hw/virtio/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 "hw/virtio/virtio.h"
  21 #include "hw/virtio/virtio-blk.h"
  22 #include "hw/virtio/virtio-net.h"
  23 #include "hw/virtio/virtio-serial.h"
  24 #include "hw/virtio/virtio-scsi.h"
  25 #include "hw/virtio/virtio-balloon.h"
  26 #include "hw/pci/pci.h"
  27 #include "qemu/error-report.h"
  28 #include "hw/pci/msi.h"
  29 #include "hw/pci/msix.h"
  30 #include "hw/loader.h"
  31 #include "sysemu/kvm.h"
  32 #include "sysemu/blockdev.h"
  33 #include "virtio-pci.h"
  34 #include "qemu/range.h"
  35 #include "hw/virtio/virtio-bus.h"
  36 #include "qapi/visitor.h"
  37
  38 /* from Linux's linux/virtio_pci.h */
  39
  40 /* A 32-bit r/o bitmask of the features supported by the host */
  41 #define VIRTIO_PCI_HOST_FEATURES        0
  42
  43 /* A 32-bit r/w bitmask of features activated by the guest */
  44 #define VIRTIO_PCI_GUEST_FEATURES       4
  45
  46 /* A 32-bit r/w PFN for the currently selected queue */
  47 #define VIRTIO_PCI_QUEUE_PFN            8
  48
  49 /* A 16-bit r/o queue size for the currently selected queue */
  50 #define VIRTIO_PCI_QUEUE_NUM            12
  51
  52 /* A 16-bit r/w queue selector */
  53 #define VIRTIO_PCI_QUEUE_SEL            14
  54
  55 /* A 16-bit r/w queue notifier */
  56 #define VIRTIO_PCI_QUEUE_NOTIFY         16
  57
  58 /* An 8-bit device status register.  */
  59 #define VIRTIO_PCI_STATUS               18
  60
  61 /* An 8-bit r/o interrupt status register.  Reading the value will return the
  62  * current contents of the ISR and will also clear it.  This is effectively
  63  * a read-and-acknowledge. */
  64 #define VIRTIO_PCI_ISR                  19
  65
  66 /* MSI-X registers: only enabled if MSI-X is enabled. */
  67 /* A 16-bit vector for configuration changes. */
  68 #define VIRTIO_MSI_CONFIG_VECTOR        20
  69 /* A 16-bit vector for selected queue notifications. */
  70 #define VIRTIO_MSI_QUEUE_VECTOR         22
  71
  72 /* Config space size */
  73 #define VIRTIO_PCI_CONFIG_NOMSI         20
  74 #define VIRTIO_PCI_CONFIG_MSI           24
  75 #define VIRTIO_PCI_REGION_SIZE(dev)     (msix_present(dev) ? \
  76                                          VIRTIO_PCI_CONFIG_MSI : \
  77                                          VIRTIO_PCI_CONFIG_NOMSI)
  78
  79 /* The remaining space is defined by each driver as the per-driver
  80  * configuration space */
  81 #define VIRTIO_PCI_CONFIG(dev)          (msix_enabled(dev) ? \
  82                                          VIRTIO_PCI_CONFIG_MSI : \
  83                                          VIRTIO_PCI_CONFIG_NOMSI)
  84
  85 /* How many bits to shift physical queue address written to QUEUE_PFN.
  86  * 12 is historical, and due to x86 page size. */
  87 #define VIRTIO_PCI_QUEUE_ADDR_SHIFT    12
  88
  89 /* Flags track per-device state like workarounds for quirks in older guests. */
  90 #define VIRTIO_PCI_FLAG_BUS_MASTER_BUG  (1 << 0)
  91
  92 /* HACK for virtio to determine if it's running a big endian guest */
  93 bool virtio_is_big_endian(void);
  94
  95 static void virtio_pci_bus_new(VirtioBusState *bus, VirtIOPCIProxy *dev);
  96
  97 /* virtio device */
  98 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */
  99 static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d)
 100 {
 101     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 102 }
 103
 104 /* DeviceState to VirtIOPCIProxy. Note: used on datapath,
 105  * be careful and test performance if you change this.
 106  */
 107 static inline VirtIOPCIProxy *to_virtio_pci_proxy_fast(DeviceState *d)
 108 {
 109     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 110 }
 111
 112 static void virtio_pci_notify(DeviceState *d, uint16_t vector)
 113 {
 114     VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(d);
 115     if (msix_enabled(&proxy->pci_dev))
 116         msix_notify(&proxy->pci_dev, vector);
 117     else
 118         qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
 119 }
 120
 121 static void virtio_pci_save_config(DeviceState *d, QEMUFile *f)
 122 {
 123     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 124     pci_device_save(&proxy->pci_dev, f);
 125     msix_save(&proxy->pci_dev, f);
 126     if (msix_present(&proxy->pci_dev))
 127         qemu_put_be16(f, proxy->vdev->config_vector);
 128 }
 129
 130 static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f)
 131 {
 132     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 133     if (msix_present(&proxy->pci_dev))
 134         qemu_put_be16(f, virtio_queue_vector(proxy->vdev, n));
 135 }
 136
 137 static int virtio_pci_load_config(DeviceState *d, QEMUFile *f)
 138 {
 139     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 140     int ret;
 141     ret = pci_device_load(&proxy->pci_dev, f);
 142     if (ret) {
 143         return ret;
 144     }
 145     msix_unuse_all_vectors(&proxy->pci_dev);
 146     msix_load(&proxy->pci_dev, f);
 147     if (msix_present(&proxy->pci_dev)) {
 148         qemu_get_be16s(f, &proxy->vdev->config_vector);
 149     } else {
 150         proxy->vdev->config_vector = VIRTIO_NO_VECTOR;
 151     }
 152     if (proxy->vdev->config_vector != VIRTIO_NO_VECTOR) {
 153         return msix_vector_use(&proxy->pci_dev, proxy->vdev->config_vector);
 154     }
 155     return 0;
 156 }
 157
 158 static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f)
 159 {
 160     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 161     uint16_t vector;
 162     if (msix_present(&proxy->pci_dev)) {
 163         qemu_get_be16s(f, &vector);
 164     } else {
 165         vector = VIRTIO_NO_VECTOR;
 166     }
 167     virtio_queue_set_vector(proxy->vdev, n, vector);
 168     if (vector != VIRTIO_NO_VECTOR) {
 169         return msix_vector_use(&proxy->pci_dev, vector);
 170     }
 171     return 0;
 172 }
 173
 174 static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy,
 175                                                  int n, bool assign, bool set_handler)
 176 {
 177     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 178     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
 179     int r = 0;
 180
 181     if (assign) {
 182         r = event_notifier_init(notifier, 1);
 183         if (r < 0) {
 184             error_report("%s: unable to init event notifier: %d",
 185                          __func__, r);
 186             return r;
 187         }
 188         virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
 189         memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 190                                   true, n, notifier);
 191     } else {
 192         memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 193                                   true, n, notifier);
 194         virtio_queue_set_host_notifier_fd_handler(vq, false, false);
 195         event_notifier_cleanup(notifier);
 196     }
 197     return r;
 198 }
 199
 200 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
 201 {
 202     int n, r;
 203
 204     if (!(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) ||
 205         proxy->ioeventfd_disabled ||
 206         proxy->ioeventfd_started) {
 207         return;
 208     }
 209
 210     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 211         if (!virtio_queue_get_num(proxy->vdev, n)) {
 212             continue;
 213         }
 214
 215         r = virtio_pci_set_host_notifier_internal(proxy, n, true, true);
 216         if (r < 0) {
 217             goto assign_error;
 218         }
 219     }
 220     proxy->ioeventfd_started = true;
 221     return;
 222
 223 assign_error:
 224     while (--n >= 0) {
 225         if (!virtio_queue_get_num(proxy->vdev, n)) {
 226             continue;
 227         }
 228
 229         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 230         assert(r >= 0);
 231     }
 232     proxy->ioeventfd_started = false;
 233     error_report("%s: failed. Fallback to a userspace (slower).", __func__);
 234 }
 235
 236 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
 237 {
 238     int r;
 239     int n;
 240
 241     if (!proxy->ioeventfd_started) {
 242         return;
 243     }
 244
 245     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 246         if (!virtio_queue_get_num(proxy->vdev, n)) {
 247             continue;
 248         }
 249
 250         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 251         assert(r >= 0);
 252     }
 253     proxy->ioeventfd_started = false;
 254 }
 255
 256 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 257 {
 258     VirtIOPCIProxy *proxy = opaque;
 259     VirtIODevice *vdev = proxy->vdev;
 260     hwaddr pa;
 261
 262     switch (addr) {
 263     case VIRTIO_PCI_GUEST_FEATURES:
 264         /* Guest does not negotiate properly?  We have to assume nothing. */
 265         if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
 266             val = virtio_bus_get_vdev_bad_features(&proxy->bus);
 267         }
 268         virtio_set_features(vdev, val);
 269         break;
 270     case VIRTIO_PCI_QUEUE_PFN:
 271         pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 272         if (pa == 0) {
 273             virtio_pci_stop_ioeventfd(proxy);
 274             virtio_reset(proxy->vdev);
 275             msix_unuse_all_vectors(&proxy->pci_dev);
 276         }
 277         else
 278             virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
 279         break;
 280     case VIRTIO_PCI_QUEUE_SEL:
 281         if (val < VIRTIO_PCI_QUEUE_MAX)
 282             vdev->queue_sel = val;
 283         break;
 284     case VIRTIO_PCI_QUEUE_NOTIFY:
 285         if (val < VIRTIO_PCI_QUEUE_MAX) {
 286             virtio_queue_notify(vdev, val);
 287         }
 288         break;
 289     case VIRTIO_PCI_STATUS:
 290         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
 291             virtio_pci_stop_ioeventfd(proxy);
 292         }
 293
 294         virtio_set_status(vdev, val & 0xFF);
 295
 296         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
 297             virtio_pci_start_ioeventfd(proxy);
 298         }
 299
 300         if (vdev->status == 0) {
 301             virtio_reset(proxy->vdev);
 302             msix_unuse_all_vectors(&proxy->pci_dev);
 303         }
 304
 305         /* Linux before 2.6.34 sets the device as OK without enabling
 306            the PCI device bus master bit. In this case we need to disable
 307            some safety checks. */
 308         if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
 309             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 310             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 311         }
 312         break;
 313     case VIRTIO_MSI_CONFIG_VECTOR:
 314         msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
 315         /* Make it possible for guest to discover an error took place. */
 316         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 317             val = VIRTIO_NO_VECTOR;
 318         vdev->config_vector = val;
 319         break;
 320     case VIRTIO_MSI_QUEUE_VECTOR:
 321         msix_vector_unuse(&proxy->pci_dev,
 322                           virtio_queue_vector(vdev, vdev->queue_sel));
 323         /* Make it possible for guest to discover an error took place. */
 324         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 325             val = VIRTIO_NO_VECTOR;
 326         virtio_queue_set_vector(vdev, vdev->queue_sel, val);
 327         break;
 328     default:
 329         error_report("%s: unexpected address 0x%x value 0x%x",
 330                      __func__, addr, val);
 331         break;
 332     }
 333 }
 334
 335 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
 336 {
 337     VirtIODevice *vdev = proxy->vdev;
 338     uint32_t ret = 0xFFFFFFFF;
 339
 340     switch (addr) {
 341     case VIRTIO_PCI_HOST_FEATURES:
 342         ret = proxy->host_features;
 343         break;
 344     case VIRTIO_PCI_GUEST_FEATURES:
 345         ret = vdev->guest_features;
 346         break;
 347     case VIRTIO_PCI_QUEUE_PFN:
 348         ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
 349               >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 350         break;
 351     case VIRTIO_PCI_QUEUE_NUM:
 352         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
 353         break;
 354     case VIRTIO_PCI_QUEUE_SEL:
 355         ret = vdev->queue_sel;
 356         break;
 357     case VIRTIO_PCI_STATUS:
 358         ret = vdev->status;
 359         break;
 360     case VIRTIO_PCI_ISR:
 361         /* reading from the ISR also clears it. */
 362         ret = vdev->isr;
 363         vdev->isr = 0;
 364         qemu_set_irq(proxy->pci_dev.irq[0], 0);
 365         break;
 366     case VIRTIO_MSI_CONFIG_VECTOR:
 367         ret = vdev->config_vector;
 368         break;
 369     case VIRTIO_MSI_QUEUE_VECTOR:
 370         ret = virtio_queue_vector(vdev, vdev->queue_sel);
 371         break;
 372     default:
 373         break;
 374     }
 375
 376     return ret;
 377 }
 378
 379 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
 380                                        unsigned size)
 381 {
 382     VirtIOPCIProxy *proxy = opaque;
 383     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 384     uint64_t val = 0;
 385     if (addr < config) {
 386         return virtio_ioport_read(proxy, addr);
 387     }
 388     addr -= config;
 389
 390     switch (size) {
 391     case 1:
 392         val = virtio_config_readb(proxy->vdev, addr);
 393         break;
 394     case 2:
 395         val = virtio_config_readw(proxy->vdev, addr);
 396         if (virtio_is_big_endian()) {
 397             val = bswap16(val);
 398         }
 399         break;
 400     case 4:
 401         val = virtio_config_readl(proxy->vdev, addr);
 402         if (virtio_is_big_endian()) {
 403             val = bswap32(val);
 404         }
 405         break;
 406     }
 407     return val;
 408 }
 409
 410 static void virtio_pci_config_write(void *opaque, hwaddr addr,
 411                                     uint64_t val, unsigned size)
 412 {
 413     VirtIOPCIProxy *proxy = opaque;
 414     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 415     if (addr < config) {
 416         virtio_ioport_write(proxy, addr, val);
 417         return;
 418     }
 419     addr -= config;
 420     /*
 421      * Virtio-PCI is odd. Ioports are LE but config space is target native
 422      * endian.
 423      */
 424     switch (size) {
 425     case 1:
 426         virtio_config_writeb(proxy->vdev, addr, val);
 427         break;
 428     case 2:
 429         if (virtio_is_big_endian()) {
 430             val = bswap16(val);
 431         }
 432         virtio_config_writew(proxy->vdev, addr, val);
 433         break;
 434     case 4:
 435         if (virtio_is_big_endian()) {
 436             val = bswap32(val);
 437         }
 438         virtio_config_writel(proxy->vdev, addr, val);
 439         break;
 440     }
 441 }
 442
 443 static const MemoryRegionOps virtio_pci_config_ops = {
 444     .read = virtio_pci_config_read,
 445     .write = virtio_pci_config_write,
 446     .impl = {
 447         .min_access_size = 1,
 448         .max_access_size = 4,
 449     },
 450     .endianness = DEVICE_LITTLE_ENDIAN,
 451 };
 452
 453 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 454                                 uint32_t val, int len)
 455 {
 456     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 457
 458     pci_default_write_config(pci_dev, address, val, len);
 459
 460     if (range_covers_byte(address, len, PCI_COMMAND) &&
 461         !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER) &&
 462         !(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
 463         virtio_pci_stop_ioeventfd(proxy);
 464         virtio_set_status(proxy->vdev,
 465                           proxy->vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
 466     }
 467 }
 468
 469 static unsigned virtio_pci_get_features(DeviceState *d)
 470 {
 471     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 472     return proxy->host_features;
 473 }
 474
 475 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
 476                                         unsigned int queue_no,
 477                                         unsigned int vector,
 478                                         MSIMessage msg)
 479 {
 480     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 481     int ret;
 482
 483     if (irqfd->users == 0) {
 484         ret = kvm_irqchip_add_msi_route(kvm_state, msg);
 485         if (ret < 0) {
 486             return ret;
 487         }
 488         irqfd->virq = ret;
 489     }
 490     irqfd->users++;
 491     return 0;
 492 }
 493
 494 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
 495                                              unsigned int vector)
 496 {
 497     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 498     if (--irqfd->users == 0) {
 499         kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 500     }
 501 }
 502
 503 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
 504                                  unsigned int queue_no,
 505                                  unsigned int vector)
 506 {
 507     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 508     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 509     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 510     int ret;
 511     ret = kvm_irqchip_add_irqfd_notifier(kvm_state, n, irqfd->virq);
 512     return ret;
 513 }
 514
 515 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
 516                                       unsigned int queue_no,
 517                                       unsigned int vector)
 518 {
 519     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 520     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 521     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 522     int ret;
 523
 524     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, n, irqfd->virq);
 525     assert(ret == 0);
 526 }
 527
 528 static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
 529 {
 530     PCIDevice *dev = &proxy->pci_dev;
 531     VirtIODevice *vdev = proxy->vdev;
 532     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 533     unsigned int vector;
 534     int ret, queue_no;
 535     MSIMessage msg;
 536
 537     for (queue_no = 0; queue_no < nvqs; queue_no++) {
 538         if (!virtio_queue_get_num(vdev, queue_no)) {
 539             break;
 540         }
 541         vector = virtio_queue_vector(vdev, queue_no);
 542         if (vector >= msix_nr_vectors_allocated(dev)) {
 543             continue;
 544         }
 545         msg = msix_get_message(dev, vector);
 546         ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector, msg);
 547         if (ret < 0) {
 548             goto undo;
 549         }
 550         /* If guest supports masking, set up irqfd now.
 551          * Otherwise, delay until unmasked in the frontend.
 552          */
 553         if (k->guest_notifier_mask) {
 554             ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
 555             if (ret < 0) {
 556                 kvm_virtio_pci_vq_vector_release(proxy, vector);
 557                 goto undo;
 558             }
 559         }
 560     }
 561     return 0;
 562
 563 undo:
 564     while (--queue_no >= 0) {
 565         vector = virtio_queue_vector(vdev, queue_no);
 566         if (vector >= msix_nr_vectors_allocated(dev)) {
 567             continue;
 568         }
 569         if (k->guest_notifier_mask) {
 570             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 571         }
 572         kvm_virtio_pci_vq_vector_release(proxy, vector);
 573     }
 574     return ret;
 575 }
 576
 577 static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
 578 {
 579     PCIDevice *dev = &proxy->pci_dev;
 580     VirtIODevice *vdev = proxy->vdev;
 581     unsigned int vector;
 582     int queue_no;
 583     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 584
 585     for (queue_no = 0; queue_no < nvqs; queue_no++) {
 586         if (!virtio_queue_get_num(vdev, queue_no)) {
 587             break;
 588         }
 589         vector = virtio_queue_vector(vdev, queue_no);
 590         if (vector >= msix_nr_vectors_allocated(dev)) {
 591             continue;
 592         }
 593         /* If guest supports masking, clean up irqfd now.
 594          * Otherwise, it was cleaned when masked in the frontend.
 595          */
 596         if (k->guest_notifier_mask) {
 597             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 598         }
 599         kvm_virtio_pci_vq_vector_release(proxy, vector);
 600     }
 601 }
 602
 603 static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
 604                                        unsigned int queue_no,
 605                                        unsigned int vector,
 606                                        MSIMessage msg)
 607 {
 608     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(proxy->vdev);
 609     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 610     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 611     VirtIOIRQFD *irqfd;
 612     int ret = 0;
 613
 614     if (proxy->vector_irqfd) {
 615         irqfd = &proxy->vector_irqfd[vector];
 616         if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) {
 617             ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg);
 618             if (ret < 0) {
 619                 return ret;
 620             }
 621         }
 622     }
 623
 624     /* If guest supports masking, irqfd is already setup, unmask it.
 625      * Otherwise, set it up now.
 626      */
 627     if (k->guest_notifier_mask) {
 628         k->guest_notifier_mask(proxy->vdev, queue_no, false);
 629         /* Test after unmasking to avoid losing events. */
 630         if (k->guest_notifier_pending &&
 631             k->guest_notifier_pending(proxy->vdev, queue_no)) {
 632             event_notifier_set(n);
 633         }
 634     } else {
 635         ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
 636     }
 637     return ret;
 638 }
 639
 640 static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
 641                                              unsigned int queue_no,
 642                                              unsigned int vector)
 643 {
 644     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(proxy->vdev);
 645
 646     /* If guest supports masking, keep irqfd but mask it.
 647      * Otherwise, clean it up now.
 648      */
 649     if (k->guest_notifier_mask) {
 650         k->guest_notifier_mask(proxy->vdev, queue_no, true);
 651     } else {
 652         kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 653     }
 654 }
 655
 656 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
 657                                     MSIMessage msg)
 658 {
 659     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 660     VirtIODevice *vdev = proxy->vdev;
 661     int ret, queue_no;
 662
 663     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 664         if (!virtio_queue_get_num(vdev, queue_no)) {
 665             break;
 666         }
 667         if (virtio_queue_vector(vdev, queue_no) != vector) {
 668             continue;
 669         }
 670         ret = virtio_pci_vq_vector_unmask(proxy, queue_no, vector, msg);
 671         if (ret < 0) {
 672             goto undo;
 673         }
 674     }
 675     return 0;
 676
 677 undo:
 678     while (--queue_no >= 0) {
 679         if (virtio_queue_vector(vdev, queue_no) != vector) {
 680             continue;
 681         }
 682         virtio_pci_vq_vector_mask(proxy, queue_no, vector);
 683     }
 684     return ret;
 685 }
 686
 687 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
 688 {
 689     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 690     VirtIODevice *vdev = proxy->vdev;
 691     int queue_no;
 692
 693     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 694         if (!virtio_queue_get_num(vdev, queue_no)) {
 695             break;
 696         }
 697         if (virtio_queue_vector(vdev, queue_no) != vector) {
 698             continue;
 699         }
 700         virtio_pci_vq_vector_mask(proxy, queue_no, vector);
 701     }
 702 }
 703
 704 static void virtio_pci_vector_poll(PCIDevice *dev,
 705                                    unsigned int vector_start,
 706                                    unsigned int vector_end)
 707 {
 708     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 709     VirtIODevice *vdev = proxy->vdev;
 710     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 711     int queue_no;
 712     unsigned int vector;
 713     EventNotifier *notifier;
 714     VirtQueue *vq;
 715
 716     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 717         if (!virtio_queue_get_num(vdev, queue_no)) {
 718             break;
 719         }
 720         vector = virtio_queue_vector(vdev, queue_no);
 721         if (vector < vector_start || vector >= vector_end ||
 722             !msix_is_masked(dev, vector)) {
 723             continue;
 724         }
 725         vq = virtio_get_queue(vdev, queue_no);
 726         notifier = virtio_queue_get_guest_notifier(vq);
 727         if (k->guest_notifier_pending) {
 728             if (k->guest_notifier_pending(vdev, queue_no)) {
 729                 msix_set_pending(dev, vector);
 730             }
 731         } else if (event_notifier_test_and_clear(notifier)) {
 732             msix_set_pending(dev, vector);
 733         }
 734     }
 735 }
 736
 737 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
 738                                          bool with_irqfd)
 739 {
 740     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 741     VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(proxy->vdev);
 742     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 743     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 744
 745     if (assign) {
 746         int r = event_notifier_init(notifier, 0);
 747         if (r < 0) {
 748             return r;
 749         }
 750         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
 751     } else {
 752         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
 753         event_notifier_cleanup(notifier);
 754     }
 755
 756     if (!msix_enabled(&proxy->pci_dev) && vdc->guest_notifier_mask) {
 757         vdc->guest_notifier_mask(proxy->vdev, n, !assign);
 758     }
 759
 760     return 0;
 761 }
 762
 763 static bool virtio_pci_query_guest_notifiers(DeviceState *d)
 764 {
 765     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 766     return msix_enabled(&proxy->pci_dev);
 767 }
 768
 769 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
 770 {
 771     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 772     VirtIODevice *vdev = proxy->vdev;
 773     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 774     int r, n;
 775     bool with_irqfd = msix_enabled(&proxy->pci_dev) &&
 776         kvm_msi_via_irqfd_enabled();
 777
 778     nvqs = MIN(nvqs, VIRTIO_PCI_QUEUE_MAX);
 779
 780     /* When deassigning, pass a consistent nvqs value
 781      * to avoid leaking notifiers.
 782      */
 783     assert(assign || nvqs == proxy->nvqs_with_notifiers);
 784
 785     proxy->nvqs_with_notifiers = nvqs;
 786
 787     /* Must unset vector notifier while guest notifier is still assigned */
 788     if ((proxy->vector_irqfd || k->guest_notifier_mask) && !assign) {
 789         msix_unset_vector_notifiers(&proxy->pci_dev);
 790         if (proxy->vector_irqfd) {
 791             kvm_virtio_pci_vector_release(proxy, nvqs);
 792             g_free(proxy->vector_irqfd);
 793             proxy->vector_irqfd = NULL;
 794         }
 795     }
 796
 797     for (n = 0; n < nvqs; n++) {
 798         if (!virtio_queue_get_num(vdev, n)) {
 799             break;
 800         }
 801
 802         r = virtio_pci_set_guest_notifier(d, n, assign,
 803                                           kvm_msi_via_irqfd_enabled());
 804         if (r < 0) {
 805             goto assign_error;
 806         }
 807     }
 808
 809     /* Must set vector notifier after guest notifier has been assigned */
 810     if ((with_irqfd || k->guest_notifier_mask) && assign) {
 811         if (with_irqfd) {
 812             proxy->vector_irqfd =
 813                 g_malloc0(sizeof(*proxy->vector_irqfd) *
 814                           msix_nr_vectors_allocated(&proxy->pci_dev));
 815             r = kvm_virtio_pci_vector_use(proxy, nvqs);
 816             if (r < 0) {
 817                 goto assign_error;
 818             }
 819         }
 820         r = msix_set_vector_notifiers(&proxy->pci_dev,
 821                                       virtio_pci_vector_unmask,
 822                                       virtio_pci_vector_mask,
 823                                       virtio_pci_vector_poll);
 824         if (r < 0) {
 825             goto notifiers_error;
 826         }
 827     }
 828
 829     return 0;
 830
 831 notifiers_error:
 832     if (with_irqfd) {
 833         assert(assign);
 834         kvm_virtio_pci_vector_release(proxy, nvqs);
 835     }
 836
 837 assign_error:
 838     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
 839     assert(assign);
 840     while (--n >= 0) {
 841         virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd);
 842     }
 843     return r;
 844 }
 845
 846 static int virtio_pci_set_host_notifier(DeviceState *d, int n, bool assign)
 847 {
 848     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 849
 850     /* Stop using ioeventfd for virtqueue kick if the device starts using host
 851      * notifiers.  This makes it easy to avoid stepping on each others' toes.
 852      */
 853     proxy->ioeventfd_disabled = assign;
 854     if (assign) {
 855         virtio_pci_stop_ioeventfd(proxy);
 856     }
 857     /* We don't need to start here: it's not needed because backend
 858      * currently only stops on status change away from ok,
 859      * reset, vmstop and such. If we do add code to start here,
 860      * need to check vmstate, device state etc. */
 861     return virtio_pci_set_host_notifier_internal(proxy, n, assign, false);
 862 }
 863
 864 static void virtio_pci_vmstate_change(DeviceState *d, bool running)
 865 {
 866     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 867
 868     if (running) {
 869         /* Try to find out if the guest has bus master disabled, but is
 870            in ready state. Then we have a buggy guest OS. */
 871         if ((proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
 872             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 873             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 874         }
 875         virtio_pci_start_ioeventfd(proxy);
 876     } else {
 877         virtio_pci_stop_ioeventfd(proxy);
 878     }
 879 }
 880
 881 #ifdef CONFIG_VIRTFS
 882 static int virtio_9p_init_pci(VirtIOPCIProxy *vpci_dev)
 883 {
 884     V9fsPCIState *dev = VIRTIO_9P_PCI(vpci_dev);
 885     DeviceState *vdev = DEVICE(&dev->vdev);
 886
 887     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
 888     if (qdev_init(vdev) < 0) {
 889         return -1;
 890     }
 891     return 0;
 892 }
 893
 894 static Property virtio_9p_pci_properties[] = {
 895     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
 896                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
 897     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
 898     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
 899     DEFINE_VIRTIO_9P_PROPERTIES(V9fsPCIState, vdev.fsconf),
 900     DEFINE_PROP_END_OF_LIST(),
 901 };
 902
 903 static void virtio_9p_pci_class_init(ObjectClass *klass, void *data)
 904 {
 905     DeviceClass *dc = DEVICE_CLASS(klass);
 906     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
 907     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
 908
 909     k->init = virtio_9p_init_pci;
 910     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 911     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_9P;
 912     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
 913     pcidev_k->class_id = 0x2;
 914     dc->props = virtio_9p_pci_properties;
 915 }
 916
 917 static void virtio_9p_pci_instance_init(Object *obj)
 918 {
 919     V9fsPCIState *dev = VIRTIO_9P_PCI(obj);
 920     object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_9P);
 921     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
 922 }
 923
 924 static const TypeInfo virtio_9p_pci_info = {
 925     .name          = TYPE_VIRTIO_9P_PCI,
 926     .parent        = TYPE_VIRTIO_PCI,
 927     .instance_size = sizeof(V9fsPCIState),
 928     .instance_init = virtio_9p_pci_instance_init,
 929     .class_init    = virtio_9p_pci_class_init,
 930 };
 931 #endif /* CONFIG_VIRTFS */
 932
 933 /*
 934  * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
 935  */
 936
 937 /* This is called by virtio-bus just after the device is plugged. */
 938 static void virtio_pci_device_plugged(DeviceState *d)
 939 {
 940     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
 941     VirtioBusState *bus = &proxy->bus;
 942     uint8_t *config;
 943     uint32_t size;
 944
 945     proxy->vdev = bus->vdev;
 946
 947     config = proxy->pci_dev.config;
 948     if (proxy->class_code) {
 949         pci_config_set_class(config, proxy->class_code);
 950     }
 951     pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
 952                  pci_get_word(config + PCI_VENDOR_ID));
 953     pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus));
 954     config[PCI_INTERRUPT_PIN] = 1;
 955
 956     if (proxy->nvectors &&
 957         msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1)) {
 958         proxy->nvectors = 0;
 959     }
 960
 961     proxy->pci_dev.config_write = virtio_write_config;
 962
 963     size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev)
 964          + virtio_bus_get_vdev_config_len(bus);
 965     if (size & (size - 1)) {
 966         size = 1 << qemu_fls(size);
 967     }
 968
 969     memory_region_init_io(&proxy->bar, &virtio_pci_config_ops, proxy,
 970                           "virtio-pci", size);
 971     pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
 972                      &proxy->bar);
 973
 974     if (!kvm_has_many_ioeventfds()) {
 975         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
 976     }
 977
 978     proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
 979     proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
 980     proxy->host_features = virtio_bus_get_vdev_features(bus,
 981                                                       proxy->host_features);
 982 }
 983
 984 static int virtio_pci_init(PCIDevice *pci_dev)
 985 {
 986     VirtIOPCIProxy *dev = VIRTIO_PCI(pci_dev);
 987     VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
 988     virtio_pci_bus_new(&dev->bus, dev);
 989     if (k->init != NULL) {
 990         return k->init(dev);
 991     }
 992     return 0;
 993 }
 994
 995 static void virtio_pci_exit(PCIDevice *pci_dev)
 996 {
 997     VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
 998     virtio_pci_stop_ioeventfd(proxy);
 999     memory_region_destroy(&proxy->bar);
1000     msix_uninit_exclusive_bar(pci_dev);
1001 }
1002
1003 static void virtio_pci_reset(DeviceState *qdev)
1004 {
1005     VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
1006     VirtioBusState *bus = VIRTIO_BUS(&proxy->bus);
1007     virtio_pci_stop_ioeventfd(proxy);
1008     virtio_bus_reset(bus);
1009     msix_unuse_all_vectors(&proxy->pci_dev);
1010     proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
1011 }
1012
1013 static void virtio_pci_class_init(ObjectClass *klass, void *data)
1014 {
1015     DeviceClass *dc = DEVICE_CLASS(klass);
1016     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1017
1018     k->init = virtio_pci_init;
1019     k->exit = virtio_pci_exit;
1020     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1021     k->revision = VIRTIO_PCI_ABI_VERSION;
1022     k->class_id = PCI_CLASS_OTHERS;
1023     dc->reset = virtio_pci_reset;
1024 }
1025
1026 static const TypeInfo virtio_pci_info = {
1027     .name          = TYPE_VIRTIO_PCI,
1028     .parent        = TYPE_PCI_DEVICE,
1029     .instance_size = sizeof(VirtIOPCIProxy),
1030     .class_init    = virtio_pci_class_init,
1031     .class_size    = sizeof(VirtioPCIClass),
1032     .abstract      = true,
1033 };
1034
1035 /* virtio-blk-pci */
1036
1037 static Property virtio_blk_pci_properties[] = {
1038     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1039     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1040                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1041     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1042 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
1043     DEFINE_PROP_BIT("x-data-plane", VirtIOBlkPCI, blk.data_plane, 0, false),
1044 #endif
1045     DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features),
1046     DEFINE_VIRTIO_BLK_PROPERTIES(VirtIOBlkPCI, blk),
1047     DEFINE_PROP_END_OF_LIST(),
1048 };
1049
1050 static int virtio_blk_pci_init(VirtIOPCIProxy *vpci_dev)
1051 {
1052     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(vpci_dev);
1053     DeviceState *vdev = DEVICE(&dev->vdev);
1054     virtio_blk_set_conf(vdev, &(dev->blk));
1055     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1056     if (qdev_init(vdev) < 0) {
1057         return -1;
1058     }
1059     return 0;
1060 }
1061
1062 static void virtio_blk_pci_class_init(ObjectClass *klass, void *data)
1063 {
1064     DeviceClass *dc = DEVICE_CLASS(klass);
1065     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1066     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1067
1068     dc->props = virtio_blk_pci_properties;
1069     k->init = virtio_blk_pci_init;
1070     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1071     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
1072     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1073     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1074 }
1075
1076 static void virtio_blk_pci_instance_init(Object *obj)
1077 {
1078     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(obj);
1079     object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_BLK);
1080     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1081 }
1082
1083 static const TypeInfo virtio_blk_pci_info = {
1084     .name          = TYPE_VIRTIO_BLK_PCI,
1085     .parent        = TYPE_VIRTIO_PCI,
1086     .instance_size = sizeof(VirtIOBlkPCI),
1087     .instance_init = virtio_blk_pci_instance_init,
1088     .class_init    = virtio_blk_pci_class_init,
1089 };
1090
1091 /* virtio-scsi-pci */
1092
1093 static Property virtio_scsi_pci_properties[] = {
1094     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1095                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1096     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
1097                        DEV_NVECTORS_UNSPECIFIED),
1098     DEFINE_VIRTIO_SCSI_FEATURES(VirtIOPCIProxy, host_features),
1099     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSIPCI, vdev.parent_obj.conf),
1100     DEFINE_PROP_END_OF_LIST(),
1101 };
1102
1103 static int virtio_scsi_pci_init_pci(VirtIOPCIProxy *vpci_dev)
1104 {
1105     VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(vpci_dev);
1106     DeviceState *vdev = DEVICE(&dev->vdev);
1107     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
1108     DeviceState *proxy = DEVICE(vpci_dev);
1109     char *bus_name;
1110
1111     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1112         vpci_dev->nvectors = vs->conf.num_queues + 3;
1113     }
1114
1115     /*
1116      * For command line compatibility, this sets the virtio-scsi-device bus
1117      * name as before.
1118      */
1119     if (proxy->id) {
1120         bus_name = g_strdup_printf("%s.0", proxy->id);
1121         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
1122         g_free(bus_name);
1123     }
1124
1125     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1126     if (qdev_init(vdev) < 0) {
1127         return -1;
1128     }
1129     return 0;
1130 }
1131
1132 static void virtio_scsi_pci_class_init(ObjectClass *klass, void *data)
1133 {
1134     DeviceClass *dc = DEVICE_CLASS(klass);
1135     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1136     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1137     k->init = virtio_scsi_pci_init_pci;
1138     dc->props = virtio_scsi_pci_properties;
1139     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1140     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1141     pcidev_k->revision = 0x00;
1142     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1143 }
1144
1145 static void virtio_scsi_pci_instance_init(Object *obj)
1146 {
1147     VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(obj);
1148     object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_SCSI);
1149     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1150 }
1151
1152 static const TypeInfo virtio_scsi_pci_info = {
1153     .name          = TYPE_VIRTIO_SCSI_PCI,
1154     .parent        = TYPE_VIRTIO_PCI,
1155     .instance_size = sizeof(VirtIOSCSIPCI),
1156     .instance_init = virtio_scsi_pci_instance_init,
1157     .class_init    = virtio_scsi_pci_class_init,
1158 };
1159
1160 /* vhost-scsi-pci */
1161
1162 #ifdef CONFIG_VHOST_SCSI
1163 static Property vhost_scsi_pci_properties[] = {
1164     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
1165                        DEV_NVECTORS_UNSPECIFIED),
1166     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1167     DEFINE_VHOST_SCSI_PROPERTIES(VHostSCSIPCI, vdev.parent_obj.conf),
1168     DEFINE_PROP_END_OF_LIST(),
1169 };
1170
1171 static int vhost_scsi_pci_init_pci(VirtIOPCIProxy *vpci_dev)
1172 {
1173     VHostSCSIPCI *dev = VHOST_SCSI_PCI(vpci_dev);
1174     DeviceState *vdev = DEVICE(&dev->vdev);
1175     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
1176
1177     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1178         vpci_dev->nvectors = vs->conf.num_queues + 3;
1179     }
1180
1181     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1182     if (qdev_init(vdev) < 0) {
1183         return -1;
1184     }
1185     return 0;
1186 }
1187
1188 static void vhost_scsi_pci_class_init(ObjectClass *klass, void *data)
1189 {
1190     DeviceClass *dc = DEVICE_CLASS(klass);
1191     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1192     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1193     k->init = vhost_scsi_pci_init_pci;
1194     dc->props = vhost_scsi_pci_properties;
1195     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1196     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1197     pcidev_k->revision = 0x00;
1198     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1199 }
1200
1201 static void vhost_scsi_pci_instance_init(Object *obj)
1202 {
1203     VHostSCSIPCI *dev = VHOST_SCSI_PCI(obj);
1204     object_initialize(OBJECT(&dev->vdev), TYPE_VHOST_SCSI);
1205     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1206 }
1207
1208 static const TypeInfo vhost_scsi_pci_info = {
1209     .name          = TYPE_VHOST_SCSI_PCI,
1210     .parent        = TYPE_VIRTIO_PCI,
1211     .instance_size = sizeof(VHostSCSIPCI),
1212     .instance_init = vhost_scsi_pci_instance_init,
1213     .class_init    = vhost_scsi_pci_class_init,
1214 };
1215 #endif
1216
1217 /* virtio-balloon-pci */
1218
1219 static void balloon_pci_stats_get_all(Object *obj, struct Visitor *v,
1220                                       void *opaque, const char *name,
1221                                       Error **errp)
1222 {
1223     VirtIOBalloonPCI *dev = opaque;
1224     object_property_get(OBJECT(&dev->vdev), v, "guest-stats", errp);
1225 }
1226
1227 static void balloon_pci_stats_get_poll_interval(Object *obj, struct Visitor *v,
1228                                                 void *opaque, const char *name,
1229                                                 Error **errp)
1230 {
1231     VirtIOBalloonPCI *dev = opaque;
1232     object_property_get(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
1233                         errp);
1234 }
1235
1236 static void balloon_pci_stats_set_poll_interval(Object *obj, struct Visitor *v,
1237                                                 void *opaque, const char *name,
1238                                                 Error **errp)
1239 {
1240     VirtIOBalloonPCI *dev = opaque;
1241     object_property_set(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
1242                         errp);
1243 }
1244
1245 static Property virtio_balloon_pci_properties[] = {
1246     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1247     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1248     DEFINE_PROP_END_OF_LIST(),
1249 };
1250
1251 static int virtio_balloon_pci_init(VirtIOPCIProxy *vpci_dev)
1252 {
1253     VirtIOBalloonPCI *dev = VIRTIO_BALLOON_PCI(vpci_dev);
1254     DeviceState *vdev = DEVICE(&dev->vdev);
1255
1256     if (vpci_dev->class_code != PCI_CLASS_OTHERS &&
1257         vpci_dev->class_code != PCI_CLASS_MEMORY_RAM) { /* qemu < 1.1 */
1258         vpci_dev->class_code = PCI_CLASS_OTHERS;
1259     }
1260
1261     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1262     if (qdev_init(vdev) < 0) {
1263         return -1;
1264     }
1265     return 0;
1266 }
1267
1268 static void virtio_balloon_pci_class_init(ObjectClass *klass, void *data)
1269 {
1270     DeviceClass *dc = DEVICE_CLASS(klass);
1271     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1272     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1273     k->init = virtio_balloon_pci_init;
1274     dc->props = virtio_balloon_pci_properties;
1275     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1276     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BALLOON;
1277     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1278     pcidev_k->class_id = PCI_CLASS_OTHERS;
1279 }
1280
1281 static void virtio_balloon_pci_instance_init(Object *obj)
1282 {
1283     VirtIOBalloonPCI *dev = VIRTIO_BALLOON_PCI(obj);
1284     object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_BALLOON);
1285     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1286
1287     object_property_add(obj, "guest-stats", "guest statistics",
1288                         balloon_pci_stats_get_all, NULL, NULL, dev,
1289                         NULL);
1290
1291     object_property_add(obj, "guest-stats-polling-interval", "int",
1292                         balloon_pci_stats_get_poll_interval,
1293                         balloon_pci_stats_set_poll_interval,
1294                         NULL, dev, NULL);
1295 }
1296
1297 static const TypeInfo virtio_balloon_pci_info = {
1298     .name          = TYPE_VIRTIO_BALLOON_PCI,
1299     .parent        = TYPE_VIRTIO_PCI,
1300     .instance_size = sizeof(VirtIOBalloonPCI),
1301     .instance_init = virtio_balloon_pci_instance_init,
1302     .class_init    = virtio_balloon_pci_class_init,
1303 };
1304
1305 /* virtio-serial-pci */
1306
1307 static int virtio_serial_pci_init(VirtIOPCIProxy *vpci_dev)
1308 {
1309     VirtIOSerialPCI *dev = VIRTIO_SERIAL_PCI(vpci_dev);
1310     DeviceState *vdev = DEVICE(&dev->vdev);
1311     DeviceState *proxy = DEVICE(vpci_dev);
1312     char *bus_name;
1313
1314     if (vpci_dev->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
1315         vpci_dev->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
1316         vpci_dev->class_code != PCI_CLASS_OTHERS) {        /* qemu-kvm  */
1317             vpci_dev->class_code = PCI_CLASS_COMMUNICATION_OTHER;
1318     }
1319
1320     /* backwards-compatibility with machines that were created with
1321        DEV_NVECTORS_UNSPECIFIED */
1322     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1323         vpci_dev->nvectors = dev->vdev.serial.max_virtserial_ports + 1;
1324     }
1325
1326     /*
1327      * For command line compatibility, this sets the virtio-serial-device bus
1328      * name as before.
1329      */
1330     if (proxy->id) {
1331         bus_name = g_strdup_printf("%s.0", proxy->id);
1332         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
1333         g_free(bus_name);
1334     }
1335
1336     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1337     if (qdev_init(vdev) < 0) {
1338         return -1;
1339     }
1340     return 0;
1341 }
1342
1343 static Property virtio_serial_pci_properties[] = {
1344     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1345                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1346     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1347     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1348     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1349     DEFINE_VIRTIO_SERIAL_PROPERTIES(VirtIOSerialPCI, vdev.serial),
1350     DEFINE_PROP_END_OF_LIST(),
1351 };
1352
1353 static void virtio_serial_pci_class_init(ObjectClass *klass, void *data)
1354 {
1355     DeviceClass *dc = DEVICE_CLASS(klass);
1356     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1357     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1358     k->init = virtio_serial_pci_init;
1359     dc->props = virtio_serial_pci_properties;
1360     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1361     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_CONSOLE;
1362     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1363     pcidev_k->class_id = PCI_CLASS_COMMUNICATION_OTHER;
1364 }
1365
1366 static void virtio_serial_pci_instance_init(Object *obj)
1367 {
1368     VirtIOSerialPCI *dev = VIRTIO_SERIAL_PCI(obj);
1369     object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_SERIAL);
1370     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1371 }
1372
1373 static const TypeInfo virtio_serial_pci_info = {
1374     .name          = TYPE_VIRTIO_SERIAL_PCI,
1375     .parent        = TYPE_VIRTIO_PCI,
1376     .instance_size = sizeof(VirtIOSerialPCI),
1377     .instance_init = virtio_serial_pci_instance_init,
1378     .class_init    = virtio_serial_pci_class_init,
1379 };
1380
1381 /* virtio-net-pci */
1382
1383 static Property virtio_net_properties[] = {
1384     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1385                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
1386     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
1387     DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features),
1388     DEFINE_NIC_PROPERTIES(VirtIONetPCI, vdev.nic_conf),
1389     DEFINE_VIRTIO_NET_PROPERTIES(VirtIONetPCI, vdev.net_conf),
1390     DEFINE_PROP_END_OF_LIST(),
1391 };
1392
1393 static int virtio_net_pci_init(VirtIOPCIProxy *vpci_dev)
1394 {
1395     DeviceState *qdev = DEVICE(vpci_dev);
1396     VirtIONetPCI *dev = VIRTIO_NET_PCI(vpci_dev);
1397     DeviceState *vdev = DEVICE(&dev->vdev);
1398
1399     virtio_net_set_config_size(&dev->vdev, vpci_dev->host_features);
1400     virtio_net_set_netclient_name(&dev->vdev, qdev->id,
1401                                   object_get_typename(OBJECT(qdev)));
1402     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1403     if (qdev_init(vdev) < 0) {
1404         return -1;
1405     }
1406     return 0;
1407 }
1408
1409 static void virtio_net_pci_class_init(ObjectClass *klass, void *data)
1410 {
1411     DeviceClass *dc = DEVICE_CLASS(klass);
1412     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1413     VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass);
1414
1415     k->romfile = "efi-virtio.rom";
1416     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1417     k->device_id = PCI_DEVICE_ID_VIRTIO_NET;
1418     k->revision = VIRTIO_PCI_ABI_VERSION;
1419     k->class_id = PCI_CLASS_NETWORK_ETHERNET;
1420     dc->props = virtio_net_properties;
1421     vpciklass->init = virtio_net_pci_init;
1422 }
1423
1424 static void virtio_net_pci_instance_init(Object *obj)
1425 {
1426     VirtIONetPCI *dev = VIRTIO_NET_PCI(obj);
1427     object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_NET);
1428     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1429 }
1430
1431 static const TypeInfo virtio_net_pci_info = {
1432     .name          = TYPE_VIRTIO_NET_PCI,
1433     .parent        = TYPE_VIRTIO_PCI,
1434     .instance_size = sizeof(VirtIONetPCI),
1435     .instance_init = virtio_net_pci_instance_init,
1436     .class_init    = virtio_net_pci_class_init,
1437 };
1438
1439 /* virtio-rng-pci */
1440
1441 static Property virtio_rng_pci_properties[] = {
1442     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1443     DEFINE_VIRTIO_RNG_PROPERTIES(VirtIORngPCI, vdev.conf),
1444     DEFINE_PROP_END_OF_LIST(),
1445 };
1446
1447 static int virtio_rng_pci_init(VirtIOPCIProxy *vpci_dev)
1448 {
1449     VirtIORngPCI *vrng = VIRTIO_RNG_PCI(vpci_dev);
1450     DeviceState *vdev = DEVICE(&vrng->vdev);
1451
1452     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1453     if (qdev_init(vdev) < 0) {
1454         return -1;
1455     }
1456
1457     object_property_set_link(OBJECT(vrng),
1458                              OBJECT(vrng->vdev.conf.rng), "rng",
1459                              NULL);
1460
1461     return 0;
1462 }
1463
1464 static void virtio_rng_pci_class_init(ObjectClass *klass, void *data)
1465 {
1466     DeviceClass *dc = DEVICE_CLASS(klass);
1467     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1468     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1469
1470     k->init = virtio_rng_pci_init;
1471     dc->props = virtio_rng_pci_properties;
1472
1473     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1474     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_RNG;
1475     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1476     pcidev_k->class_id = PCI_CLASS_OTHERS;
1477 }
1478
1479 static void virtio_rng_initfn(Object *obj)
1480 {
1481     VirtIORngPCI *dev = VIRTIO_RNG_PCI(obj);
1482     object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_RNG);
1483     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1484     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
1485                              (Object **)&dev->vdev.conf.rng, NULL);
1486
1487 }
1488
1489 static const TypeInfo virtio_rng_pci_info = {
1490     .name          = TYPE_VIRTIO_RNG_PCI,
1491     .parent        = TYPE_VIRTIO_PCI,
1492     .instance_size = sizeof(VirtIORngPCI),
1493     .instance_init = virtio_rng_initfn,
1494     .class_init    = virtio_rng_pci_class_init,
1495 };
1496
1497 /* virtio-pci-bus */
1498
1499 static void virtio_pci_bus_new(VirtioBusState *bus, VirtIOPCIProxy *dev)
1500 {
1501     DeviceState *qdev = DEVICE(dev);
1502     BusState *qbus;
1503     char virtio_bus_name[] = "virtio-bus";
1504
1505     qbus_create_inplace((BusState *)bus, TYPE_VIRTIO_PCI_BUS, qdev,
1506                         virtio_bus_name);
1507     qbus = BUS(bus);
1508     qbus->allow_hotplug = 1;
1509 }
1510
1511 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
1512 {
1513     BusClass *bus_class = BUS_CLASS(klass);
1514     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
1515     bus_class->max_dev = 1;
1516     k->notify = virtio_pci_notify;
1517     k->save_config = virtio_pci_save_config;
1518     k->load_config = virtio_pci_load_config;
1519     k->save_queue = virtio_pci_save_queue;
1520     k->load_queue = virtio_pci_load_queue;
1521     k->get_features = virtio_pci_get_features;
1522     k->query_guest_notifiers = virtio_pci_query_guest_notifiers;
1523     k->set_host_notifier = virtio_pci_set_host_notifier;
1524     k->set_guest_notifiers = virtio_pci_set_guest_notifiers;
1525     k->vmstate_change = virtio_pci_vmstate_change;
1526     k->device_plugged = virtio_pci_device_plugged;
1527 }
1528
1529 static const TypeInfo virtio_pci_bus_info = {
1530     .name          = TYPE_VIRTIO_PCI_BUS,
1531     .parent        = TYPE_VIRTIO_BUS,
1532     .instance_size = sizeof(VirtioPCIBusState),
1533     .class_init    = virtio_pci_bus_class_init,
1534 };
1535
1536 static void virtio_pci_register_types(void)
1537 {
1538     type_register_static(&virtio_rng_pci_info);
1539     type_register_static(&virtio_pci_bus_info);
1540     type_register_static(&virtio_pci_info);
1541 #ifdef CONFIG_VIRTFS
1542     type_register_static(&virtio_9p_pci_info);
1543 #endif
1544     type_register_static(&virtio_blk_pci_info);
1545     type_register_static(&virtio_scsi_pci_info);
1546     type_register_static(&virtio_balloon_pci_info);
1547     type_register_static(&virtio_serial_pci_info);
1548     type_register_static(&virtio_net_pci_info);
1549 #ifdef CONFIG_VHOST_SCSI
1550     type_register_static(&vhost_scsi_pci_info);
1551 #endif
1552 }
1553
1554 type_init(virtio_pci_register_types)