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     proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 282 }
 283
 284 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 285 {
 286     VirtIOPCIProxy *proxy = opaque;
 287     VirtIODevice *vdev = proxy->vdev;
 288     target_phys_addr_t pa;
 289
 290     switch (addr) {
 291     case VIRTIO_PCI_GUEST_FEATURES:
 292         /* Guest does not negotiate properly?  We have to assume nothing. */
 293         if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
 294             val = vdev->bad_features ? vdev->bad_features(vdev) : 0;
 295         }
 296         virtio_set_features(vdev, val);
 297         break;
 298     case VIRTIO_PCI_QUEUE_PFN:
 299         pa = (target_phys_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 300         if (pa == 0) {
 301             virtio_pci_stop_ioeventfd(proxy);
 302             virtio_reset(proxy->vdev);
 303             msix_unuse_all_vectors(&proxy->pci_dev);
 304         }
 305         else
 306             virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
 307         break;
 308     case VIRTIO_PCI_QUEUE_SEL:
 309         if (val < VIRTIO_PCI_QUEUE_MAX)
 310             vdev->queue_sel = val;
 311         break;
 312     case VIRTIO_PCI_QUEUE_NOTIFY:
 313         if (val < VIRTIO_PCI_QUEUE_MAX) {
 314             virtio_queue_notify(vdev, val);
 315         }
 316         break;
 317     case VIRTIO_PCI_STATUS:
 318         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
 319             virtio_pci_stop_ioeventfd(proxy);
 320         }
 321
 322         virtio_set_status(vdev, val & 0xFF);
 323
 324         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
 325             virtio_pci_start_ioeventfd(proxy);
 326         }
 327
 328         if (vdev->status == 0) {
 329             virtio_reset(proxy->vdev);
 330             msix_unuse_all_vectors(&proxy->pci_dev);
 331         }
 332
 333         /* Linux before 2.6.34 sets the device as OK without enabling
 334            the PCI device bus master bit. In this case we need to disable
 335            some safety checks. */
 336         if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
 337             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 338             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 339         }
 340         break;
 341     case VIRTIO_MSI_CONFIG_VECTOR:
 342         msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
 343         /* Make it possible for guest to discover an error took place. */
 344         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 345             val = VIRTIO_NO_VECTOR;
 346         vdev->config_vector = val;
 347         break;
 348     case VIRTIO_MSI_QUEUE_VECTOR:
 349         msix_vector_unuse(&proxy->pci_dev,
 350                           virtio_queue_vector(vdev, vdev->queue_sel));
 351         /* Make it possible for guest to discover an error took place. */
 352         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 353             val = VIRTIO_NO_VECTOR;
 354         virtio_queue_set_vector(vdev, vdev->queue_sel, val);
 355         break;
 356     default:
 357         error_report("%s: unexpected address 0x%x value 0x%x",
 358                      __func__, addr, val);
 359         break;
 360     }
 361 }
 362
 363 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
 364 {
 365     VirtIODevice *vdev = proxy->vdev;
 366     uint32_t ret = 0xFFFFFFFF;
 367
 368     switch (addr) {
 369     case VIRTIO_PCI_HOST_FEATURES:
 370         ret = proxy->host_features;
 371         break;
 372     case VIRTIO_PCI_GUEST_FEATURES:
 373         ret = vdev->guest_features;
 374         break;
 375     case VIRTIO_PCI_QUEUE_PFN:
 376         ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
 377               >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 378         break;
 379     case VIRTIO_PCI_QUEUE_NUM:
 380         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
 381         break;
 382     case VIRTIO_PCI_QUEUE_SEL:
 383         ret = vdev->queue_sel;
 384         break;
 385     case VIRTIO_PCI_STATUS:
 386         ret = vdev->status;
 387         break;
 388     case VIRTIO_PCI_ISR:
 389         /* reading from the ISR also clears it. */
 390         ret = vdev->isr;
 391         vdev->isr = 0;
 392         qemu_set_irq(proxy->pci_dev.irq[0], 0);
 393         break;
 394     case VIRTIO_MSI_CONFIG_VECTOR:
 395         ret = vdev->config_vector;
 396         break;
 397     case VIRTIO_MSI_QUEUE_VECTOR:
 398         ret = virtio_queue_vector(vdev, vdev->queue_sel);
 399         break;
 400     default:
 401         break;
 402     }
 403
 404     return ret;
 405 }
 406
 407 static uint32_t virtio_pci_config_readb(void *opaque, uint32_t addr)
 408 {
 409     VirtIOPCIProxy *proxy = opaque;
 410     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 411     if (addr < config)
 412         return virtio_ioport_read(proxy, addr);
 413     addr -= config;
 414     return virtio_config_readb(proxy->vdev, addr);
 415 }
 416
 417 static uint32_t virtio_pci_config_readw(void *opaque, uint32_t addr)
 418 {
 419     VirtIOPCIProxy *proxy = opaque;
 420     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 421     uint16_t val;
 422     if (addr < config)
 423         return virtio_ioport_read(proxy, addr);
 424     addr -= config;
 425     val = virtio_config_readw(proxy->vdev, addr);
 426     if (virtio_is_big_endian()) {
 427         /*
 428          * virtio is odd, ioports are LE but config space is target native
 429          * endian. However, in qemu, all PIO is LE, so we need to re-swap
 430          * on BE targets
 431          */
 432         val = bswap16(val);
 433     }
 434     return val;
 435 }
 436
 437 static uint32_t virtio_pci_config_readl(void *opaque, uint32_t addr)
 438 {
 439     VirtIOPCIProxy *proxy = opaque;
 440     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 441     uint32_t val;
 442     if (addr < config)
 443         return virtio_ioport_read(proxy, addr);
 444     addr -= config;
 445     val = virtio_config_readl(proxy->vdev, addr);
 446     if (virtio_is_big_endian()) {
 447         val = bswap32(val);
 448     }
 449     return val;
 450 }
 451
 452 static void virtio_pci_config_writeb(void *opaque, uint32_t addr, uint32_t val)
 453 {
 454     VirtIOPCIProxy *proxy = opaque;
 455     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 456     if (addr < config) {
 457         virtio_ioport_write(proxy, addr, val);
 458         return;
 459     }
 460     addr -= config;
 461     virtio_config_writeb(proxy->vdev, addr, val);
 462 }
 463
 464 static void virtio_pci_config_writew(void *opaque, uint32_t addr, uint32_t val)
 465 {
 466     VirtIOPCIProxy *proxy = opaque;
 467     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 468     if (addr < config) {
 469         virtio_ioport_write(proxy, addr, val);
 470         return;
 471     }
 472     addr -= config;
 473     if (virtio_is_big_endian()) {
 474         val = bswap16(val);
 475     }
 476     virtio_config_writew(proxy->vdev, addr, val);
 477 }
 478
 479 static void virtio_pci_config_writel(void *opaque, uint32_t addr, uint32_t val)
 480 {
 481     VirtIOPCIProxy *proxy = opaque;
 482     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 483     if (addr < config) {
 484         virtio_ioport_write(proxy, addr, val);
 485         return;
 486     }
 487     addr -= config;
 488     if (virtio_is_big_endian()) {
 489         val = bswap32(val);
 490     }
 491     virtio_config_writel(proxy->vdev, addr, val);
 492 }
 493
 494 static const MemoryRegionPortio virtio_portio[] = {
 495     { 0, 0x10000, 1, .write = virtio_pci_config_writeb, },
 496     { 0, 0x10000, 2, .write = virtio_pci_config_writew, },
 497     { 0, 0x10000, 4, .write = virtio_pci_config_writel, },
 498     { 0, 0x10000, 1, .read = virtio_pci_config_readb, },
 499     { 0, 0x10000, 2, .read = virtio_pci_config_readw, },
 500     { 0, 0x10000, 4, .read = virtio_pci_config_readl, },
 501     PORTIO_END_OF_LIST()
 502 };
 503
 504 static const MemoryRegionOps virtio_pci_config_ops = {
 505     .old_portio = virtio_portio,
 506     .endianness = DEVICE_LITTLE_ENDIAN,
 507 };
 508
 509 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 510                                 uint32_t val, int len)
 511 {
 512     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 513
 514     pci_default_write_config(pci_dev, address, val, len);
 515
 516     if (range_covers_byte(address, len, PCI_COMMAND) &&
 517         !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER) &&
 518         !(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
 519         virtio_pci_stop_ioeventfd(proxy);
 520         virtio_set_status(proxy->vdev,
 521                           proxy->vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
 522     }
 523 }
 524
 525 static unsigned virtio_pci_get_features(void *opaque)
 526 {
 527     VirtIOPCIProxy *proxy = opaque;
 528     return proxy->host_features;
 529 }
 530
 531 static void virtio_pci_guest_notifier_read(void *opaque)
 532 {
 533     VirtQueue *vq = opaque;
 534     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 535     if (event_notifier_test_and_clear(n)) {
 536         virtio_irq(vq);
 537     }
 538 }
 539
 540 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
 541                                         unsigned int queue_no,
 542                                         unsigned int vector,
 543                                         MSIMessage msg)
 544 {
 545     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 546     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 547     int fd, ret;
 548
 549     fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vq));
 550
 551     if (irqfd->users == 0) {
 552         ret = kvm_irqchip_add_msi_route(kvm_state, msg);
 553         if (ret < 0) {
 554             return ret;
 555         }
 556         irqfd->virq = ret;
 557     }
 558     irqfd->users++;
 559
 560     ret = kvm_irqchip_add_irqfd(kvm_state, fd, irqfd->virq);
 561     if (ret < 0) {
 562         if (--irqfd->users == 0) {
 563             kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 564         }
 565         return ret;
 566     }
 567
 568     qemu_set_fd_handler(fd, NULL, NULL, NULL);
 569
 570     return 0;
 571 }
 572
 573 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
 574                                              unsigned int queue_no,
 575                                              unsigned int vector)
 576 {
 577     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 578     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 579     int fd, ret;
 580
 581     fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vq));
 582
 583     ret = kvm_irqchip_remove_irqfd(kvm_state, fd, irqfd->virq);
 584     assert(ret == 0);
 585
 586     if (--irqfd->users == 0) {
 587         kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 588     }
 589
 590     qemu_set_fd_handler(fd, virtio_pci_guest_notifier_read, NULL, vq);
 591 }
 592
 593 static int kvm_virtio_pci_vector_use(PCIDevice *dev, unsigned vector,
 594                                      MSIMessage msg)
 595 {
 596     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 597     VirtIODevice *vdev = proxy->vdev;
 598     int ret, queue_no;
 599
 600     for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) {
 601         if (!virtio_queue_get_num(vdev, queue_no)) {
 602             break;
 603         }
 604         if (virtio_queue_vector(vdev, queue_no) != vector) {
 605             continue;
 606         }
 607         ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector, msg);
 608         if (ret < 0) {
 609             goto undo;
 610         }
 611     }
 612     return 0;
 613
 614 undo:
 615     while (--queue_no >= 0) {
 616         if (virtio_queue_vector(vdev, queue_no) != vector) {
 617             continue;
 618         }
 619         kvm_virtio_pci_vq_vector_release(proxy, queue_no, vector);
 620     }
 621     return ret;
 622 }
 623
 624 static void kvm_virtio_pci_vector_release(PCIDevice *dev, unsigned vector)
 625 {
 626     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 627     VirtIODevice *vdev = proxy->vdev;
 628     int queue_no;
 629
 630     for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) {
 631         if (!virtio_queue_get_num(vdev, queue_no)) {
 632             break;
 633         }
 634         if (virtio_queue_vector(vdev, queue_no) != vector) {
 635             continue;
 636         }
 637         kvm_virtio_pci_vq_vector_release(proxy, queue_no, vector);
 638     }
 639 }
 640
 641 static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign)
 642 {
 643     VirtIOPCIProxy *proxy = opaque;
 644     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 645     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 646
 647     if (assign) {
 648         int r = event_notifier_init(notifier, 0);
 649         if (r < 0) {
 650             return r;
 651         }
 652         qemu_set_fd_handler(event_notifier_get_fd(notifier),
 653                             virtio_pci_guest_notifier_read, NULL, vq);
 654     } else {
 655         qemu_set_fd_handler(event_notifier_get_fd(notifier),
 656                             NULL, NULL, NULL);
 657         /* Test and clear notifier before closing it,
 658          * in case poll callback didn't have time to run. */
 659         virtio_pci_guest_notifier_read(vq);
 660         event_notifier_cleanup(notifier);
 661     }
 662
 663     return 0;
 664 }
 665
 666 static bool virtio_pci_query_guest_notifiers(void *opaque)
 667 {
 668     VirtIOPCIProxy *proxy = opaque;
 669     return msix_enabled(&proxy->pci_dev);
 670 }
 671
 672 static int virtio_pci_set_guest_notifiers(void *opaque, bool assign)
 673 {
 674     VirtIOPCIProxy *proxy = opaque;
 675     VirtIODevice *vdev = proxy->vdev;
 676     int r, n;
 677
 678     /* Must unset vector notifier while guest notifier is still assigned */
 679     if (kvm_irqchip_in_kernel() && !assign) {
 680         msix_unset_vector_notifiers(&proxy->pci_dev);
 681         g_free(proxy->vector_irqfd);
 682         proxy->vector_irqfd = NULL;
 683     }
 684
 685     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 686         if (!virtio_queue_get_num(vdev, n)) {
 687             break;
 688         }
 689
 690         r = virtio_pci_set_guest_notifier(opaque, n, assign);
 691         if (r < 0) {
 692             goto assign_error;
 693         }
 694     }
 695
 696     /* Must set vector notifier after guest notifier has been assigned */
 697     if (kvm_irqchip_in_kernel() && assign) {
 698         proxy->vector_irqfd =
 699             g_malloc0(sizeof(*proxy->vector_irqfd) *
 700                       msix_nr_vectors_allocated(&proxy->pci_dev));
 701         r = msix_set_vector_notifiers(&proxy->pci_dev,
 702                                       kvm_virtio_pci_vector_use,
 703                                       kvm_virtio_pci_vector_release);
 704         if (r < 0) {
 705             goto assign_error;
 706         }
 707     }
 708
 709     return 0;
 710
 711 assign_error:
 712     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
 713     assert(assign);
 714     while (--n >= 0) {
 715         virtio_pci_set_guest_notifier(opaque, n, !assign);
 716     }
 717     return r;
 718 }
 719
 720 static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign)
 721 {
 722     VirtIOPCIProxy *proxy = opaque;
 723
 724     /* Stop using ioeventfd for virtqueue kick if the device starts using host
 725      * notifiers.  This makes it easy to avoid stepping on each others' toes.
 726      */
 727     proxy->ioeventfd_disabled = assign;
 728     if (assign) {
 729         virtio_pci_stop_ioeventfd(proxy);
 730     }
 731     /* We don't need to start here: it's not needed because backend
 732      * currently only stops on status change away from ok,
 733      * reset, vmstop and such. If we do add code to start here,
 734      * need to check vmstate, device state etc. */
 735     return virtio_pci_set_host_notifier_internal(proxy, n, assign);
 736 }
 737
 738 static void virtio_pci_vmstate_change(void *opaque, bool running)
 739 {
 740     VirtIOPCIProxy *proxy = opaque;
 741
 742     if (running) {
 743         /* Try to find out if the guest has bus master disabled, but is
 744            in ready state. Then we have a buggy guest OS. */
 745         if ((proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
 746             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 747             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 748         }
 749         virtio_pci_start_ioeventfd(proxy);
 750     } else {
 751         virtio_pci_stop_ioeventfd(proxy);
 752     }
 753 }
 754
 755 static const VirtIOBindings virtio_pci_bindings = {
 756     .notify = virtio_pci_notify,
 757     .save_config = virtio_pci_save_config,
 758     .load_config = virtio_pci_load_config,
 759     .save_queue = virtio_pci_save_queue,
 760     .load_queue = virtio_pci_load_queue,
 761     .get_features = virtio_pci_get_features,
 762     .query_guest_notifiers = virtio_pci_query_guest_notifiers,
 763     .set_host_notifier = virtio_pci_set_host_notifier,
 764     .set_guest_notifiers = virtio_pci_set_guest_notifiers,
 765     .vmstate_change = virtio_pci_vmstate_change,
 766 };
 767
 768 void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev)
 769 {
 770     uint8_t *config;
 771     uint32_t size;
 772
 773     proxy->vdev = vdev;
 774
 775     config = proxy->pci_dev.config;
 776
 777     if (proxy->class_code) {
 778         pci_config_set_class(config, proxy->class_code);
 779     }
 780     pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
 781                  pci_get_word(config + PCI_VENDOR_ID));
 782     pci_set_word(config + PCI_SUBSYSTEM_ID, vdev->device_id);
 783     config[PCI_INTERRUPT_PIN] = 1;
 784
 785     memory_region_init(&proxy->msix_bar, "virtio-msix", 4096);
 786     if (vdev->nvectors && !msix_init(&proxy->pci_dev, vdev->nvectors,
 787                                      &proxy->msix_bar, 1, 0)) {
 788         pci_register_bar(&proxy->pci_dev, 1, PCI_BASE_ADDRESS_SPACE_MEMORY,
 789                          &proxy->msix_bar);
 790     } else
 791         vdev->nvectors = 0;
 792
 793     proxy->pci_dev.config_write = virtio_write_config;
 794
 795     size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len;
 796     if (size & (size-1))
 797         size = 1 << qemu_fls(size);
 798
 799     memory_region_init_io(&proxy->bar, &virtio_pci_config_ops, proxy,
 800                           "virtio-pci", size);
 801     pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
 802                      &proxy->bar);
 803
 804     if (!kvm_has_many_ioeventfds()) {
 805         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
 806     }
 807
 808     virtio_bind_device(vdev, &virtio_pci_bindings, proxy);
 809     proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
 810     proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
 811     proxy->host_features = vdev->get_features(vdev, proxy->host_features);
 812 }
 813
 814 static int virtio_blk_init_pci(PCIDevice *pci_dev)
 815 {
 816     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 817     VirtIODevice *vdev;
 818
 819     if (proxy->class_code != PCI_CLASS_STORAGE_SCSI &&
 820         proxy->class_code != PCI_CLASS_STORAGE_OTHER)
 821         proxy->class_code = PCI_CLASS_STORAGE_SCSI;
 822
 823     vdev = virtio_blk_init(&pci_dev->qdev, &proxy->blk);
 824     if (!vdev) {
 825         return -1;
 826     }
 827     vdev->nvectors = proxy->nvectors;
 828     virtio_init_pci(proxy, vdev);
 829     /* make the actual value visible */
 830     proxy->nvectors = vdev->nvectors;
 831     return 0;
 832 }
 833
 834 static int virtio_exit_pci(PCIDevice *pci_dev)
 835 {
 836     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 837     int r;
 838
 839     memory_region_destroy(&proxy->bar);
 840     r = msix_uninit(pci_dev, &proxy->msix_bar);
 841     memory_region_destroy(&proxy->msix_bar);
 842     return r;
 843 }
 844
 845 static int virtio_blk_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_blk_exit(proxy->vdev);
 851     return virtio_exit_pci(pci_dev);
 852 }
 853
 854 static int virtio_serial_init_pci(PCIDevice *pci_dev)
 855 {
 856     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 857     VirtIODevice *vdev;
 858
 859     if (proxy->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
 860         proxy->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
 861         proxy->class_code != PCI_CLASS_OTHERS)          /* qemu-kvm  */
 862         proxy->class_code = PCI_CLASS_COMMUNICATION_OTHER;
 863
 864     vdev = virtio_serial_init(&pci_dev->qdev, &proxy->serial);
 865     if (!vdev) {
 866         return -1;
 867     }
 868     vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED
 869                                         ? proxy->serial.max_virtserial_ports + 1
 870                                         : proxy->nvectors;
 871     virtio_init_pci(proxy, vdev);
 872     proxy->nvectors = vdev->nvectors;
 873     return 0;
 874 }
 875
 876 static int virtio_serial_exit_pci(PCIDevice *pci_dev)
 877 {
 878     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 879
 880     virtio_pci_stop_ioeventfd(proxy);
 881     virtio_serial_exit(proxy->vdev);
 882     return virtio_exit_pci(pci_dev);
 883 }
 884
 885 static int virtio_net_init_pci(PCIDevice *pci_dev)
 886 {
 887     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 888     VirtIODevice *vdev;
 889
 890     vdev = virtio_net_init(&pci_dev->qdev, &proxy->nic, &proxy->net);
 891
 892     vdev->nvectors = proxy->nvectors;
 893     virtio_init_pci(proxy, vdev);
 894
 895     /* make the actual value visible */
 896     proxy->nvectors = vdev->nvectors;
 897     return 0;
 898 }
 899
 900 static int virtio_net_exit_pci(PCIDevice *pci_dev)
 901 {
 902     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 903
 904     virtio_pci_stop_ioeventfd(proxy);
 905     virtio_net_exit(proxy->vdev);
 906     return virtio_exit_pci(pci_dev);
 907 }
 908
 909 static int virtio_balloon_init_pci(PCIDevice *pci_dev)
 910 {
 911     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 912     VirtIODevice *vdev;
 913
 914     if (proxy->class_code != PCI_CLASS_OTHERS &&
 915         proxy->class_code != PCI_CLASS_MEMORY_RAM) { /* qemu < 1.1 */
 916         proxy->class_code = PCI_CLASS_OTHERS;
 917     }
 918
 919     vdev = virtio_balloon_init(&pci_dev->qdev);
 920     if (!vdev) {
 921         return -1;
 922     }
 923     virtio_init_pci(proxy, vdev);
 924     return 0;
 925 }
 926
 927 static int virtio_balloon_exit_pci(PCIDevice *pci_dev)
 928 {
 929     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 930
 931     virtio_pci_stop_ioeventfd(proxy);
 932     virtio_balloon_exit(proxy->vdev);
 933     return virtio_exit_pci(pci_dev);
 934 }
 935
 936 static Property virtio_blk_properties[] = {
 937     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
 938     DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, blk.conf),
 939     DEFINE_PROP_STRING("serial", VirtIOPCIProxy, blk.serial),
 940 #ifdef __linux__
 941     DEFINE_PROP_BIT("scsi", VirtIOPCIProxy, blk.scsi, 0, true),
 942 #endif
 943     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
 944     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
 945     DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features),
 946     DEFINE_PROP_END_OF_LIST(),
 947 };
 948
 949 static void virtio_blk_class_init(ObjectClass *klass, void *data)
 950 {
 951     DeviceClass *dc = DEVICE_CLASS(klass);
 952     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 953
 954     k->init = virtio_blk_init_pci;
 955     k->exit = virtio_blk_exit_pci;
 956     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 957     k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
 958     k->revision = VIRTIO_PCI_ABI_VERSION;
 959     k->class_id = PCI_CLASS_STORAGE_SCSI;
 960     dc->reset = virtio_pci_reset;
 961     dc->props = virtio_blk_properties;
 962 }
 963
 964 static TypeInfo virtio_blk_info = {
 965     .name          = "virtio-blk-pci",
 966     .parent        = TYPE_PCI_DEVICE,
 967     .instance_size = sizeof(VirtIOPCIProxy),
 968     .class_init    = virtio_blk_class_init,
 969 };
 970
 971 static Property virtio_net_properties[] = {
 972     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
 973     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
 974     DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features),
 975     DEFINE_NIC_PROPERTIES(VirtIOPCIProxy, nic),
 976     DEFINE_PROP_UINT32("x-txtimer", VirtIOPCIProxy, net.txtimer, TX_TIMER_INTERVAL),
 977     DEFINE_PROP_INT32("x-txburst", VirtIOPCIProxy, net.txburst, TX_BURST),
 978     DEFINE_PROP_STRING("tx", VirtIOPCIProxy, net.tx),
 979     DEFINE_PROP_END_OF_LIST(),
 980 };
 981
 982 static void virtio_net_class_init(ObjectClass *klass, void *data)
 983 {
 984     DeviceClass *dc = DEVICE_CLASS(klass);
 985     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 986
 987     k->init = virtio_net_init_pci;
 988     k->exit = virtio_net_exit_pci;
 989     k->romfile = "pxe-virtio.rom";
 990     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 991     k->device_id = PCI_DEVICE_ID_VIRTIO_NET;
 992     k->revision = VIRTIO_PCI_ABI_VERSION;
 993     k->class_id = PCI_CLASS_NETWORK_ETHERNET;
 994     dc->reset = virtio_pci_reset;
 995     dc->props = virtio_net_properties;
 996 }
 997
 998 static TypeInfo virtio_net_info = {
 999     .name          = "virtio-net-pci",
1000     .parent        = TYPE_PCI_DEVICE,
1001     .instance_size = sizeof(VirtIOPCIProxy),
1002     .class_init    = virtio_net_class_init,
1003 };
1004
1005 static Property virtio_serial_properties[] = {
1006     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1007     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, DEV_NVECTORS_UNSPECIFIED),
1008     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1009     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1010     DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, serial.max_virtserial_ports, 31),
1011     DEFINE_PROP_END_OF_LIST(),
1012 };
1013
1014 static void virtio_serial_class_init(ObjectClass *klass, void *data)
1015 {
1016     DeviceClass *dc = DEVICE_CLASS(klass);
1017     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1018
1019     k->init = virtio_serial_init_pci;
1020     k->exit = virtio_serial_exit_pci;
1021     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1022     k->device_id = PCI_DEVICE_ID_VIRTIO_CONSOLE;
1023     k->revision = VIRTIO_PCI_ABI_VERSION;
1024     k->class_id = PCI_CLASS_COMMUNICATION_OTHER;
1025     dc->reset = virtio_pci_reset;
1026     dc->props = virtio_serial_properties;
1027 }
1028
1029 static TypeInfo virtio_serial_info = {
1030     .name          = "virtio-serial-pci",
1031     .parent        = TYPE_PCI_DEVICE,
1032     .instance_size = sizeof(VirtIOPCIProxy),
1033     .class_init    = virtio_serial_class_init,
1034 };
1035
1036 static Property virtio_balloon_properties[] = {
1037     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1038     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1039     DEFINE_PROP_END_OF_LIST(),
1040 };
1041
1042 static void virtio_balloon_class_init(ObjectClass *klass, void *data)
1043 {
1044     DeviceClass *dc = DEVICE_CLASS(klass);
1045     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1046
1047     k->init = virtio_balloon_init_pci;
1048     k->exit = virtio_balloon_exit_pci;
1049     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1050     k->device_id = PCI_DEVICE_ID_VIRTIO_BALLOON;
1051     k->revision = VIRTIO_PCI_ABI_VERSION;
1052     k->class_id = PCI_CLASS_OTHERS;
1053     dc->reset = virtio_pci_reset;
1054     dc->props = virtio_balloon_properties;
1055 }
1056
1057 static TypeInfo virtio_balloon_info = {
1058     .name          = "virtio-balloon-pci",
1059     .parent        = TYPE_PCI_DEVICE,
1060     .instance_size = sizeof(VirtIOPCIProxy),
1061     .class_init    = virtio_balloon_class_init,
1062 };
1063
1064 static int virtio_scsi_init_pci(PCIDevice *pci_dev)
1065 {
1066     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1067     VirtIODevice *vdev;
1068
1069     vdev = virtio_scsi_init(&pci_dev->qdev, &proxy->scsi);
1070     if (!vdev) {
1071         return -EINVAL;
1072     }
1073
1074     vdev->nvectors = 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 int 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     return virtio_exit_pci(pci_dev);
1088 }
1089
1090 static Property virtio_scsi_properties[] = {
1091     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1092     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOPCIProxy, host_features, scsi),
1093     DEFINE_PROP_END_OF_LIST(),
1094 };
1095
1096 static void virtio_scsi_class_init(ObjectClass *klass, void *data)
1097 {
1098     DeviceClass *dc = DEVICE_CLASS(klass);
1099     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1100
1101     k->init = virtio_scsi_init_pci;
1102     k->exit = virtio_scsi_exit_pci;
1103     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1104     k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1105     k->revision = 0x00;
1106     k->class_id = PCI_CLASS_STORAGE_SCSI;
1107     dc->reset = virtio_pci_reset;
1108     dc->props = virtio_scsi_properties;
1109 }
1110
1111 static TypeInfo virtio_scsi_info = {
1112     .name          = "virtio-scsi-pci",
1113     .parent        = TYPE_PCI_DEVICE,
1114     .instance_size = sizeof(VirtIOPCIProxy),
1115     .class_init    = virtio_scsi_class_init,
1116 };
1117
1118 static void virtio_pci_register_types(void)
1119 {
1120     type_register_static(&virtio_blk_info);
1121     type_register_static(&virtio_net_info);
1122     type_register_static(&virtio_serial_info);
1123     type_register_static(&virtio_balloon_info);
1124     type_register_static(&virtio_scsi_info);
1125 }
1126
1127 type_init(virtio_pci_register_types)