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.h"
  26 #include "qemu-error.h"
  27 #include "msi.h"
  28 #include "msix.h"
  29 #include "net.h"
  30 #include "loader.h"
  31 #include "kvm.h"
  32 #include "blockdev.h"
  33 #include "virtio-pci.h"
  34 #include "range.h"
  35
  36 /* from Linux's linux/virtio_pci.h */
  37
  38 /* A 32-bit r/o bitmask of the features supported by the host */
  39 #define VIRTIO_PCI_HOST_FEATURES        0
  40
  41 /* A 32-bit r/w bitmask of features activated by the guest */
  42 #define VIRTIO_PCI_GUEST_FEATURES       4
  43
  44 /* A 32-bit r/w PFN for the currently selected queue */
  45 #define VIRTIO_PCI_QUEUE_PFN            8
  46
  47 /* A 16-bit r/o queue size for the currently selected queue */
  48 #define VIRTIO_PCI_QUEUE_NUM            12
  49
  50 /* A 16-bit r/w queue selector */
  51 #define VIRTIO_PCI_QUEUE_SEL            14
  52
  53 /* A 16-bit r/w queue notifier */
  54 #define VIRTIO_PCI_QUEUE_NOTIFY         16
  55
  56 /* An 8-bit device status register.  */
  57 #define VIRTIO_PCI_STATUS               18
  58
  59 /* An 8-bit r/o interrupt status register.  Reading the value will return the
  60  * current contents of the ISR and will also clear it.  This is effectively
  61  * a read-and-acknowledge. */
  62 #define VIRTIO_PCI_ISR                  19
  63
  64 /* MSI-X registers: only enabled if MSI-X is enabled. */
  65 /* A 16-bit vector for configuration changes. */
  66 #define VIRTIO_MSI_CONFIG_VECTOR        20
  67 /* A 16-bit vector for selected queue notifications. */
  68 #define VIRTIO_MSI_QUEUE_VECTOR         22
  69
  70 /* Config space size */
  71 #define VIRTIO_PCI_CONFIG_NOMSI         20
  72 #define VIRTIO_PCI_CONFIG_MSI           24
  73 #define VIRTIO_PCI_REGION_SIZE(dev)     (msix_present(dev) ? \
  74                                          VIRTIO_PCI_CONFIG_MSI : \
  75                                          VIRTIO_PCI_CONFIG_NOMSI)
  76
  77 /* The remaining space is defined by each driver as the per-driver
  78  * configuration space */
  79 #define VIRTIO_PCI_CONFIG(dev)          (msix_enabled(dev) ? \
  80                                          VIRTIO_PCI_CONFIG_MSI : \
  81                                          VIRTIO_PCI_CONFIG_NOMSI)
  82
  83 /* How many bits to shift physical queue address written to QUEUE_PFN.
  84  * 12 is historical, and due to x86 page size. */
  85 #define VIRTIO_PCI_QUEUE_ADDR_SHIFT    12
  86
  87 /* Flags track per-device state like workarounds for quirks in older guests. */
  88 #define VIRTIO_PCI_FLAG_BUS_MASTER_BUG  (1 << 0)
  89
  90 /* QEMU doesn't strictly need write barriers since everything runs in
  91  * lock-step.  We'll leave the calls to wmb() in though to make it obvious for
  92  * KVM or if kqemu gets SMP support.
  93  */
  94 #define wmb() do { } while (0)
  95
  96 /* HACK for virtio to determine if it's running a big endian guest */
  97 bool virtio_is_big_endian(void);
  98
  99 /* virtio device */
 100
 101 static void virtio_pci_notify(void *opaque, uint16_t vector)
 102 {
 103     VirtIOPCIProxy *proxy = opaque;
 104     if (msix_enabled(&proxy->pci_dev))
 105         msix_notify(&proxy->pci_dev, vector);
 106     else
 107         qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
 108 }
 109
 110 static void virtio_pci_save_config(void * opaque, QEMUFile *f)
 111 {
 112     VirtIOPCIProxy *proxy = opaque;
 113     pci_device_save(&proxy->pci_dev, f);
 114     msix_save(&proxy->pci_dev, f);
 115     if (msix_present(&proxy->pci_dev))
 116         qemu_put_be16(f, proxy->vdev->config_vector);
 117 }
 118
 119 static void virtio_pci_save_queue(void * opaque, int n, QEMUFile *f)
 120 {
 121     VirtIOPCIProxy *proxy = opaque;
 122     if (msix_present(&proxy->pci_dev))
 123         qemu_put_be16(f, virtio_queue_vector(proxy->vdev, n));
 124 }
 125
 126 static int virtio_pci_load_config(void * opaque, QEMUFile *f)
 127 {
 128     VirtIOPCIProxy *proxy = opaque;
 129     int ret;
 130     ret = pci_device_load(&proxy->pci_dev, f);
 131     if (ret) {
 132         return ret;
 133     }
 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)
 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         memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 177                                   true, n, event_notifier_get_fd(notifier));
 178     } else {
 179         memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 180                                   true, n, event_notifier_get_fd(notifier));
 181         /* Handle the race condition where the guest kicked and we deassigned
 182          * before we got around to handling the kick.
 183          */
 184         if (event_notifier_test_and_clear(notifier)) {
 185             virtio_queue_notify_vq(vq);
 186         }
 187
 188         event_notifier_cleanup(notifier);
 189     }
 190     return r;
 191 }
 192
 193 static void virtio_pci_host_notifier_read(void *opaque)
 194 {
 195     VirtQueue *vq = opaque;
 196     EventNotifier *n = virtio_queue_get_host_notifier(vq);
 197     if (event_notifier_test_and_clear(n)) {
 198         virtio_queue_notify_vq(vq);
 199     }
 200 }
 201
 202 static void virtio_pci_set_host_notifier_fd_handler(VirtIOPCIProxy *proxy,
 203                                                     int n, bool assign)
 204 {
 205     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 206     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
 207     if (assign) {
 208         qemu_set_fd_handler(event_notifier_get_fd(notifier),
 209                             virtio_pci_host_notifier_read, NULL, vq);
 210     } else {
 211         qemu_set_fd_handler(event_notifier_get_fd(notifier),
 212                             NULL, NULL, NULL);
 213     }
 214 }
 215
 216 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
 217 {
 218     int n, r;
 219
 220     if (!(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) ||
 221         proxy->ioeventfd_disabled ||
 222         proxy->ioeventfd_started) {
 223         return;
 224     }
 225
 226     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 227         if (!virtio_queue_get_num(proxy->vdev, n)) {
 228             continue;
 229         }
 230
 231         r = virtio_pci_set_host_notifier_internal(proxy, n, true);
 232         if (r < 0) {
 233             goto assign_error;
 234         }
 235
 236         virtio_pci_set_host_notifier_fd_handler(proxy, n, true);
 237     }
 238     proxy->ioeventfd_started = true;
 239     return;
 240
 241 assign_error:
 242     while (--n >= 0) {
 243         if (!virtio_queue_get_num(proxy->vdev, n)) {
 244             continue;
 245         }
 246
 247         virtio_pci_set_host_notifier_fd_handler(proxy, n, false);
 248         r = virtio_pci_set_host_notifier_internal(proxy, n, false);
 249         assert(r >= 0);
 250     }
 251     proxy->ioeventfd_started = false;
 252     error_report("%s: failed. Fallback to a userspace (slower).", __func__);
 253 }
 254
 255 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
 256 {
 257     int r;
 258     int n;
 259
 260     if (!proxy->ioeventfd_started) {
 261         return;
 262     }
 263
 264     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 265         if (!virtio_queue_get_num(proxy->vdev, n)) {
 266             continue;
 267         }
 268
 269         virtio_pci_set_host_notifier_fd_handler(proxy, n, false);
 270         r = virtio_pci_set_host_notifier_internal(proxy, n, false);
 271         assert(r >= 0);
 272     }
 273     proxy->ioeventfd_started = false;
 274 }
 275
 276 void virtio_pci_reset(DeviceState *d)
 277 {
 278     VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 279     virtio_pci_stop_ioeventfd(proxy);
 280     virtio_reset(proxy->vdev);
 281     msix_reset(&proxy->pci_dev);
 282     proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 283 }
 284
 285 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 286 {
 287     VirtIOPCIProxy *proxy = opaque;
 288     VirtIODevice *vdev = proxy->vdev;
 289     target_phys_addr_t pa;
 290
 291     switch (addr) {
 292     case VIRTIO_PCI_GUEST_FEATURES:
 293         /* Guest does not negotiate properly?  We have to assume nothing. */
 294         if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
 295             val = vdev->bad_features ? vdev->bad_features(vdev) : 0;
 296         }
 297         virtio_set_features(vdev, val);
 298         break;
 299     case VIRTIO_PCI_QUEUE_PFN:
 300         pa = (target_phys_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 301         if (pa == 0) {
 302             virtio_pci_stop_ioeventfd(proxy);
 303             virtio_reset(proxy->vdev);
 304             msix_unuse_all_vectors(&proxy->pci_dev);
 305         }
 306         else
 307             virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
 308         break;
 309     case VIRTIO_PCI_QUEUE_SEL:
 310         if (val < VIRTIO_PCI_QUEUE_MAX)
 311             vdev->queue_sel = val;
 312         break;
 313     case VIRTIO_PCI_QUEUE_NOTIFY:
 314         if (val < VIRTIO_PCI_QUEUE_MAX) {
 315             virtio_queue_notify(vdev, val);
 316         }
 317         break;
 318     case VIRTIO_PCI_STATUS:
 319         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
 320             virtio_pci_stop_ioeventfd(proxy);
 321         }
 322
 323         virtio_set_status(vdev, val & 0xFF);
 324
 325         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
 326             virtio_pci_start_ioeventfd(proxy);
 327         }
 328
 329         if (vdev->status == 0) {
 330             virtio_reset(proxy->vdev);
 331             msix_unuse_all_vectors(&proxy->pci_dev);
 332         }
 333
 334         /* Linux before 2.6.34 sets the device as OK without enabling
 335            the PCI device bus master bit. In this case we need to disable
 336            some safety checks. */
 337         if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
 338             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 339             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 340         }
 341         break;
 342     case VIRTIO_MSI_CONFIG_VECTOR:
 343         msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
 344         /* Make it possible for guest to discover an error took place. */
 345         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 346             val = VIRTIO_NO_VECTOR;
 347         vdev->config_vector = val;
 348         break;
 349     case VIRTIO_MSI_QUEUE_VECTOR:
 350         msix_vector_unuse(&proxy->pci_dev,
 351                           virtio_queue_vector(vdev, vdev->queue_sel));
 352         /* Make it possible for guest to discover an error took place. */
 353         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 354             val = VIRTIO_NO_VECTOR;
 355         virtio_queue_set_vector(vdev, vdev->queue_sel, val);
 356         break;
 357     default:
 358         error_report("%s: unexpected address 0x%x value 0x%x",
 359                      __func__, addr, val);
 360         break;
 361     }
 362 }
 363
 364 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
 365 {
 366     VirtIODevice *vdev = proxy->vdev;
 367     uint32_t ret = 0xFFFFFFFF;
 368
 369     switch (addr) {
 370     case VIRTIO_PCI_HOST_FEATURES:
 371         ret = proxy->host_features;
 372         break;
 373     case VIRTIO_PCI_GUEST_FEATURES:
 374         ret = vdev->guest_features;
 375         break;
 376     case VIRTIO_PCI_QUEUE_PFN:
 377         ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
 378               >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 379         break;
 380     case VIRTIO_PCI_QUEUE_NUM:
 381         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
 382         break;
 383     case VIRTIO_PCI_QUEUE_SEL:
 384         ret = vdev->queue_sel;
 385         break;
 386     case VIRTIO_PCI_STATUS:
 387         ret = vdev->status;
 388         break;
 389     case VIRTIO_PCI_ISR:
 390         /* reading from the ISR also clears it. */
 391         ret = vdev->isr;
 392         vdev->isr = 0;
 393         qemu_set_irq(proxy->pci_dev.irq[0], 0);
 394         break;
 395     case VIRTIO_MSI_CONFIG_VECTOR:
 396         ret = vdev->config_vector;
 397         break;
 398     case VIRTIO_MSI_QUEUE_VECTOR:
 399         ret = virtio_queue_vector(vdev, vdev->queue_sel);
 400         break;
 401     default:
 402         break;
 403     }
 404
 405     return ret;
 406 }
 407
 408 static uint32_t virtio_pci_config_readb(void *opaque, uint32_t addr)
 409 {
 410     VirtIOPCIProxy *proxy = opaque;
 411     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 412     if (addr < config)
 413         return virtio_ioport_read(proxy, addr);
 414     addr -= config;
 415     return virtio_config_readb(proxy->vdev, addr);
 416 }
 417
 418 static uint32_t virtio_pci_config_readw(void *opaque, uint32_t addr)
 419 {
 420     VirtIOPCIProxy *proxy = opaque;
 421     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 422     uint16_t val;
 423     if (addr < config)
 424         return virtio_ioport_read(proxy, addr);
 425     addr -= config;
 426     val = virtio_config_readw(proxy->vdev, addr);
 427     if (virtio_is_big_endian()) {
 428         /*
 429          * virtio is odd, ioports are LE but config space is target native
 430          * endian. However, in qemu, all PIO is LE, so we need to re-swap
 431          * on BE targets
 432          */
 433         val = bswap16(val);
 434     }
 435     return val;
 436 }
 437
 438 static uint32_t virtio_pci_config_readl(void *opaque, uint32_t addr)
 439 {
 440     VirtIOPCIProxy *proxy = opaque;
 441     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 442     uint32_t val;
 443     if (addr < config)
 444         return virtio_ioport_read(proxy, addr);
 445     addr -= config;
 446     val = virtio_config_readl(proxy->vdev, addr);
 447     if (virtio_is_big_endian()) {
 448         val = bswap32(val);
 449     }
 450     return val;
 451 }
 452
 453 static void virtio_pci_config_writeb(void *opaque, uint32_t addr, uint32_t val)
 454 {
 455     VirtIOPCIProxy *proxy = opaque;
 456     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 457     if (addr < config) {
 458         virtio_ioport_write(proxy, addr, val);
 459         return;
 460     }
 461     addr -= config;
 462     virtio_config_writeb(proxy->vdev, addr, val);
 463 }
 464
 465 static void virtio_pci_config_writew(void *opaque, uint32_t addr, uint32_t val)
 466 {
 467     VirtIOPCIProxy *proxy = opaque;
 468     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 469     if (addr < config) {
 470         virtio_ioport_write(proxy, addr, val);
 471         return;
 472     }
 473     addr -= config;
 474     if (virtio_is_big_endian()) {
 475         val = bswap16(val);
 476     }
 477     virtio_config_writew(proxy->vdev, addr, val);
 478 }
 479
 480 static void virtio_pci_config_writel(void *opaque, uint32_t addr, uint32_t val)
 481 {
 482     VirtIOPCIProxy *proxy = opaque;
 483     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 484     if (addr < config) {
 485         virtio_ioport_write(proxy, addr, val);
 486         return;
 487     }
 488     addr -= config;
 489     if (virtio_is_big_endian()) {
 490         val = bswap32(val);
 491     }
 492     virtio_config_writel(proxy->vdev, addr, val);
 493 }
 494
 495 static const MemoryRegionPortio virtio_portio[] = {
 496     { 0, 0x10000, 1, .write = virtio_pci_config_writeb, },
 497     { 0, 0x10000, 2, .write = virtio_pci_config_writew, },
 498     { 0, 0x10000, 4, .write = virtio_pci_config_writel, },
 499     { 0, 0x10000, 1, .read = virtio_pci_config_readb, },
 500     { 0, 0x10000, 2, .read = virtio_pci_config_readw, },
 501     { 0, 0x10000, 4, .read = virtio_pci_config_readl, },
 502     PORTIO_END_OF_LIST()
 503 };
 504
 505 static const MemoryRegionOps virtio_pci_config_ops = {
 506     .old_portio = virtio_portio,
 507     .endianness = DEVICE_LITTLE_ENDIAN,
 508 };
 509
 510 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 511                                 uint32_t val, int len)
 512 {
 513     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 514
 515     pci_default_write_config(pci_dev, address, val, len);
 516
 517     if (range_covers_byte(address, len, PCI_COMMAND) &&
 518         !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER) &&
 519         !(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
 520         virtio_pci_stop_ioeventfd(proxy);
 521         virtio_set_status(proxy->vdev,
 522                           proxy->vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
 523     }
 524
 525     msix_write_config(pci_dev, address, val, len);
 526 }
 527
 528 static unsigned virtio_pci_get_features(void *opaque)
 529 {
 530     VirtIOPCIProxy *proxy = opaque;
 531     return proxy->host_features;
 532 }
 533
 534 static void virtio_pci_guest_notifier_read(void *opaque)
 535 {
 536     VirtQueue *vq = opaque;
 537     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 538     if (event_notifier_test_and_clear(n)) {
 539         virtio_irq(vq);
 540     }
 541 }
 542
 543 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
 544                                         unsigned int queue_no,
 545                                         unsigned int vector,
 546                                         MSIMessage msg)
 547 {
 548     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 549     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 550     int fd, ret;
 551
 552     fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vq));
 553
 554     if (irqfd->users == 0) {
 555         ret = kvm_irqchip_add_msi_route(kvm_state, msg);
 556         if (ret < 0) {
 557             return ret;
 558         }
 559         irqfd->virq = ret;
 560     }
 561     irqfd->users++;
 562
 563     ret = kvm_irqchip_add_irqfd(kvm_state, fd, irqfd->virq);
 564     if (ret < 0) {
 565         if (--irqfd->users == 0) {
 566             kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 567         }
 568         return ret;
 569     }
 570
 571     qemu_set_fd_handler(fd, NULL, NULL, NULL);
 572
 573     return 0;
 574 }
 575
 576 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
 577                                              unsigned int queue_no,
 578                                              unsigned int vector)
 579 {
 580     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 581     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 582     int fd, ret;
 583
 584     fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vq));
 585
 586     ret = kvm_irqchip_remove_irqfd(kvm_state, fd, irqfd->virq);
 587     assert(ret == 0);
 588
 589     if (--irqfd->users == 0) {
 590         kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 591     }
 592
 593     qemu_set_fd_handler(fd, virtio_pci_guest_notifier_read, NULL, vq);
 594 }
 595
 596 static int kvm_virtio_pci_vector_use(PCIDevice *dev, unsigned vector,
 597                                      MSIMessage msg)
 598 {
 599     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 600     VirtIODevice *vdev = proxy->vdev;
 601     int ret, queue_no;
 602
 603     for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) {
 604         if (!virtio_queue_get_num(vdev, queue_no)) {
 605             break;
 606         }
 607         if (virtio_queue_vector(vdev, queue_no) != vector) {
 608             continue;
 609         }
 610         ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector, msg);
 611         if (ret < 0) {
 612             goto undo;
 613         }
 614     }
 615     return 0;
 616
 617 undo:
 618     while (--queue_no >= 0) {
 619         if (virtio_queue_vector(vdev, queue_no) != vector) {
 620             continue;
 621         }
 622         kvm_virtio_pci_vq_vector_release(proxy, queue_no, vector);
 623     }
 624     return ret;
 625 }
 626
 627 static void kvm_virtio_pci_vector_release(PCIDevice *dev, unsigned vector)
 628 {
 629     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 630     VirtIODevice *vdev = proxy->vdev;
 631     int queue_no;
 632
 633     for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) {
 634         if (!virtio_queue_get_num(vdev, queue_no)) {
 635             break;
 636         }
 637         if (virtio_queue_vector(vdev, queue_no) != vector) {
 638             continue;
 639         }
 640         kvm_virtio_pci_vq_vector_release(proxy, queue_no, vector);
 641     }
 642 }
 643
 644 static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign)
 645 {
 646     VirtIOPCIProxy *proxy = opaque;
 647     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 648     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 649
 650     if (assign) {
 651         int r = event_notifier_init(notifier, 0);
 652         if (r < 0) {
 653             return r;
 654         }
 655         qemu_set_fd_handler(event_notifier_get_fd(notifier),
 656                             virtio_pci_guest_notifier_read, NULL, vq);
 657     } else {
 658         qemu_set_fd_handler(event_notifier_get_fd(notifier),
 659                             NULL, NULL, NULL);
 660         /* Test and clear notifier before closing it,
 661          * in case poll callback didn't have time to run. */
 662         virtio_pci_guest_notifier_read(vq);
 663         event_notifier_cleanup(notifier);
 664     }
 665
 666     return 0;
 667 }
 668
 669 static bool virtio_pci_query_guest_notifiers(void *opaque)
 670 {
 671     VirtIOPCIProxy *proxy = opaque;
 672     return msix_enabled(&proxy->pci_dev);
 673 }
 674
 675 static int virtio_pci_set_guest_notifiers(void *opaque, bool assign)
 676 {
 677     VirtIOPCIProxy *proxy = opaque;
 678     VirtIODevice *vdev = proxy->vdev;
 679     int r, n;
 680
 681     /* Must unset vector notifier while guest notifier is still assigned */
 682     if (kvm_irqchip_in_kernel() && !assign) {
 683         msix_unset_vector_notifiers(&proxy->pci_dev);
 684         g_free(proxy->vector_irqfd);
 685         proxy->vector_irqfd = NULL;
 686     }
 687
 688     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 689         if (!virtio_queue_get_num(vdev, n)) {
 690             break;
 691         }
 692
 693         r = virtio_pci_set_guest_notifier(opaque, n, assign);
 694         if (r < 0) {
 695             goto assign_error;
 696         }
 697     }
 698
 699     /* Must set vector notifier after guest notifier has been assigned */
 700     if (kvm_irqchip_in_kernel() && assign) {
 701         proxy->vector_irqfd =
 702             g_malloc0(sizeof(*proxy->vector_irqfd) *
 703                       msix_nr_vectors_allocated(&proxy->pci_dev));
 704         r = msix_set_vector_notifiers(&proxy->pci_dev,
 705                                       kvm_virtio_pci_vector_use,
 706                                       kvm_virtio_pci_vector_release);
 707         if (r < 0) {
 708             goto assign_error;
 709         }
 710     }
 711
 712     return 0;
 713
 714 assign_error:
 715     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
 716     assert(assign);
 717     while (--n >= 0) {
 718         virtio_pci_set_guest_notifier(opaque, n, !assign);
 719     }
 720     return r;
 721 }
 722
 723 static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign)
 724 {
 725     VirtIOPCIProxy *proxy = opaque;
 726
 727     /* Stop using ioeventfd for virtqueue kick if the device starts using host
 728      * notifiers.  This makes it easy to avoid stepping on each others' toes.
 729      */
 730     proxy->ioeventfd_disabled = assign;
 731     if (assign) {
 732         virtio_pci_stop_ioeventfd(proxy);
 733     }
 734     /* We don't need to start here: it's not needed because backend
 735      * currently only stops on status change away from ok,
 736      * reset, vmstop and such. If we do add code to start here,
 737      * need to check vmstate, device state etc. */
 738     return virtio_pci_set_host_notifier_internal(proxy, n, assign);
 739 }
 740
 741 static void virtio_pci_vmstate_change(void *opaque, bool running)
 742 {
 743     VirtIOPCIProxy *proxy = opaque;
 744
 745     if (running) {
 746         /* Try to find out if the guest has bus master disabled, but is
 747            in ready state. Then we have a buggy guest OS. */
 748         if ((proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
 749             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 750             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 751         }
 752         virtio_pci_start_ioeventfd(proxy);
 753     } else {
 754         virtio_pci_stop_ioeventfd(proxy);
 755     }
 756 }
 757
 758 static const VirtIOBindings virtio_pci_bindings = {
 759     .notify = virtio_pci_notify,
 760     .save_config = virtio_pci_save_config,
 761     .load_config = virtio_pci_load_config,
 762     .save_queue = virtio_pci_save_queue,
 763     .load_queue = virtio_pci_load_queue,
 764     .get_features = virtio_pci_get_features,
 765     .query_guest_notifiers = virtio_pci_query_guest_notifiers,
 766     .set_host_notifier = virtio_pci_set_host_notifier,
 767     .set_guest_notifiers = virtio_pci_set_guest_notifiers,
 768     .vmstate_change = virtio_pci_vmstate_change,
 769 };
 770
 771 void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev)
 772 {
 773     uint8_t *config;
 774     uint32_t size;
 775
 776     proxy->vdev = vdev;
 777
 778     config = proxy->pci_dev.config;
 779
 780     if (proxy->class_code) {
 781         pci_config_set_class(config, proxy->class_code);
 782     }
 783     pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
 784                  pci_get_word(config + PCI_VENDOR_ID));
 785     pci_set_word(config + PCI_SUBSYSTEM_ID, vdev->device_id);
 786     config[PCI_INTERRUPT_PIN] = 1;
 787
 788     memory_region_init(&proxy->msix_bar, "virtio-msix", 4096);
 789     if (vdev->nvectors && !msix_init(&proxy->pci_dev, vdev->nvectors,
 790                                      &proxy->msix_bar, 1, 0)) {
 791         pci_register_bar(&proxy->pci_dev, 1, PCI_BASE_ADDRESS_SPACE_MEMORY,
 792                          &proxy->msix_bar);
 793     } else
 794         vdev->nvectors = 0;
 795
 796     proxy->pci_dev.config_write = virtio_write_config;
 797
 798     size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len;
 799     if (size & (size-1))
 800         size = 1 << qemu_fls(size);
 801
 802     memory_region_init_io(&proxy->bar, &virtio_pci_config_ops, proxy,
 803                           "virtio-pci", size);
 804     pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
 805                      &proxy->bar);
 806
 807     if (!kvm_has_many_ioeventfds()) {
 808         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
 809     }
 810
 811     virtio_bind_device(vdev, &virtio_pci_bindings, proxy);
 812     proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
 813     proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
 814     proxy->host_features = vdev->get_features(vdev, proxy->host_features);
 815 }
 816
 817 static int virtio_blk_init_pci(PCIDevice *pci_dev)
 818 {
 819     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 820     VirtIODevice *vdev;
 821
 822     if (proxy->class_code != PCI_CLASS_STORAGE_SCSI &&
 823         proxy->class_code != PCI_CLASS_STORAGE_OTHER)
 824         proxy->class_code = PCI_CLASS_STORAGE_SCSI;
 825
 826     vdev = virtio_blk_init(&pci_dev->qdev, &proxy->blk);
 827     if (!vdev) {
 828         return -1;
 829     }
 830     vdev->nvectors = proxy->nvectors;
 831     virtio_init_pci(proxy, vdev);
 832     /* make the actual value visible */
 833     proxy->nvectors = vdev->nvectors;
 834     return 0;
 835 }
 836
 837 static int virtio_exit_pci(PCIDevice *pci_dev)
 838 {
 839     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 840     int r;
 841
 842     memory_region_destroy(&proxy->bar);
 843     r = msix_uninit(pci_dev, &proxy->msix_bar);
 844     memory_region_destroy(&proxy->msix_bar);
 845     return r;
 846 }
 847
 848 static int virtio_blk_exit_pci(PCIDevice *pci_dev)
 849 {
 850     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 851
 852     virtio_pci_stop_ioeventfd(proxy);
 853     virtio_blk_exit(proxy->vdev);
 854     return virtio_exit_pci(pci_dev);
 855 }
 856
 857 static int virtio_serial_init_pci(PCIDevice *pci_dev)
 858 {
 859     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 860     VirtIODevice *vdev;
 861
 862     if (proxy->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
 863         proxy->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
 864         proxy->class_code != PCI_CLASS_OTHERS)          /* qemu-kvm  */
 865         proxy->class_code = PCI_CLASS_COMMUNICATION_OTHER;
 866
 867     vdev = virtio_serial_init(&pci_dev->qdev, &proxy->serial);
 868     if (!vdev) {
 869         return -1;
 870     }
 871     vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED
 872                                         ? proxy->serial.max_virtserial_ports + 1
 873                                         : proxy->nvectors;
 874     virtio_init_pci(proxy, vdev);
 875     proxy->nvectors = vdev->nvectors;
 876     return 0;
 877 }
 878
 879 static int virtio_serial_exit_pci(PCIDevice *pci_dev)
 880 {
 881     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 882
 883     virtio_pci_stop_ioeventfd(proxy);
 884     virtio_serial_exit(proxy->vdev);
 885     return virtio_exit_pci(pci_dev);
 886 }
 887
 888 static int virtio_net_init_pci(PCIDevice *pci_dev)
 889 {
 890     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 891     VirtIODevice *vdev;
 892
 893     vdev = virtio_net_init(&pci_dev->qdev, &proxy->nic, &proxy->net);
 894
 895     vdev->nvectors = proxy->nvectors;
 896     virtio_init_pci(proxy, vdev);
 897
 898     /* make the actual value visible */
 899     proxy->nvectors = vdev->nvectors;
 900     return 0;
 901 }
 902
 903 static int virtio_net_exit_pci(PCIDevice *pci_dev)
 904 {
 905     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 906
 907     virtio_pci_stop_ioeventfd(proxy);
 908     virtio_net_exit(proxy->vdev);
 909     return virtio_exit_pci(pci_dev);
 910 }
 911
 912 static int virtio_balloon_init_pci(PCIDevice *pci_dev)
 913 {
 914     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 915     VirtIODevice *vdev;
 916
 917     if (proxy->class_code != PCI_CLASS_OTHERS &&
 918         proxy->class_code != PCI_CLASS_MEMORY_RAM) { /* qemu < 1.1 */
 919         proxy->class_code = PCI_CLASS_OTHERS;
 920     }
 921
 922     vdev = virtio_balloon_init(&pci_dev->qdev);
 923     if (!vdev) {
 924         return -1;
 925     }
 926     virtio_init_pci(proxy, vdev);
 927     return 0;
 928 }
 929
 930 static int virtio_balloon_exit_pci(PCIDevice *pci_dev)
 931 {
 932     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 933
 934     virtio_pci_stop_ioeventfd(proxy);
 935     virtio_balloon_exit(proxy->vdev);
 936     return virtio_exit_pci(pci_dev);
 937 }
 938
 939 static Property virtio_blk_properties[] = {
 940     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
 941     DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, blk.conf),
 942     DEFINE_PROP_STRING("serial", VirtIOPCIProxy, blk.serial),
 943 #ifdef __linux__
 944     DEFINE_PROP_BIT("scsi", VirtIOPCIProxy, blk.scsi, 0, true),
 945 #endif
 946     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
 947     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
 948     DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features),
 949     DEFINE_PROP_END_OF_LIST(),
 950 };
 951
 952 static void virtio_blk_class_init(ObjectClass *klass, void *data)
 953 {
 954     DeviceClass *dc = DEVICE_CLASS(klass);
 955     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 956
 957     k->init = virtio_blk_init_pci;
 958     k->exit = virtio_blk_exit_pci;
 959     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 960     k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
 961     k->revision = VIRTIO_PCI_ABI_VERSION;
 962     k->class_id = PCI_CLASS_STORAGE_SCSI;
 963     dc->reset = virtio_pci_reset;
 964     dc->props = virtio_blk_properties;
 965 }
 966
 967 static TypeInfo virtio_blk_info = {
 968     .name          = "virtio-blk-pci",
 969     .parent        = TYPE_PCI_DEVICE,
 970     .instance_size = sizeof(VirtIOPCIProxy),
 971     .class_init    = virtio_blk_class_init,
 972 };
 973
 974 static Property virtio_net_properties[] = {
 975     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
 976     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
 977     DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features),
 978     DEFINE_NIC_PROPERTIES(VirtIOPCIProxy, nic),
 979     DEFINE_PROP_UINT32("x-txtimer", VirtIOPCIProxy, net.txtimer, TX_TIMER_INTERVAL),
 980     DEFINE_PROP_INT32("x-txburst", VirtIOPCIProxy, net.txburst, TX_BURST),
 981     DEFINE_PROP_STRING("tx", VirtIOPCIProxy, net.tx),
 982     DEFINE_PROP_END_OF_LIST(),
 983 };
 984
 985 static void virtio_net_class_init(ObjectClass *klass, void *data)
 986 {
 987     DeviceClass *dc = DEVICE_CLASS(klass);
 988     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 989
 990     k->init = virtio_net_init_pci;
 991     k->exit = virtio_net_exit_pci;
 992     k->romfile = "pxe-virtio.rom";
 993     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 994     k->device_id = PCI_DEVICE_ID_VIRTIO_NET;
 995     k->revision = VIRTIO_PCI_ABI_VERSION;
 996     k->class_id = PCI_CLASS_NETWORK_ETHERNET;
 997     dc->reset = virtio_pci_reset;
 998     dc->props = virtio_net_properties;
 999 }
1000
1001 static TypeInfo virtio_net_info = {
1002     .name          = "virtio-net-pci",
1003     .parent        = TYPE_PCI_DEVICE,
1004     .instance_size = sizeof(VirtIOPCIProxy),
1005     .class_init    = virtio_net_class_init,
1006 };
1007
1008 static Property virtio_serial_properties[] = {
1009     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1010     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, DEV_NVECTORS_UNSPECIFIED),
1011     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1012     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1013     DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, serial.max_virtserial_ports, 31),
1014     DEFINE_PROP_END_OF_LIST(),
1015 };
1016
1017 static void virtio_serial_class_init(ObjectClass *klass, void *data)
1018 {
1019     DeviceClass *dc = DEVICE_CLASS(klass);
1020     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1021
1022     k->init = virtio_serial_init_pci;
1023     k->exit = virtio_serial_exit_pci;
1024     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1025     k->device_id = PCI_DEVICE_ID_VIRTIO_CONSOLE;
1026     k->revision = VIRTIO_PCI_ABI_VERSION;
1027     k->class_id = PCI_CLASS_COMMUNICATION_OTHER;
1028     dc->reset = virtio_pci_reset;
1029     dc->props = virtio_serial_properties;
1030 }
1031
1032 static TypeInfo virtio_serial_info = {
1033     .name          = "virtio-serial-pci",
1034     .parent        = TYPE_PCI_DEVICE,
1035     .instance_size = sizeof(VirtIOPCIProxy),
1036     .class_init    = virtio_serial_class_init,
1037 };
1038
1039 static Property virtio_balloon_properties[] = {
1040     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1041     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1042     DEFINE_PROP_END_OF_LIST(),
1043 };
1044
1045 static void virtio_balloon_class_init(ObjectClass *klass, void *data)
1046 {
1047     DeviceClass *dc = DEVICE_CLASS(klass);
1048     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1049
1050     k->init = virtio_balloon_init_pci;
1051     k->exit = virtio_balloon_exit_pci;
1052     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1053     k->device_id = PCI_DEVICE_ID_VIRTIO_BALLOON;
1054     k->revision = VIRTIO_PCI_ABI_VERSION;
1055     k->class_id = PCI_CLASS_OTHERS;
1056     dc->reset = virtio_pci_reset;
1057     dc->props = virtio_balloon_properties;
1058 }
1059
1060 static TypeInfo virtio_balloon_info = {
1061     .name          = "virtio-balloon-pci",
1062     .parent        = TYPE_PCI_DEVICE,
1063     .instance_size = sizeof(VirtIOPCIProxy),
1064     .class_init    = virtio_balloon_class_init,
1065 };
1066
1067 static int virtio_scsi_init_pci(PCIDevice *pci_dev)
1068 {
1069     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1070     VirtIODevice *vdev;
1071
1072     vdev = virtio_scsi_init(&pci_dev->qdev, &proxy->scsi);
1073     if (!vdev) {
1074         return -EINVAL;
1075     }
1076
1077     vdev->nvectors = proxy->nvectors;
1078     virtio_init_pci(proxy, vdev);
1079
1080     /* make the actual value visible */
1081     proxy->nvectors = vdev->nvectors;
1082     return 0;
1083 }
1084
1085 static int virtio_scsi_exit_pci(PCIDevice *pci_dev)
1086 {
1087     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1088
1089     virtio_scsi_exit(proxy->vdev);
1090     return virtio_exit_pci(pci_dev);
1091 }
1092
1093 static Property virtio_scsi_properties[] = {
1094     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1095     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOPCIProxy, host_features, scsi),
1096     DEFINE_PROP_END_OF_LIST(),
1097 };
1098
1099 static void virtio_scsi_class_init(ObjectClass *klass, void *data)
1100 {
1101     DeviceClass *dc = DEVICE_CLASS(klass);
1102     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1103
1104     k->init = virtio_scsi_init_pci;
1105     k->exit = virtio_scsi_exit_pci;
1106     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1107     k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1108     k->revision = 0x00;
1109     k->class_id = PCI_CLASS_STORAGE_SCSI;
1110     dc->reset = virtio_pci_reset;
1111     dc->props = virtio_scsi_properties;
1112 }
1113
1114 static TypeInfo virtio_scsi_info = {
1115     .name          = "virtio-scsi-pci",
1116     .parent        = TYPE_PCI_DEVICE,
1117     .instance_size = sizeof(VirtIOPCIProxy),
1118     .class_init    = virtio_scsi_class_init,
1119 };
1120
1121 static void virtio_pci_register_types(void)
1122 {
1123     type_register_static(&virtio_blk_info);
1124     type_register_static(&virtio_net_info);
1125     type_register_static(&virtio_serial_info);
1126     type_register_static(&virtio_balloon_info);
1127     type_register_static(&virtio_scsi_info);
1128 }
1129
1130 type_init(virtio_pci_register_types)