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 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */
 100 static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d)
 101 {
 102     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 103 }
 104
 105 /* DeviceState to VirtIOPCIProxy. Note: used on datapath,
 106  * be careful and test performance if you change this.
 107  */
 108 static inline VirtIOPCIProxy *to_virtio_pci_proxy_fast(DeviceState *d)
 109 {
 110     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 111 }
 112
 113 static void virtio_pci_notify(DeviceState *d, uint16_t vector)
 114 {
 115     VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(d);
 116     if (msix_enabled(&proxy->pci_dev))
 117         msix_notify(&proxy->pci_dev, vector);
 118     else
 119         qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
 120 }
 121
 122 static void virtio_pci_save_config(DeviceState *d, QEMUFile *f)
 123 {
 124     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 125     pci_device_save(&proxy->pci_dev, f);
 126     msix_save(&proxy->pci_dev, f);
 127     if (msix_present(&proxy->pci_dev))
 128         qemu_put_be16(f, proxy->vdev->config_vector);
 129 }
 130
 131 static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f)
 132 {
 133     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 134     if (msix_present(&proxy->pci_dev))
 135         qemu_put_be16(f, virtio_queue_vector(proxy->vdev, n));
 136 }
 137
 138 static int virtio_pci_load_config(DeviceState *d, QEMUFile *f)
 139 {
 140     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 141     int ret;
 142     ret = pci_device_load(&proxy->pci_dev, f);
 143     if (ret) {
 144         return ret;
 145     }
 146     msix_unuse_all_vectors(&proxy->pci_dev);
 147     msix_load(&proxy->pci_dev, f);
 148     if (msix_present(&proxy->pci_dev)) {
 149         qemu_get_be16s(f, &proxy->vdev->config_vector);
 150     } else {
 151         proxy->vdev->config_vector = VIRTIO_NO_VECTOR;
 152     }
 153     if (proxy->vdev->config_vector != VIRTIO_NO_VECTOR) {
 154         return msix_vector_use(&proxy->pci_dev, proxy->vdev->config_vector);
 155     }
 156     return 0;
 157 }
 158
 159 static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f)
 160 {
 161     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 162     uint16_t vector;
 163     if (msix_present(&proxy->pci_dev)) {
 164         qemu_get_be16s(f, &vector);
 165     } else {
 166         vector = VIRTIO_NO_VECTOR;
 167     }
 168     virtio_queue_set_vector(proxy->vdev, n, vector);
 169     if (vector != VIRTIO_NO_VECTOR) {
 170         return msix_vector_use(&proxy->pci_dev, vector);
 171     }
 172     return 0;
 173 }
 174
 175 static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy,
 176                                                  int n, bool assign, bool set_handler)
 177 {
 178     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 179     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
 180     int r = 0;
 181
 182     if (assign) {
 183         r = event_notifier_init(notifier, 1);
 184         if (r < 0) {
 185             error_report("%s: unable to init event notifier: %d",
 186                          __func__, r);
 187             return r;
 188         }
 189         virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
 190         memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 191                                   true, n, notifier);
 192     } else {
 193         memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 194                                   true, n, notifier);
 195         virtio_queue_set_host_notifier_fd_handler(vq, false, false);
 196         event_notifier_cleanup(notifier);
 197     }
 198     return r;
 199 }
 200
 201 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
 202 {
 203     int n, r;
 204
 205     if (!(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) ||
 206         proxy->ioeventfd_disabled ||
 207         proxy->ioeventfd_started) {
 208         return;
 209     }
 210
 211     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 212         if (!virtio_queue_get_num(proxy->vdev, n)) {
 213             continue;
 214         }
 215
 216         r = virtio_pci_set_host_notifier_internal(proxy, n, true, true);
 217         if (r < 0) {
 218             goto assign_error;
 219         }
 220     }
 221     proxy->ioeventfd_started = true;
 222     return;
 223
 224 assign_error:
 225     while (--n >= 0) {
 226         if (!virtio_queue_get_num(proxy->vdev, n)) {
 227             continue;
 228         }
 229
 230         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 231         assert(r >= 0);
 232     }
 233     proxy->ioeventfd_started = false;
 234     error_report("%s: failed. Fallback to a userspace (slower).", __func__);
 235 }
 236
 237 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
 238 {
 239     int r;
 240     int n;
 241
 242     if (!proxy->ioeventfd_started) {
 243         return;
 244     }
 245
 246     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 247         if (!virtio_queue_get_num(proxy->vdev, n)) {
 248             continue;
 249         }
 250
 251         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 252         assert(r >= 0);
 253     }
 254     proxy->ioeventfd_started = false;
 255 }
 256
 257 void virtio_pci_reset(DeviceState *d)
 258 {
 259     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 260     virtio_pci_stop_ioeventfd(proxy);
 261     virtio_reset(proxy->vdev);
 262     msix_unuse_all_vectors(&proxy->pci_dev);
 263     proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 264 }
 265
 266 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 267 {
 268     VirtIOPCIProxy *proxy = opaque;
 269     VirtIODevice *vdev = proxy->vdev;
 270     hwaddr pa;
 271
 272     switch (addr) {
 273     case VIRTIO_PCI_GUEST_FEATURES:
 274         /* Guest does not negotiate properly?  We have to assume nothing. */
 275         if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
 276             val = vdev->bad_features ? vdev->bad_features(vdev) : 0;
 277         }
 278         virtio_set_features(vdev, val);
 279         break;
 280     case VIRTIO_PCI_QUEUE_PFN:
 281         pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 282         if (pa == 0) {
 283             virtio_pci_stop_ioeventfd(proxy);
 284             virtio_reset(proxy->vdev);
 285             msix_unuse_all_vectors(&proxy->pci_dev);
 286         }
 287         else
 288             virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
 289         break;
 290     case VIRTIO_PCI_QUEUE_SEL:
 291         if (val < VIRTIO_PCI_QUEUE_MAX)
 292             vdev->queue_sel = val;
 293         break;
 294     case VIRTIO_PCI_QUEUE_NOTIFY:
 295         if (val < VIRTIO_PCI_QUEUE_MAX) {
 296             virtio_queue_notify(vdev, val);
 297         }
 298         break;
 299     case VIRTIO_PCI_STATUS:
 300         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
 301             virtio_pci_stop_ioeventfd(proxy);
 302         }
 303
 304         virtio_set_status(vdev, val & 0xFF);
 305
 306         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
 307             virtio_pci_start_ioeventfd(proxy);
 308         }
 309
 310         if (vdev->status == 0) {
 311             virtio_reset(proxy->vdev);
 312             msix_unuse_all_vectors(&proxy->pci_dev);
 313         }
 314
 315         /* Linux before 2.6.34 sets the device as OK without enabling
 316            the PCI device bus master bit. In this case we need to disable
 317            some safety checks. */
 318         if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
 319             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 320             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 321         }
 322         break;
 323     case VIRTIO_MSI_CONFIG_VECTOR:
 324         msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
 325         /* Make it possible for guest to discover an error took place. */
 326         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 327             val = VIRTIO_NO_VECTOR;
 328         vdev->config_vector = val;
 329         break;
 330     case VIRTIO_MSI_QUEUE_VECTOR:
 331         msix_vector_unuse(&proxy->pci_dev,
 332                           virtio_queue_vector(vdev, vdev->queue_sel));
 333         /* Make it possible for guest to discover an error took place. */
 334         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 335             val = VIRTIO_NO_VECTOR;
 336         virtio_queue_set_vector(vdev, vdev->queue_sel, val);
 337         break;
 338     default:
 339         error_report("%s: unexpected address 0x%x value 0x%x",
 340                      __func__, addr, val);
 341         break;
 342     }
 343 }
 344
 345 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
 346 {
 347     VirtIODevice *vdev = proxy->vdev;
 348     uint32_t ret = 0xFFFFFFFF;
 349
 350     switch (addr) {
 351     case VIRTIO_PCI_HOST_FEATURES:
 352         ret = proxy->host_features;
 353         break;
 354     case VIRTIO_PCI_GUEST_FEATURES:
 355         ret = vdev->guest_features;
 356         break;
 357     case VIRTIO_PCI_QUEUE_PFN:
 358         ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
 359               >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 360         break;
 361     case VIRTIO_PCI_QUEUE_NUM:
 362         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
 363         break;
 364     case VIRTIO_PCI_QUEUE_SEL:
 365         ret = vdev->queue_sel;
 366         break;
 367     case VIRTIO_PCI_STATUS:
 368         ret = vdev->status;
 369         break;
 370     case VIRTIO_PCI_ISR:
 371         /* reading from the ISR also clears it. */
 372         ret = vdev->isr;
 373         vdev->isr = 0;
 374         qemu_set_irq(proxy->pci_dev.irq[0], 0);
 375         break;
 376     case VIRTIO_MSI_CONFIG_VECTOR:
 377         ret = vdev->config_vector;
 378         break;
 379     case VIRTIO_MSI_QUEUE_VECTOR:
 380         ret = virtio_queue_vector(vdev, vdev->queue_sel);
 381         break;
 382     default:
 383         break;
 384     }
 385
 386     return ret;
 387 }
 388
 389 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
 390                                        unsigned size)
 391 {
 392     VirtIOPCIProxy *proxy = opaque;
 393     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 394     uint64_t val = 0;
 395     if (addr < config) {
 396         return virtio_ioport_read(proxy, addr);
 397     }
 398     addr -= config;
 399
 400     switch (size) {
 401     case 1:
 402         val = virtio_config_readb(proxy->vdev, addr);
 403         break;
 404     case 2:
 405         val = virtio_config_readw(proxy->vdev, addr);
 406         if (virtio_is_big_endian()) {
 407             val = bswap16(val);
 408         }
 409         break;
 410     case 4:
 411         val = virtio_config_readl(proxy->vdev, addr);
 412         if (virtio_is_big_endian()) {
 413             val = bswap32(val);
 414         }
 415         break;
 416     }
 417     return val;
 418 }
 419
 420 static void virtio_pci_config_write(void *opaque, hwaddr addr,
 421                                     uint64_t val, unsigned size)
 422 {
 423     VirtIOPCIProxy *proxy = opaque;
 424     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 425     if (addr < config) {
 426         virtio_ioport_write(proxy, addr, val);
 427         return;
 428     }
 429     addr -= config;
 430     /*
 431      * Virtio-PCI is odd. Ioports are LE but config space is target native
 432      * endian.
 433      */
 434     switch (size) {
 435     case 1:
 436         virtio_config_writeb(proxy->vdev, addr, val);
 437         break;
 438     case 2:
 439         if (virtio_is_big_endian()) {
 440             val = bswap16(val);
 441         }
 442         virtio_config_writew(proxy->vdev, addr, val);
 443         break;
 444     case 4:
 445         if (virtio_is_big_endian()) {
 446             val = bswap32(val);
 447         }
 448         virtio_config_writel(proxy->vdev, addr, val);
 449         break;
 450     }
 451 }
 452
 453 static const MemoryRegionOps virtio_pci_config_ops = {
 454     .read = virtio_pci_config_read,
 455     .write = virtio_pci_config_write,
 456     .impl = {
 457         .min_access_size = 1,
 458         .max_access_size = 4,
 459     },
 460     .endianness = DEVICE_LITTLE_ENDIAN,
 461 };
 462
 463 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 464                                 uint32_t val, int len)
 465 {
 466     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 467
 468     pci_default_write_config(pci_dev, address, val, len);
 469
 470     if (range_covers_byte(address, len, PCI_COMMAND) &&
 471         !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER) &&
 472         !(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
 473         virtio_pci_stop_ioeventfd(proxy);
 474         virtio_set_status(proxy->vdev,
 475                           proxy->vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
 476     }
 477 }
 478
 479 static unsigned virtio_pci_get_features(DeviceState *d)
 480 {
 481     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 482     return proxy->host_features;
 483 }
 484
 485 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
 486                                         unsigned int queue_no,
 487                                         unsigned int vector,
 488                                         MSIMessage msg)
 489 {
 490     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 491     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 492     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 493     int ret;
 494
 495     if (irqfd->users == 0) {
 496         ret = kvm_irqchip_add_msi_route(kvm_state, msg);
 497         if (ret < 0) {
 498             return ret;
 499         }
 500         irqfd->virq = ret;
 501     }
 502     irqfd->users++;
 503
 504     ret = kvm_irqchip_add_irqfd_notifier(kvm_state, n, irqfd->virq);
 505     if (ret < 0) {
 506         if (--irqfd->users == 0) {
 507             kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 508         }
 509         return ret;
 510     }
 511     return 0;
 512 }
 513
 514 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
 515                                              unsigned int queue_no,
 516                                              unsigned int vector)
 517 {
 518     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 519     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 520     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 521     int ret;
 522
 523     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, n, irqfd->virq);
 524     assert(ret == 0);
 525
 526     if (--irqfd->users == 0) {
 527         kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 528     }
 529 }
 530
 531 static int kvm_virtio_pci_vector_use(PCIDevice *dev, unsigned vector,
 532                                      MSIMessage msg)
 533 {
 534     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 535     VirtIODevice *vdev = proxy->vdev;
 536     int ret, queue_no;
 537
 538     for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) {
 539         if (!virtio_queue_get_num(vdev, queue_no)) {
 540             break;
 541         }
 542         if (virtio_queue_vector(vdev, queue_no) != vector) {
 543             continue;
 544         }
 545         ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector, msg);
 546         if (ret < 0) {
 547             goto undo;
 548         }
 549     }
 550     return 0;
 551
 552 undo:
 553     while (--queue_no >= 0) {
 554         if (virtio_queue_vector(vdev, queue_no) != vector) {
 555             continue;
 556         }
 557         kvm_virtio_pci_vq_vector_release(proxy, queue_no, vector);
 558     }
 559     return ret;
 560 }
 561
 562 static void kvm_virtio_pci_vector_release(PCIDevice *dev, unsigned vector)
 563 {
 564     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 565     VirtIODevice *vdev = proxy->vdev;
 566     int queue_no;
 567
 568     for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) {
 569         if (!virtio_queue_get_num(vdev, queue_no)) {
 570             break;
 571         }
 572         if (virtio_queue_vector(vdev, queue_no) != vector) {
 573             continue;
 574         }
 575         kvm_virtio_pci_vq_vector_release(proxy, queue_no, vector);
 576     }
 577 }
 578
 579 static void kvm_virtio_pci_vector_poll(PCIDevice *dev,
 580                                        unsigned int vector_start,
 581                                        unsigned int vector_end)
 582 {
 583     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 584     VirtIODevice *vdev = proxy->vdev;
 585     int queue_no;
 586     unsigned int vector;
 587     EventNotifier *notifier;
 588     VirtQueue *vq;
 589
 590     for (queue_no = 0; queue_no < VIRTIO_PCI_QUEUE_MAX; queue_no++) {
 591         if (!virtio_queue_get_num(vdev, queue_no)) {
 592             break;
 593         }
 594         vector = virtio_queue_vector(vdev, queue_no);
 595         if (vector < vector_start || vector >= vector_end ||
 596             !msix_is_masked(dev, vector)) {
 597             continue;
 598         }
 599         vq = virtio_get_queue(vdev, queue_no);
 600         notifier = virtio_queue_get_guest_notifier(vq);
 601         if (event_notifier_test_and_clear(notifier)) {
 602             msix_set_pending(dev, vector);
 603         }
 604     }
 605 }
 606
 607 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
 608                                          bool with_irqfd)
 609 {
 610     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 611     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 612     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 613
 614     if (assign) {
 615         int r = event_notifier_init(notifier, 0);
 616         if (r < 0) {
 617             return r;
 618         }
 619         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
 620     } else {
 621         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
 622         event_notifier_cleanup(notifier);
 623     }
 624
 625     return 0;
 626 }
 627
 628 static bool virtio_pci_query_guest_notifiers(DeviceState *d)
 629 {
 630     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 631     return msix_enabled(&proxy->pci_dev);
 632 }
 633
 634 static int virtio_pci_set_guest_notifiers(DeviceState *d, bool assign)
 635 {
 636     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 637     VirtIODevice *vdev = proxy->vdev;
 638     int r, n;
 639     bool with_irqfd = msix_enabled(&proxy->pci_dev) &&
 640         kvm_msi_via_irqfd_enabled();
 641
 642     /* Must unset vector notifier while guest notifier is still assigned */
 643     if (proxy->vector_irqfd && !assign) {
 644         msix_unset_vector_notifiers(&proxy->pci_dev);
 645         g_free(proxy->vector_irqfd);
 646         proxy->vector_irqfd = NULL;
 647     }
 648
 649     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 650         if (!virtio_queue_get_num(vdev, n)) {
 651             break;
 652         }
 653
 654         r = virtio_pci_set_guest_notifier(d, n, assign,
 655                                           kvm_msi_via_irqfd_enabled());
 656         if (r < 0) {
 657             goto assign_error;
 658         }
 659     }
 660
 661     /* Must set vector notifier after guest notifier has been assigned */
 662     if (with_irqfd && assign) {
 663         proxy->vector_irqfd =
 664             g_malloc0(sizeof(*proxy->vector_irqfd) *
 665                       msix_nr_vectors_allocated(&proxy->pci_dev));
 666         r = msix_set_vector_notifiers(&proxy->pci_dev,
 667                                       kvm_virtio_pci_vector_use,
 668                                       kvm_virtio_pci_vector_release,
 669                                       kvm_virtio_pci_vector_poll);
 670         if (r < 0) {
 671             goto assign_error;
 672         }
 673     }
 674
 675     return 0;
 676
 677 assign_error:
 678     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
 679     assert(assign);
 680     while (--n >= 0) {
 681         virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd);
 682     }
 683     return r;
 684 }
 685
 686 static int virtio_pci_set_host_notifier(DeviceState *d, int n, bool assign)
 687 {
 688     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 689
 690     /* Stop using ioeventfd for virtqueue kick if the device starts using host
 691      * notifiers.  This makes it easy to avoid stepping on each others' toes.
 692      */
 693     proxy->ioeventfd_disabled = assign;
 694     if (assign) {
 695         virtio_pci_stop_ioeventfd(proxy);
 696     }
 697     /* We don't need to start here: it's not needed because backend
 698      * currently only stops on status change away from ok,
 699      * reset, vmstop and such. If we do add code to start here,
 700      * need to check vmstate, device state etc. */
 701     return virtio_pci_set_host_notifier_internal(proxy, n, assign, false);
 702 }
 703
 704 static void virtio_pci_vmstate_change(DeviceState *d, bool running)
 705 {
 706     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 707
 708     if (running) {
 709         /* Try to find out if the guest has bus master disabled, but is
 710            in ready state. Then we have a buggy guest OS. */
 711         if ((proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
 712             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 713             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 714         }
 715         virtio_pci_start_ioeventfd(proxy);
 716     } else {
 717         virtio_pci_stop_ioeventfd(proxy);
 718     }
 719 }
 720
 721 static const VirtIOBindings virtio_pci_bindings = {
 722     .notify = virtio_pci_notify,
 723     .save_config = virtio_pci_save_config,
 724     .load_config = virtio_pci_load_config,
 725     .save_queue = virtio_pci_save_queue,
 726     .load_queue = virtio_pci_load_queue,
 727     .get_features = virtio_pci_get_features,
 728     .query_guest_notifiers = virtio_pci_query_guest_notifiers,
 729     .set_host_notifier = virtio_pci_set_host_notifier,
 730     .set_guest_notifiers = virtio_pci_set_guest_notifiers,
 731     .vmstate_change = virtio_pci_vmstate_change,
 732 };
 733
 734 void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev)
 735 {
 736     uint8_t *config;
 737     uint32_t size;
 738
 739     proxy->vdev = vdev;
 740
 741     config = proxy->pci_dev.config;
 742
 743     if (proxy->class_code) {
 744         pci_config_set_class(config, proxy->class_code);
 745     }
 746     pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
 747                  pci_get_word(config + PCI_VENDOR_ID));
 748     pci_set_word(config + PCI_SUBSYSTEM_ID, vdev->device_id);
 749     config[PCI_INTERRUPT_PIN] = 1;
 750
 751     if (vdev->nvectors &&
 752         msix_init_exclusive_bar(&proxy->pci_dev, vdev->nvectors, 1)) {
 753         vdev->nvectors = 0;
 754     }
 755
 756     proxy->pci_dev.config_write = virtio_write_config;
 757
 758     size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len;
 759     if (size & (size-1))
 760         size = 1 << qemu_fls(size);
 761
 762     memory_region_init_io(&proxy->bar, &virtio_pci_config_ops, proxy,
 763                           "virtio-pci", size);
 764     pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
 765                      &proxy->bar);
 766
 767     if (!kvm_has_many_ioeventfds()) {
 768         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
 769     }
 770
 771     virtio_bind_device(vdev, &virtio_pci_bindings, DEVICE(proxy));
 772     proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
 773     proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
 774     proxy->host_features = vdev->get_features(vdev, proxy->host_features);
 775 }
 776
 777 static int virtio_blk_init_pci(PCIDevice *pci_dev)
 778 {
 779     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 780     VirtIODevice *vdev;
 781
 782     if (proxy->class_code != PCI_CLASS_STORAGE_SCSI &&
 783         proxy->class_code != PCI_CLASS_STORAGE_OTHER)
 784         proxy->class_code = PCI_CLASS_STORAGE_SCSI;
 785
 786     vdev = virtio_blk_init(&pci_dev->qdev, &proxy->blk);
 787     if (!vdev) {
 788         return -1;
 789     }
 790     vdev->nvectors = proxy->nvectors;
 791     virtio_init_pci(proxy, vdev);
 792     /* make the actual value visible */
 793     proxy->nvectors = vdev->nvectors;
 794     return 0;
 795 }
 796
 797 static void virtio_exit_pci(PCIDevice *pci_dev)
 798 {
 799     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 800
 801     memory_region_destroy(&proxy->bar);
 802     msix_uninit_exclusive_bar(pci_dev);
 803 }
 804
 805 static void virtio_blk_exit_pci(PCIDevice *pci_dev)
 806 {
 807     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 808
 809     virtio_pci_stop_ioeventfd(proxy);
 810     virtio_blk_exit(proxy->vdev);
 811     virtio_exit_pci(pci_dev);
 812 }
 813
 814 static int virtio_serial_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_COMMUNICATION_OTHER &&
 820         proxy->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
 821         proxy->class_code != PCI_CLASS_OTHERS)          /* qemu-kvm  */
 822         proxy->class_code = PCI_CLASS_COMMUNICATION_OTHER;
 823
 824     vdev = virtio_serial_init(&pci_dev->qdev, &proxy->serial);
 825     if (!vdev) {
 826         return -1;
 827     }
 828     vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED
 829                                         ? proxy->serial.max_virtserial_ports + 1
 830                                         : proxy->nvectors;
 831     virtio_init_pci(proxy, vdev);
 832     proxy->nvectors = vdev->nvectors;
 833     return 0;
 834 }
 835
 836 static void virtio_serial_exit_pci(PCIDevice *pci_dev)
 837 {
 838     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 839
 840     virtio_pci_stop_ioeventfd(proxy);
 841     virtio_serial_exit(proxy->vdev);
 842     virtio_exit_pci(pci_dev);
 843 }
 844
 845 static int virtio_net_init_pci(PCIDevice *pci_dev)
 846 {
 847     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 848     VirtIODevice *vdev;
 849
 850     vdev = virtio_net_init(&pci_dev->qdev, &proxy->nic, &proxy->net);
 851
 852     vdev->nvectors = proxy->nvectors;
 853     virtio_init_pci(proxy, vdev);
 854
 855     /* make the actual value visible */
 856     proxy->nvectors = vdev->nvectors;
 857     return 0;
 858 }
 859
 860 static void virtio_net_exit_pci(PCIDevice *pci_dev)
 861 {
 862     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 863
 864     virtio_pci_stop_ioeventfd(proxy);
 865     virtio_net_exit(proxy->vdev);
 866     virtio_exit_pci(pci_dev);
 867 }
 868
 869 static int virtio_balloon_init_pci(PCIDevice *pci_dev)
 870 {
 871     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 872     VirtIODevice *vdev;
 873
 874     if (proxy->class_code != PCI_CLASS_OTHERS &&
 875         proxy->class_code != PCI_CLASS_MEMORY_RAM) { /* qemu < 1.1 */
 876         proxy->class_code = PCI_CLASS_OTHERS;
 877     }
 878
 879     vdev = virtio_balloon_init(&pci_dev->qdev);
 880     if (!vdev) {
 881         return -1;
 882     }
 883     virtio_init_pci(proxy, vdev);
 884     return 0;
 885 }
 886
 887 static void virtio_balloon_exit_pci(PCIDevice *pci_dev)
 888 {
 889     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 890
 891     virtio_pci_stop_ioeventfd(proxy);
 892     virtio_balloon_exit(proxy->vdev);
 893     virtio_exit_pci(pci_dev);
 894 }
 895
 896 static int virtio_rng_init_pci(PCIDevice *pci_dev)
 897 {
 898     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 899     VirtIODevice *vdev;
 900
 901     if (proxy->rng.rng == NULL) {
 902         proxy->rng.default_backend = RNG_RANDOM(object_new(TYPE_RNG_RANDOM));
 903
 904         object_property_add_child(OBJECT(pci_dev),
 905                                   "default-backend",
 906                                   OBJECT(proxy->rng.default_backend),
 907                                   NULL);
 908
 909         object_property_set_link(OBJECT(pci_dev),
 910                                  OBJECT(proxy->rng.default_backend),
 911                                  "rng", NULL);
 912     }
 913
 914     vdev = virtio_rng_init(&pci_dev->qdev, &proxy->rng);
 915     if (!vdev) {
 916         return -1;
 917     }
 918     virtio_init_pci(proxy, vdev);
 919     return 0;
 920 }
 921
 922 static void virtio_rng_exit_pci(PCIDevice *pci_dev)
 923 {
 924     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 925
 926     virtio_pci_stop_ioeventfd(proxy);
 927     virtio_rng_exit(proxy->vdev);
 928     virtio_exit_pci(pci_dev);
 929 }
 930
 931 static Property virtio_blk_properties[] = {
 932     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
 933     DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, blk.conf),
 934     DEFINE_BLOCK_CHS_PROPERTIES(VirtIOPCIProxy, blk.conf),
 935     DEFINE_PROP_STRING("serial", VirtIOPCIProxy, blk.serial),
 936 #ifdef __linux__
 937     DEFINE_PROP_BIT("scsi", VirtIOPCIProxy, blk.scsi, 0, true),
 938 #endif
 939     DEFINE_PROP_BIT("config-wce", VirtIOPCIProxy, blk.config_wce, 0, true),
 940     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
 941 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
 942     DEFINE_PROP_BIT("x-data-plane", VirtIOPCIProxy, blk.data_plane, 0, false),
 943 #endif
 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 void virtio_rng_initfn(Object *obj)
1065 {
1066     PCIDevice *pci_dev = PCI_DEVICE(obj);
1067     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1068
1069     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
1070                              (Object **)&proxy->rng.rng, NULL);
1071 }
1072
1073 static Property virtio_rng_properties[] = {
1074     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1075     /* Set a default rate limit of 2^47 bytes per minute or roughly 2TB/s.  If
1076        you have an entropy source capable of generating more entropy than this
1077        and you can pass it through via virtio-rng, then hats off to you.  Until
1078        then, this is unlimited for all practical purposes.
1079     */
1080     DEFINE_PROP_UINT64("max-bytes", VirtIOPCIProxy, rng.max_bytes, INT64_MAX),
1081     DEFINE_PROP_UINT32("period", VirtIOPCIProxy, rng.period_ms, 1 << 16),
1082     DEFINE_PROP_END_OF_LIST(),
1083 };
1084
1085 static void virtio_rng_class_init(ObjectClass *klass, void *data)
1086 {
1087     DeviceClass *dc = DEVICE_CLASS(klass);
1088     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1089
1090     k->init = virtio_rng_init_pci;
1091     k->exit = virtio_rng_exit_pci;
1092     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1093     k->device_id = PCI_DEVICE_ID_VIRTIO_RNG;
1094     k->revision = VIRTIO_PCI_ABI_VERSION;
1095     k->class_id = PCI_CLASS_OTHERS;
1096     dc->reset = virtio_pci_reset;
1097     dc->props = virtio_rng_properties;
1098 }
1099
1100 static TypeInfo virtio_rng_info = {
1101     .name          = "virtio-rng-pci",
1102     .parent        = TYPE_PCI_DEVICE,
1103     .instance_size = sizeof(VirtIOPCIProxy),
1104     .instance_init = virtio_rng_initfn,
1105     .class_init    = virtio_rng_class_init,
1106 };
1107
1108 static int virtio_scsi_init_pci(PCIDevice *pci_dev)
1109 {
1110     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1111     VirtIODevice *vdev;
1112
1113     vdev = virtio_scsi_init(&pci_dev->qdev, &proxy->scsi);
1114     if (!vdev) {
1115         return -EINVAL;
1116     }
1117
1118     vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED
1119                                         ? proxy->scsi.num_queues + 3
1120                                         : proxy->nvectors;
1121     virtio_init_pci(proxy, vdev);
1122
1123     /* make the actual value visible */
1124     proxy->nvectors = vdev->nvectors;
1125     return 0;
1126 }
1127
1128 static void virtio_scsi_exit_pci(PCIDevice *pci_dev)
1129 {
1130     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1131
1132     virtio_scsi_exit(proxy->vdev);
1133     virtio_exit_pci(pci_dev);
1134 }
1135
1136 static Property virtio_scsi_properties[] = {
1137     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1138     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, DEV_NVECTORS_UNSPECIFIED),
1139     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOPCIProxy, host_features, scsi),
1140     DEFINE_PROP_END_OF_LIST(),
1141 };
1142
1143 static void virtio_scsi_class_init(ObjectClass *klass, void *data)
1144 {
1145     DeviceClass *dc = DEVICE_CLASS(klass);
1146     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1147
1148     k->init = virtio_scsi_init_pci;
1149     k->exit = virtio_scsi_exit_pci;
1150     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1151     k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1152     k->revision = 0x00;
1153     k->class_id = PCI_CLASS_STORAGE_SCSI;
1154     dc->reset = virtio_pci_reset;
1155     dc->props = virtio_scsi_properties;
1156 }
1157
1158 static TypeInfo virtio_scsi_info = {
1159     .name          = "virtio-scsi-pci",
1160     .parent        = TYPE_PCI_DEVICE,
1161     .instance_size = sizeof(VirtIOPCIProxy),
1162     .class_init    = virtio_scsi_class_init,
1163 };
1164
1165 static void virtio_pci_register_types(void)
1166 {
1167     type_register_static(&virtio_blk_info);
1168     type_register_static(&virtio_net_info);
1169     type_register_static(&virtio_serial_info);
1170     type_register_static(&virtio_balloon_info);
1171     type_register_static(&virtio_scsi_info);
1172     type_register_static(&virtio_rng_info);
1173 }
1174
1175 type_init(virtio_pci_register_types)