,
 442     .write = virtio_pci_config_write,
 443     .impl = {
 444         .min_access_size = 1,
 445         .max_access_size = 4,
 446     },
 447     .endianness = DEVICE_LITTLE_ENDIAN,
 448 };
 449
 450 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 451                                 uint32_t val, int len)
 452 {
 453     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 454
 455     pci_default_write_config(pci_dev, address, val, len);
 456
 457     if (range_covers_byte(address, len, PCI_COMMAND) &&
 458         !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER) &&
 459         !(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
 460         virtio_pci_stop_ioeventfd(proxy);
 461         virtio_set_status(proxy->vdev,
 462                           proxy->vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
 463     }
 464 }
 465
 466 static unsigned virtio_pci_get_features(void *opaque)
 467 {
 468     VirtIOPCIProxy *proxy = opaque;
 469     return proxy->host_features;
 470 }
 471
 472 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
 473                                         unsigned int queue_no,
 474                                         unsigned int vector,
 475                                         MSIMessage msg)
 476 {
 477     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 478     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 479     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 480     int ret;
 481
 482     if (irqfd->users == 0) {
 483         ret = kvm_irqchip_add_msi_route(kvm_state, msg);
 484         if (ret < 0) {
 485             return ret;
 486         }
 487         irqfd->virq = ret;
 488     }
 489     irqfd->users++;
 490
 491     ret = kvm_irqchip_add_irqfd_notifier(kvm_state, n, irqfd->virq);
 492     if (ret < 0) {
 493         if (--irqfd->users == 0) {
 494             kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 495         }
 496         return ret;
 497     }
 498
 499     virtio_queue_set_guest_notifier_fd_handler(vq, true, true);
 500     return 0;
 501 }
 502
 503 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
 504                                              unsigned int queue_no,
 505                                              unsigned int vector)
 506 {
 507     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 508     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 509     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 510     int ret;
 511
 512     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, n, irqfd->virq);
 513     assert(ret == 0);
 514
 515     if (--irqfd->users == 0) {
 516         kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 517     }
 518
 519     virtio_queue_set_guest_notifier_fd_handler(vq, true, false);
 520 }
 521
 522 static int kvm_virtio_pci_vector_use(PCIDevice *dev, unsigned vector,
 523                                      MSIMessage msg)
 524 {
 525     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 526     VirtIODevice *vdev = proxy->vdev;
 527     int ret, queue_no;
 528
 529     for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) {
 530         if (!virtio_queue_get_num(vdev, queue_no)) {
 531             break;
 532         }
 533         if (virtio_queue_vector(vdev, queue_no) != vector) {
 534             continue;
 535         }
 536         ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector, msg);
 537         if (ret < 0) {
 538             goto undo;
 539         }
 540     }
 541     return 0;
 542
 543 undo:
 544     while (--queue_no >= 0) {
 545         if (virtio_queue_vector(vdev, queue_no) != vector) {
 546             continue;
 547         }
 548         kvm_virtio_pci_vq_vector_release(proxy, queue_no, vector);
 549     }
 550     return ret;
 551 }
 552
 553 static void kvm_virtio_pci_vector_release(PCIDevice *dev, unsigned vector)
 554 {
 555     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 556     VirtIODevice *vdev = proxy->vdev;
 557     int queue_no;
 558
 559     for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) {
 560         if (!virtio_queue_get_num(vdev, queue_no)) {
 561             break;
 562         }
 563         if (virtio_queue_vector(vdev, queue_no) != vector) {
 564             continue;
 565         }
 566         kvm_virtio_pci_vq_vector_release(proxy, queue_no, vector);
 567     }
 568 }
 569
 570 static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign)
 571 {
 572     VirtIOPCIProxy *proxy = opaque;
 573     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 574     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 575
 576     if (assign) {
 577         int r = event_notifier_init(notifier, 0);
 578         if (r < 0) {
 579             return r;
 580         }
 581         virtio_queue_set_guest_notifier_fd_handler(vq, true, false);
 582     } else {
 583         virtio_queue_set_guest_notifier_fd_handler(vq, false, false);
 584         event_notifier_cleanup(notifier);
 585     }
 586
 587     return 0;
 588 }
 589
 590 static bool virtio_pci_query_guest_notifiers(void *opaque)
 591 {
 592     VirtIOPCIProxy *proxy = opaque;
 593     return msix_enabled(&proxy->pci_dev);
 594 }
 595
 596 static int virtio_pci_set_guest_notifiers(void *opaque, bool assign)
 597 {
 598     VirtIOPCIProxy *proxy = opaque;
 599     VirtIODevice *vdev = proxy->vdev;
 600     int r, n;
 601
 602     /* Must unset vector notifier while guest notifier is still assigned */
 603     if (kvm_msi_via_irqfd_enabled() && !assign) {
 604         msix_unset_vector_notifiers(&proxy->pci_dev);
 605         g_free(proxy->vector_irqfd);
 606         proxy->vector_irqfd = NULL;
 607     }
 608
 609     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 610         if (!virtio_queue_get_num(vdev, n)) {
 611             break;
 612         }
 613
 614         r = virtio_pci_set_guest_notifier(opaque, n, assign);
 615         if (r < 0) {
 616             goto assign_error;
 617         }
 618     }
 619
 620     /* Must set vector notifier after guest notifier has been assigned */
 621     if (kvm_msi_via_irqfd_enabled() && assign) {
 622         proxy->vector_irqfd =
 623             g_malloc0(sizeof(*proxy->vector_irqfd) *
 624                       msix_nr_vectors_allocated(&proxy->pci_dev));
 625         r = msix_set_vector_notifiers(&proxy->pci_dev,
 626                                       kvm_virtio_pci_vector_use,
 627                                       kvm_virtio_pci_vector_release);
 628         if (r < 0) {
 629             goto assign_error;
 630         }
 631     }
 632
 633     return 0;
 634
 635 assign_error:
 636     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
 637     assert(assign);
 638     while (--n >= 0) {
 639         virtio_pci_set_guest_notifier(opaque, n, !assign);
 640     }
 641     return r;
 642 }
 643
 644 static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign)
 645 {
 646     VirtIOPCIProxy *proxy = opaque;
 647
 648     /* Stop using ioeventfd for virtqueue kick if the device starts using host
 649      * notifiers.  This makes it easy to avoid stepping on each others' toes.
 650      */
 651     proxy->ioeventfd_disabled = assign;
 652     if (assign) {
 653         virtio_pci_stop_ioeventfd(proxy);
 654     }
 655     /* We don't need to start here: it's not needed because backend
 656      * currently only stops on status change away from ok,
 657      * reset, vmstop and such. If we do add code to start here,
 658      * need to check vmstate, device state etc. */
 659     return virtio_pci_set_host_notifier_internal(proxy, n, assign, false);
 660 }
 661
 662 static void virtio_pci_vmstate_change(void *opaque, bool running)
 663 {
 664     VirtIOPCIProxy *proxy = opaque;
 665
 666     if (running) {
 667         /* Try to find out if the guest has bus master disabled, but is
 668            in ready state. Then we have a buggy guest OS. */
 669         if ((proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
 670             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 671             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 672         }
 673         virtio_pci_start_ioeventfd(proxy);
 674     } else {
 675         virtio_pci_stop_ioeventfd(proxy);
 676     }
 677 }
 678
 679 static const VirtIOBindings virtio_pci_bindings = {
 680     .notify = virtio_pci_notify,
 681     .save_config = virtio_pci_save_config,
 682     .load_config = virtio_pci_load_config,
 683     .save_queue = virtio_pci_save_queue,
 684     .load_queue = virtio_pci_load_queue,
 685     .get_features = virtio_pci_get_features,
 686     .query_guest_notifiers = virtio_pci_query_guest_notifiers,
 687     .set_host_notifier = virtio_pci_set_host_notifier,
 688     .set_guest_notifiers = virtio_pci_set_guest_notifiers,
 689     .vmstate_change = virtio_pci_vmstate_change,
 690 };
 691
 692 void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev)
 693 {
 694     uint8_t *config;
 695     uint32_t size;
 696
 697     proxy->vdev = vdev;
 698
 699     config = proxy->pci_dev.config;
 700
 701     if (proxy->class_code) {
 702         pci_config_set_class(config, proxy->class_code);
 703     }
 704     pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
 705                  pci_get_word(config + PCI_VENDOR_ID));
 706     pci_set_word(config + PCI_SUBSYSTEM_ID, vdev->device_id);
 707     config[PCI_INTERRUPT_PIN] = 1;
 708
 709     if (vdev->nvectors &&
 710         msix_init_exclusive_bar(&proxy->pci_dev, vdev->nvectors, 1)) {
 711         vdev->nvectors = 0;
 712     }
 713
 714     proxy->pci_dev.config_write = virtio_write_config;
 715
 716     size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len;
 717     if (size & (size-1))
 718         size = 1 << qemu_fls(size);
 719
 720     memory_region_init_io(&proxy->bar, &virtio_pci_config_ops, proxy,
 721                           "virtio-pci", size);
 722     pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
 723                      &proxy->bar);
 724
 725     if (!kvm_has_many_ioeventfds()) {
 726         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
 727     }
 728
 729     virtio_bind_device(vdev, &virtio_pci_bindings, proxy);
 730     proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
 731     proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
 732     proxy->host_features = vdev->get_features(vdev, proxy->host_features);
 733 }
 734
 735 static int virtio_blk_init_pci(PCIDevice *pci_dev)
 736 {
 737     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 738     VirtIODevice *vdev;
 739
 740     if (proxy->class_code != PCI_CLASS_STORAGE_SCSI &&
 741         proxy->class_code != PCI_CLASS_STORAGE_OTHER)
 742         proxy->class_code = PCI_CLASS_STORAGE_SCSI;
 743
 744     vdev = virtio_blk_init(&pci_dev->qdev, &proxy->blk);
 745     if (!vdev) {
 746         return -1;
 747     }
 748     vdev->nvectors = proxy->nvectors;
 749     virtio_init_pci(proxy, vdev);
 750     /* make the actual value visible */
 751     proxy->nvectors = vdev->nvectors;
 752     return 0;
 753 }
 754
 755 static void virtio_exit_pci(PCIDevice *pci_dev)
 756 {
 757     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 758
 759     memory_region_destroy(&proxy->bar);
 760     msix_uninit_exclusive_bar(pci_dev);
 761 }
 762
 763 static void virtio_blk_exit_pci(PCIDevice *pci_dev)
 764 {
 765     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 766
 767     virtio_pci_stop_ioeventfd(proxy);
 768     virtio_blk_exit(proxy->vdev);
 769     virtio_exit_pci(pci_dev);
 770 }
 771
 772 static int virtio_serial_init_pci(PCIDevice *pci_dev)
 773 {
 774     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 775     VirtIODevice *vdev;
 776
 777     if (proxy->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
 778         proxy->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
 779         proxy->class_code != PCI_CLASS_OTHERS)          /* qemu-kvm  */
 780         proxy->class_code = PCI_CLASS_COMMUNICATION_OTHER;
 781
 782     vdev = virtio_serial_init(&pci_dev->qdev, &proxy->serial);
 783     if (!vdev) {
 784         return -1;
 785     }
 786     vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED
 787                                         ? proxy->serial.max_virtserial_ports + 1
 788                                         : proxy->nvectors;
 789     virtio_init_pci(proxy, vdev);
 790     proxy->nvectors = vdev->nvectors;
 791     return 0;
 792 }
 793
 794 static void virtio_serial_exit_pci(PCIDevice *pci_dev)
 795 {
 796     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 797
 798     virtio_pci_stop_ioeventfd(proxy);
 799     virtio_serial_exit(proxy->vdev);
 800     virtio_exit_pci(pci_dev);
 801 }
 802
 803 static int virtio_net_init_pci(PCIDevice *pci_dev)
 804 {
 805     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 806     VirtIODevice *vdev;
 807
 808     vdev = virtio_net_init(&pci_dev->qdev, &proxy->nic, &proxy->net);
 809
 810     vdev->nvectors = proxy->nvectors;
 811     virtio_init_pci(proxy, vdev);
 812
 813     /* make the actual value visible */
 814     proxy->nvectors = vdev->nvectors;
 815     return 0;
 816 }
 817
 818 static void virtio_net_exit_pci(PCIDevice *pci_dev)
 819 {
 820     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 821
 822     virtio_pci_stop_ioeventfd(proxy);
 823     virtio_net_exit(proxy->vdev);
 824     virtio_exit_pci(pci_dev);
 825 }
 826
 827 static int virtio_balloon_init_pci(PCIDevice *pci_dev)
 828 {
 829     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 830     VirtIODevice *vdev;
 831
 832     if (proxy->class_code != PCI_CLASS_OTHERS &&
 833         proxy->class_code != PCI_CLASS_MEMORY_RAM) { /* qemu < 1.1 */
 834         proxy->class_code = PCI_CLASS_OTHERS;
 835     }
 836
 837     vdev = virtio_balloon_init(&pci_dev->qdev);
 838     if (!vdev) {
 839         return -1;
 840     }
 841     virtio_init_pci(proxy, vdev);
 842     return 0;
 843 }
 844
 845 static void virtio_balloon_exit_pci(PCIDevice *pci_dev)
 846 {
 847     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 848
 849     virtio_pci_stop_ioeventfd(proxy);
 850     virtio_balloon_exit(proxy->vdev);
 851     virtio_exit_pci(pci_dev);
 852 }
 853
 854 static int virtio_rng_init_pci(PCIDevice *pci_dev)
 855 {
 856     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 857     VirtIODevice *vdev;
 858
 859     if (proxy->rng.rng == NULL) {
 860         proxy->rng.default_backend = RNG_RANDOM(object_new(TYPE_RNG_RANDOM));
 861
 862         object_property_add_child(OBJECT(pci_dev),
 863                                   "default-backend",
 864                                   OBJECT(proxy->rng.default_backend),
 865                                   NULL);
 866
 867         object_property_set_link(OBJECT(pci_dev),
 868                                  OBJECT(proxy->rng.default_backend),
 869                                  "rng", NULL);
 870     }
 871
 872     vdev = virtio_rng_init(&pci_dev->qdev, &proxy->rng);
 873     if (!vdev) {
 874         return -1;
 875     }
 876     virtio_init_pci(proxy, vdev);
 877     return 0;
 878 }
 879
 880 static void virtio_rng_exit_pci(PCIDevice *pci_dev)
 881 {
 882     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 883
 884     virtio_pci_stop_ioeventfd(proxy);
 885     virtio_rng_exit(proxy->vdev);
 886     virtio_exit_pci(pci_dev);
 887 }
 888
 889 static Property virtio_blk_properties[] = {
 890     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
 891     DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, blk.conf),
 892     DEFINE_BLOCK_CHS_PROPERTIES(VirtIOPCIProxy, blk.conf),
 893     DEFINE_PROP_STRING("serial", VirtIOPCIProxy, blk.serial),
 894 #ifdef __linux__
 895     DEFINE_PROP_BIT("scsi", VirtIOPCIProxy, blk.scsi, 0, true),
 896 #endif
 897     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
 898     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
 899     DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features),
 900     DEFINE_PROP_END_OF_LIST(),
 901 };
 902
 903 static void virtio_blk_class_init(ObjectClass *klass, void *data)
 904 {
 905     DeviceClass *dc = DEVICE_CLASS(klass);
 906     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 907
 908     k->init = virtio_blk_init_pci;
 909     k->exit = virtio_blk_exit_pci;
 910     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 911     k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
 912     k->revision = VIRTIO_PCI_ABI_VERSION;
 913     k->class_id = PCI_CLASS_STORAGE_SCSI;
 914     dc->reset = virtio_pci_reset;
 915     dc->props = virtio_blk_properties;
 916 }
 917
 918 static TypeInfo virtio_blk_info = {
 919     .name          = "virtio-blk-pci",
 920     .parent        = TYPE_PCI_DEVICE,
 921     .instance_size = sizeof(VirtIOPCIProxy),
 922     .class_init    = virtio_blk_class_init,
 923 };
 924
 925 static Property virtio_net_properties[] = {
 926     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
 927     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
 928     DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features),
 929     DEFINE_NIC_PROPERTIES(VirtIOPCIProxy, nic),
 930     DEFINE_PROP_UINT32("x-txtimer", VirtIOPCIProxy, net.txtimer, TX_TIMER_INTERVAL),
 931     DEFINE_PROP_INT32("x-txburst", VirtIOPCIProxy, net.txburst, TX_BURST),
 932     DEFINE_PROP_STRING("tx", VirtIOPCIProxy, net.tx),
 933     DEFINE_PROP_END_OF_LIST(),
 934 };
 935
 936 static void virtio_net_class_init(ObjectClass *klass, void *data)
 937 {
 938     DeviceClass *dc = DEVICE_CLASS(klass);
 939     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 940
 941     k->init = virtio_net_init_pci;
 942     k->exit = virtio_net_exit_pci;
 943     k->romfile = "pxe-virtio.rom";
 944     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 945     k->device_id = PCI_DEVICE_ID_VIRTIO_NET;
 946     k->revision = VIRTIO_PCI_ABI_VERSION;
 947     k->class_id = PCI_CLASS_NETWORK_ETHERNET;
 948     dc->reset = virtio_pci_reset;
 949     dc->props = virtio_net_properties;
 950 }
 951
 952 static TypeInfo virtio_net_info = {
 953     .name          = "virtio-net-pci",
 954     .parent        = TYPE_PCI_DEVICE,
 955     .instance_size = sizeof(VirtIOPCIProxy),
 956     .class_init    = virtio_net_class_init,
 957 };
 958
 959 static Property virtio_serial_properties[] = {
 960     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
 961     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, DEV_NVECTORS_UNSPECIFIED),
 962     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
 963     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
 964     DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, serial.max_virtserial_ports, 31),
 965     DEFINE_PROP_END_OF_LIST(),
 966 };
 967
 968 static void virtio_serial_class_init(ObjectClass *klass, void *data)
 969 {
 970     DeviceClass *dc = DEVICE_CLASS(klass);
 971     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 972
 973     k->init = virtio_serial_init_pci;
 974     k->exit = virtio_serial_exit_pci;
 975     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 976     k->device_id = PCI_DEVICE_ID_VIRTIO_CONSOLE;
 977     k->revision = VIRTIO_PCI_ABI_VERSION;
 978     k->class_id = PCI_CLASS_COMMUNICATION_OTHER;
 979     dc->reset = virtio_pci_reset;
 980     dc->props = virtio_serial_properties;
 981 }
 982
 983 static TypeInfo virtio_serial_info = {
 984     .name          = "virtio-serial-pci",
 985     .parent        = TYPE_PCI_DEVICE,
 986     .instance_size = sizeof(VirtIOPCIProxy),
 987     .class_init    = virtio_serial_class_init,
 988 };
 989
 990 static Property virtio_balloon_properties[] = {
 991     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
 992     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
 993     DEFINE_PROP_END_OF_LIST(),
 994 };
 995
 996 static void virtio_balloon_class_init(ObjectClass *klass, void *data)
 997 {
 998     DeviceClass *dc = DEVICE_CLASS(klass);
 999     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1000
1001     k->init = virtio_balloon_init_pci;
1002     k->exit = virtio_balloon_exit_pci;
1003     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1004     k->device_id = PCI_DEVICE_ID_VIRTIO_BALLOON;
1005     k->revision = VIRTIO_PCI_ABI_VERSION;
1006     k->class_id = PCI_CLASS_OTHERS;
1007     dc->reset = virtio_pci_reset;
1008     dc->props = virtio_balloon_properties;
1009 }
1010
1011 static TypeInfo virtio_balloon_info = {
1012     .name          = "virtio-balloon-pci",
1013     .parent        = TYPE_PCI_DEVICE,
1014     .instance_size = sizeof(VirtIOPCIProxy),
1015     .class_init    = virtio_balloon_class_init,
1016 };
1017
1018 static void virtio_rng_initfn(Object *obj)
1019 {
1020     PCIDevice *pci_dev = PCI_DEVICE(obj);
1021     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1022
1023     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
1024                              (Object **)&proxy->rng.rng, NULL);
1025 }
1026
1027 static Property virtio_rng_properties[] = {
1028     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1029     /* Set a default rate limit of 2^47 bytes per minute or roughly 2TB/s.  If
1030        you have an entropy source capable of generating more entropy than this
1031        and you can pass it through via virtio-rng, then hats off to you.  Until
1032        then, this is unlimited for all practical purposes.
1033     */
1034     DEFINE_PROP_UINT64("max-bytes", VirtIOPCIProxy, rng.max_bytes, INT64_MAX),
1035     DEFINE_PROP_UINT32("period", VirtIOPCIProxy, rng.period_ms, 1 << 16),
1036     DEFINE_PROP_END_OF_LIST(),
1037 };
1038
1039 static void virtio_rng_class_init(ObjectClass *klass, void *data)
1040 {
1041     DeviceClass *dc = DEVICE_CLASS(klass);
1042     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1043
1044     k->init = virtio_rng_init_pci;
1045     k->exit = virtio_rng_exit_pci;
1046     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1047     k->device_id = PCI_DEVICE_ID_VIRTIO_RNG;
1048     k->revision = VIRTIO_PCI_ABI_VERSION;
1049     k->class_id = PCI_CLASS_OTHERS;
1050     dc->reset = virtio_pci_reset;
1051     dc->props = virtio_rng_properties;
1052 }
1053
1054 static TypeInfo virtio_rng_info = {
1055     .name          = "virtio-rng-pci",
1056     .parent        = TYPE_PCI_DEVICE,
1057     .instance_size = sizeof(VirtIOPCIProxy),
1058     .instance_init = virtio_rng_initfn,
1059     .class_init    = virtio_rng_class_init,
1060 };
1061
1062 static int virtio_scsi_init_pci(PCIDevice *pci_dev)
1063 {
1064     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1065     VirtIODevice *vdev;
1066
1067     vdev = virtio_scsi_init(&pci_dev->qdev, &proxy->scsi);
1068     if (!vdev) {
1069         return -EINVAL;
1070     }
1071
1072     vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED
1073                                         ? proxy->scsi.num_queues + 3
1074                                         : proxy->nvectors;
1075     virtio_init_pci(proxy, vdev);
1076
1077     /* make the actual value visible */
1078     proxy->nvectors = vdev->nvectors;
1079     return 0;
1080 }
1081
1082 static void virtio_scsi_exit_pci(PCIDevice *pci_dev)
1083 {
1084     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1085
1086     virtio_scsi_exit(proxy->vdev);
1087     virtio_exit_pci(pci_dev);
1088 }
1089
1090 static Property virtio_scsi_properties[] = {
1091     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1092     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, DEV_NVECTORS_UNSPECIFIED),
1093     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOPCIProxy, host_features, scsi),
1094     DEFINE_PROP_END_OF_LIST(),
1095 };
1096
1097 static void virtio_scsi_class_init(ObjectClass *klass, void *data)
1098 {
1099     DeviceClass *dc = DEVICE_CLASS(klass);
1100     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1101
1102     k->init = virtio_scsi_init_pci;
1103     k->exit = virtio_scsi_exit_pci;
1104     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1105     k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1106     k->revision = 0x00;
1107     k->class_id = PCI_CLASS_STORAGE_SCSI;
1108     dc->reset = virtio_pci_reset;
1109     dc->props = virtio_scsi_properties;
1110 }
1111
1112 static TypeInfo virtio_scsi_info = {
1113     .name          = "virtio-scsi-pci",
1114     .parent        = TYPE_PCI_DEVICE,
1115     .instance_size = sizeof(VirtIOPCIProxy),
1116     .class_init    = virtio_scsi_class_init,
1117 };
1118
1119 static void virtio_pci_register_types(void)
1120 {
1121     type_register_static(&virtio_blk_info);
1122     type_register_static(&virtio_net_info);
1123     type_register_static(&virtio_serial_info);
1124     type_register_static(&virtio_balloon_info);
1125     type_register_static(&virtio_scsi_info);
1126     type_register_static(&virtio_rng_info);
1127 }
1128
1129 type_init(virtio_pci_register_types)