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, size_t bus_size,
  96                                VirtIOPCIProxy *dev);
  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         pci_set_irq(&proxy->pci_dev, 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 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 258 {
 259     VirtIOPCIProxy *proxy = opaque;
 260     VirtIODevice *vdev = proxy->vdev;
 261     hwaddr pa;
 262
 263     switch (addr) {
 264     case VIRTIO_PCI_GUEST_FEATURES:
 265         /* Guest does not negotiate properly?  We have to assume nothing. */
 266         if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
 267             val = virtio_bus_get_vdev_bad_features(&proxy->bus);
 268         }
 269         virtio_set_features(vdev, val);
 270         break;
 271     case VIRTIO_PCI_QUEUE_PFN:
 272         pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 273         if (pa == 0) {
 274             virtio_pci_stop_ioeventfd(proxy);
 275             virtio_reset(proxy->vdev);
 276             msix_unuse_all_vectors(&proxy->pci_dev);
 277         }
 278         else
 279             virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
 280         break;
 281     case VIRTIO_PCI_QUEUE_SEL:
 282         if (val < VIRTIO_PCI_QUEUE_MAX)
 283             vdev->queue_sel = val;
 284         break;
 285     case VIRTIO_PCI_QUEUE_NOTIFY:
 286         if (val < VIRTIO_PCI_QUEUE_MAX) {
 287             virtio_queue_notify(vdev, val);
 288         }
 289         break;
 290     case VIRTIO_PCI_STATUS:
 291         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
 292             virtio_pci_stop_ioeventfd(proxy);
 293         }
 294
 295         virtio_set_status(vdev, val & 0xFF);
 296
 297         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
 298             virtio_pci_start_ioeventfd(proxy);
 299         }
 300
 301         if (vdev->status == 0) {
 302             virtio_reset(proxy->vdev);
 303             msix_unuse_all_vectors(&proxy->pci_dev);
 304         }
 305
 306         /* Linux before 2.6.34 sets the device as OK without enabling
 307            the PCI device bus master bit. In this case we need to disable
 308            some safety checks. */
 309         if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
 310             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 311             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 312         }
 313         break;
 314     case VIRTIO_MSI_CONFIG_VECTOR:
 315         msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
 316         /* Make it possible for guest to discover an error took place. */
 317         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 318             val = VIRTIO_NO_VECTOR;
 319         vdev->config_vector = val;
 320         break;
 321     case VIRTIO_MSI_QUEUE_VECTOR:
 322         msix_vector_unuse(&proxy->pci_dev,
 323                           virtio_queue_vector(vdev, vdev->queue_sel));
 324         /* Make it possible for guest to discover an error took place. */
 325         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 326             val = VIRTIO_NO_VECTOR;
 327         virtio_queue_set_vector(vdev, vdev->queue_sel, val);
 328         break;
 329     default:
 330         error_report("%s: unexpected address 0x%x value 0x%x",
 331                      __func__, addr, val);
 332         break;
 333     }
 334 }
 335
 336 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
 337 {
 338     VirtIODevice *vdev = proxy->vdev;
 339     uint32_t ret = 0xFFFFFFFF;
 340
 341     switch (addr) {
 342     case VIRTIO_PCI_HOST_FEATURES:
 343         ret = proxy->host_features;
 344         break;
 345     case VIRTIO_PCI_GUEST_FEATURES:
 346         ret = vdev->guest_features;
 347         break;
 348     case VIRTIO_PCI_QUEUE_PFN:
 349         ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
 350               >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 351         break;
 352     case VIRTIO_PCI_QUEUE_NUM:
 353         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
 354         break;
 355     case VIRTIO_PCI_QUEUE_SEL:
 356         ret = vdev->queue_sel;
 357         break;
 358     case VIRTIO_PCI_STATUS:
 359         ret = vdev->status;
 360         break;
 361     case VIRTIO_PCI_ISR:
 362         /* reading from the ISR also clears it. */
 363         ret = vdev->isr;
 364         vdev->isr = 0;
 365         pci_irq_deassert(&proxy->pci_dev);
 366         break;
 367     case VIRTIO_MSI_CONFIG_VECTOR:
 368         ret = vdev->config_vector;
 369         break;
 370     case VIRTIO_MSI_QUEUE_VECTOR:
 371         ret = virtio_queue_vector(vdev, vdev->queue_sel);
 372         break;
 373     default:
 374         break;
 375     }
 376
 377     return ret;
 378 }
 379
 380 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
 381                                        unsigned size)
 382 {
 383     VirtIOPCIProxy *proxy = opaque;
 384     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 385     uint64_t val = 0;
 386     if (addr < config) {
 387         return virtio_ioport_read(proxy, addr);
 388     }
 389     addr -= config;
 390
 391     switch (size) {
 392     case 1:
 393         val = virtio_config_readb(proxy->vdev, addr);
 394         break;
 395     case 2:
 396         val = virtio_config_readw(proxy->vdev, addr);
 397         if (virtio_is_big_endian()) {
 398             val = bswap16(val);
 399         }
 400         break;
 401     case 4:
 402         val = virtio_config_readl(proxy->vdev, addr);
 403         if (virtio_is_big_endian()) {
 404             val = bswap32(val);
 405         }
 406         break;
 407     }
 408     return val;
 409 }
 410
 411 static void virtio_pci_config_write(void *opaque, hwaddr addr,
 412                                     uint64_t val, unsigned size)
 413 {
 414     VirtIOPCIProxy *proxy = opaque;
 415     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 416     if (addr < config) {
 417         virtio_ioport_write(proxy, addr, val);
 418         return;
 419     }
 420     addr -= config;
 421     /*
 422      * Virtio-PCI is odd. Ioports are LE but config space is target native
 423      * endian.
 424      */
 425     switch (size) {
 426     case 1:
 427         virtio_config_writeb(proxy->vdev, addr, val);
 428         break;
 429     case 2:
 430         if (virtio_is_big_endian()) {
 431             val = bswap16(val);
 432         }
 433         virtio_config_writew(proxy->vdev, addr, val);
 434         break;
 435     case 4:
 436         if (virtio_is_big_endian()) {
 437             val = bswap32(val);
 438         }
 439         virtio_config_writel(proxy->vdev, addr, val);
 440         break;
 441     }
 442 }
 443
 444 static const MemoryRegionOps virtio_pci_config_ops = {
 445     .read = virtio_pci_config_read,
 446     .write = virtio_pci_config_write,
 447     .impl = {
 448         .min_access_size = 1,
 449         .max_access_size = 4,
 450     },
 451     .endianness = DEVICE_LITTLE_ENDIAN,
 452 };
 453
 454 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 455                                 uint32_t val, int len)
 456 {
 457     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 458
 459     pci_default_write_config(pci_dev, address, val, len);
 460
 461     if (range_covers_byte(address, len, PCI_COMMAND) &&
 462         !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER) &&
 463         !(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
 464         virtio_pci_stop_ioeventfd(proxy);
 465         virtio_set_status(proxy->vdev,
 466                           proxy->vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
 467     }
 468 }
 469
 470 static unsigned virtio_pci_get_features(DeviceState *d)
 471 {
 472     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 473     return proxy->host_features;
 474 }
 475
 476 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
 477                                         unsigned int queue_no,
 478                                         unsigned int vector,
 479                                         MSIMessage msg)
 480 {
 481     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 482     int ret;
 483
 484     if (irqfd->users == 0) {
 485         ret = kvm_irqchip_add_msi_route(kvm_state, msg);
 486         if (ret < 0) {
 487             return ret;
 488         }
 489         irqfd->virq = ret;
 490     }
 491     irqfd->users++;
 492     return 0;
 493 }
 494
 495 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
 496                                              unsigned int vector)
 497 {
 498     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 499     if (--irqfd->users == 0) {
 500         kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 501     }
 502 }
 503
 504 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
 505                                  unsigned int queue_no,
 506                                  unsigned int vector)
 507 {
 508     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 509     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 510     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 511     int ret;
 512     ret = kvm_irqchip_add_irqfd_notifier(kvm_state, n, NULL, irqfd->virq);
 513     return ret;
 514 }
 515
 516 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
 517                                       unsigned int queue_no,
 518                                       unsigned int vector)
 519 {
 520     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 521     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 522     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 523     int ret;
 524
 525     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, n, irqfd->virq);
 526     assert(ret == 0);
 527 }
 528
 529 static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
 530 {
 531     PCIDevice *dev = &proxy->pci_dev;
 532     VirtIODevice *vdev = proxy->vdev;
 533     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 534     unsigned int vector;
 535     int ret, queue_no;
 536     MSIMessage msg;
 537
 538     for (queue_no = 0; queue_no < nvqs; queue_no++) {
 539         if (!virtio_queue_get_num(vdev, queue_no)) {
 540             break;
 541         }
 542         vector = virtio_queue_vector(vdev, queue_no);
 543         if (vector >= msix_nr_vectors_allocated(dev)) {
 544             continue;
 545         }
 546         msg = msix_get_message(dev, vector);
 547         ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector, msg);
 548         if (ret < 0) {
 549             goto undo;
 550         }
 551         /* If guest supports masking, set up irqfd now.
 552          * Otherwise, delay until unmasked in the frontend.
 553          */
 554         if (k->guest_notifier_mask) {
 555             ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
 556             if (ret < 0) {
 557                 kvm_virtio_pci_vq_vector_release(proxy, vector);
 558                 goto undo;
 559             }
 560         }
 561     }
 562     return 0;
 563
 564 undo:
 565     while (--queue_no >= 0) {
 566         vector = virtio_queue_vector(vdev, queue_no);
 567         if (vector >= msix_nr_vectors_allocated(dev)) {
 568             continue;
 569         }
 570         if (k->guest_notifier_mask) {
 571             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 572         }
 573         kvm_virtio_pci_vq_vector_release(proxy, vector);
 574     }
 575     return ret;
 576 }
 577
 578 static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
 579 {
 580     PCIDevice *dev = &proxy->pci_dev;
 581     VirtIODevice *vdev = proxy->vdev;
 582     unsigned int vector;
 583     int queue_no;
 584     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 585
 586     for (queue_no = 0; queue_no < nvqs; queue_no++) {
 587         if (!virtio_queue_get_num(vdev, queue_no)) {
 588             break;
 589         }
 590         vector = virtio_queue_vector(vdev, queue_no);
 591         if (vector >= msix_nr_vectors_allocated(dev)) {
 592             continue;
 593         }
 594         /* If guest supports masking, clean up irqfd now.
 595          * Otherwise, it was cleaned when masked in the frontend.
 596          */
 597         if (k->guest_notifier_mask) {
 598             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 599         }
 600         kvm_virtio_pci_vq_vector_release(proxy, vector);
 601     }
 602 }
 603
 604 static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
 605                                        unsigned int queue_no,
 606                                        unsigned int vector,
 607                                        MSIMessage msg)
 608 {
 609     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(proxy->vdev);
 610     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 611     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 612     VirtIOIRQFD *irqfd;
 613     int ret = 0;
 614
 615     if (proxy->vector_irqfd) {
 616         irqfd = &proxy->vector_irqfd[vector];
 617         if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) {
 618             ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg);
 619             if (ret < 0) {
 620                 return ret;
 621             }
 622         }
 623     }
 624
 625     /* If guest supports masking, irqfd is already setup, unmask it.
 626      * Otherwise, set it up now.
 627      */
 628     if (k->guest_notifier_mask) {
 629         k->guest_notifier_mask(proxy->vdev, queue_no, false);
 630         /* Test after unmasking to avoid losing events. */
 631         if (k->guest_notifier_pending &&
 632             k->guest_notifier_pending(proxy->vdev, queue_no)) {
 633             event_notifier_set(n);
 634         }
 635     } else {
 636         ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
 637     }
 638     return ret;
 639 }
 640
 641 static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
 642                                              unsigned int queue_no,
 643                                              unsigned int vector)
 644 {
 645     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(proxy->vdev);
 646
 647     /* If guest supports masking, keep irqfd but mask it.
 648      * Otherwise, clean it up now.
 649      */
 650     if (k->guest_notifier_mask) {
 651         k->guest_notifier_mask(proxy->vdev, queue_no, true);
 652     } else {
 653         kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 654     }
 655 }
 656
 657 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
 658                                     MSIMessage msg)
 659 {
 660     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 661     VirtIODevice *vdev = proxy->vdev;
 662     int ret, queue_no;
 663
 664     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 665         if (!virtio_queue_get_num(vdev, queue_no)) {
 666             break;
 667         }
 668         if (virtio_queue_vector(vdev, queue_no) != vector) {
 669             continue;
 670         }
 671         ret = virtio_pci_vq_vector_unmask(proxy, queue_no, vector, msg);
 672         if (ret < 0) {
 673             goto undo;
 674         }
 675     }
 676     return 0;
 677
 678 undo:
 679     while (--queue_no >= 0) {
 680         if (virtio_queue_vector(vdev, queue_no) != vector) {
 681             continue;
 682         }
 683         virtio_pci_vq_vector_mask(proxy, queue_no, vector);
 684     }
 685     return ret;
 686 }
 687
 688 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
 689 {
 690     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 691     VirtIODevice *vdev = proxy->vdev;
 692     int queue_no;
 693
 694     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 695         if (!virtio_queue_get_num(vdev, queue_no)) {
 696             break;
 697         }
 698         if (virtio_queue_vector(vdev, queue_no) != vector) {
 699             continue;
 700         }
 701         virtio_pci_vq_vector_mask(proxy, queue_no, vector);
 702     }
 703 }
 704
 705 static void virtio_pci_vector_poll(PCIDevice *dev,
 706                                    unsigned int vector_start,
 707                                    unsigned int vector_end)
 708 {
 709     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 710     VirtIODevice *vdev = proxy->vdev;
 711     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 712     int queue_no;
 713     unsigned int vector;
 714     EventNotifier *notifier;
 715     VirtQueue *vq;
 716
 717     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 718         if (!virtio_queue_get_num(vdev, queue_no)) {
 719             break;
 720         }
 721         vector = virtio_queue_vector(vdev, queue_no);
 722         if (vector < vector_start || vector >= vector_end ||
 723             !msix_is_masked(dev, vector)) {
 724             continue;
 725         }
 726         vq = virtio_get_queue(vdev, queue_no);
 727         notifier = virtio_queue_get_guest_notifier(vq);
 728         if (k->guest_notifier_pending) {
 729             if (k->guest_notifier_pending(vdev, queue_no)) {
 730                 msix_set_pending(dev, vector);
 731             }
 732         } else if (event_notifier_test_and_clear(notifier)) {
 733             msix_set_pending(dev, vector);
 734         }
 735     }
 736 }
 737
 738 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
 739                                          bool with_irqfd)
 740 {
 741     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 742     VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(proxy->vdev);
 743     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 744     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 745
 746     if (assign) {
 747         int r = event_notifier_init(notifier, 0);
 748         if (r < 0) {
 749             return r;
 750         }
 751         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
 752     } else {
 753         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
 754         event_notifier_cleanup(notifier);
 755     }
 756
 757     if (!msix_enabled(&proxy->pci_dev) && vdc->guest_notifier_mask) {
 758         vdc->guest_notifier_mask(proxy->vdev, n, !assign);
 759     }
 760
 761     return 0;
 762 }
 763
 764 static bool virtio_pci_query_guest_notifiers(DeviceState *d)
 765 {
 766     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 767     return msix_enabled(&proxy->pci_dev);
 768 }
 769
 770 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
 771 {
 772     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 773     VirtIODevice *vdev = proxy->vdev;
 774     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 775     int r, n;
 776     bool with_irqfd = msix_enabled(&proxy->pci_dev) &&
 777         kvm_msi_via_irqfd_enabled();
 778
 779     nvqs = MIN(nvqs, VIRTIO_PCI_QUEUE_MAX);
 780
 781     /* When deassigning, pass a consistent nvqs value
 782      * to avoid leaking notifiers.
 783      */
 784     assert(assign || nvqs == proxy->nvqs_with_notifiers);
 785
 786     proxy->nvqs_with_notifiers = nvqs;
 787
 788     /* Must unset vector notifier while guest notifier is still assigned */
 789     if ((proxy->vector_irqfd || k->guest_notifier_mask) && !assign) {
 790         msix_unset_vector_notifiers(&proxy->pci_dev);
 791         if (proxy->vector_irqfd) {
 792             kvm_virtio_pci_vector_release(proxy, nvqs);
 793             g_free(proxy->vector_irqfd);
 794             proxy->vector_irqfd = NULL;
 795         }
 796     }
 797
 798     for (n = 0; n < nvqs; n++) {
 799         if (!virtio_queue_get_num(vdev, n)) {
 800             break;
 801         }
 802
 803         r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd);
 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     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 915     dc->props = virtio_9p_pci_properties;
 916 }
 917
 918 static void virtio_9p_pci_instance_init(Object *obj)
 919 {
 920     V9fsPCIState *dev = VIRTIO_9P_PCI(obj);
 921     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_9P);
 922     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
 923 }
 924
 925 static const TypeInfo virtio_9p_pci_info = {
 926     .name          = TYPE_VIRTIO_9P_PCI,
 927     .parent        = TYPE_VIRTIO_PCI,
 928     .instance_size = sizeof(V9fsPCIState),
 929     .instance_init = virtio_9p_pci_instance_init,
 930     .class_init    = virtio_9p_pci_class_init,
 931 };
 932 #endif /* CONFIG_VIRTFS */
 933
 934 /*
 935  * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
 936  */
 937
 938 /* This is called by virtio-bus just after the device is plugged. */
 939 static void virtio_pci_device_plugged(DeviceState *d)
 940 {
 941     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
 942     VirtioBusState *bus = &proxy->bus;
 943     uint8_t *config;
 944     uint32_t size;
 945
 946     proxy->vdev = bus->vdev;
 947
 948     config = proxy->pci_dev.config;
 949     if (proxy->class_code) {
 950         pci_config_set_class(config, proxy->class_code);
 951     }
 952     pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
 953                  pci_get_word(config + PCI_VENDOR_ID));
 954     pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus));
 955     config[PCI_INTERRUPT_PIN] = 1;
 956
 957     if (proxy->nvectors &&
 958         msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1)) {
 959         proxy->nvectors = 0;
 960     }
 961
 962     proxy->pci_dev.config_write = virtio_write_config;
 963
 964     size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev)
 965          + virtio_bus_get_vdev_config_len(bus);
 966     if (size & (size - 1)) {
 967         size = 1 << qemu_fls(size);
 968     }
 969
 970     memory_region_init_io(&proxy->bar, OBJECT(proxy), &virtio_pci_config_ops,
 971                           proxy, "virtio-pci", size);
 972     pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
 973                      &proxy->bar);
 974
 975     if (!kvm_has_many_ioeventfds()) {
 976         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
 977     }
 978
 979     proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
 980     proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
 981     proxy->host_features = virtio_bus_get_vdev_features(bus,
 982                                                       proxy->host_features);
 983 }
 984
 985 static int virtio_pci_init(PCIDevice *pci_dev)
 986 {
 987     VirtIOPCIProxy *dev = VIRTIO_PCI(pci_dev);
 988     VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
 989     virtio_pci_bus_new(&dev->bus, sizeof(dev->bus), dev);
 990     if (k->init != NULL) {
 991         return k->init(dev);
 992     }
 993     return 0;
 994 }
 995
 996 static void virtio_pci_exit(PCIDevice *pci_dev)
 997 {
 998     VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
 999     virtio_pci_stop_ioeventfd(proxy);
1000     memory_region_destroy(&proxy->bar);
1001     msix_uninit_exclusive_bar(pci_dev);
1002 }
1003
1004 static void virtio_pci_reset(DeviceState *qdev)
1005 {
1006     VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
1007     VirtioBusState *bus = VIRTIO_BUS(&proxy->bus);
1008     virtio_pci_stop_ioeventfd(proxy);
1009     virtio_bus_reset(bus);
1010     msix_unuse_all_vectors(&proxy->pci_dev);
1011     proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
1012 }
1013
1014 static void virtio_pci_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_pci_init;
1020     k->exit = virtio_pci_exit;
1021     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1022     k->revision = VIRTIO_PCI_ABI_VERSION;
1023     k->class_id = PCI_CLASS_OTHERS;
1024     dc->reset = virtio_pci_reset;
1025 }
1026
1027 static const TypeInfo virtio_pci_info = {
1028     .name          = TYPE_VIRTIO_PCI,
1029     .parent        = TYPE_PCI_DEVICE,
1030     .instance_size = sizeof(VirtIOPCIProxy),
1031     .class_init    = virtio_pci_class_init,
1032     .class_size    = sizeof(VirtioPCIClass),
1033     .abstract      = true,
1034 };
1035
1036 /* virtio-blk-pci */
1037
1038 static Property virtio_blk_pci_properties[] = {
1039     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1040     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1041                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1042     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1043 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
1044     DEFINE_PROP_BIT("x-data-plane", VirtIOBlkPCI, blk.data_plane, 0, false),
1045 #endif
1046     DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features),
1047     DEFINE_VIRTIO_BLK_PROPERTIES(VirtIOBlkPCI, blk),
1048     DEFINE_PROP_END_OF_LIST(),
1049 };
1050
1051 static int virtio_blk_pci_init(VirtIOPCIProxy *vpci_dev)
1052 {
1053     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(vpci_dev);
1054     DeviceState *vdev = DEVICE(&dev->vdev);
1055     virtio_blk_set_conf(vdev, &(dev->blk));
1056     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1057     if (qdev_init(vdev) < 0) {
1058         return -1;
1059     }
1060     return 0;
1061 }
1062
1063 static void virtio_blk_pci_class_init(ObjectClass *klass, void *data)
1064 {
1065     DeviceClass *dc = DEVICE_CLASS(klass);
1066     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1067     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1068
1069     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1070     dc->props = virtio_blk_pci_properties;
1071     k->init = virtio_blk_pci_init;
1072     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1073     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
1074     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1075     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1076 }
1077
1078 static void virtio_blk_pci_instance_init(Object *obj)
1079 {
1080     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(obj);
1081     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_BLK);
1082     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1083 }
1084
1085 static const TypeInfo virtio_blk_pci_info = {
1086     .name          = TYPE_VIRTIO_BLK_PCI,
1087     .parent        = TYPE_VIRTIO_PCI,
1088     .instance_size = sizeof(VirtIOBlkPCI),
1089     .instance_init = virtio_blk_pci_instance_init,
1090     .class_init    = virtio_blk_pci_class_init,
1091 };
1092
1093 /* virtio-scsi-pci */
1094
1095 static Property virtio_scsi_pci_properties[] = {
1096     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1097                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1098     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
1099                        DEV_NVECTORS_UNSPECIFIED),
1100     DEFINE_VIRTIO_SCSI_FEATURES(VirtIOPCIProxy, host_features),
1101     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSIPCI, vdev.parent_obj.conf),
1102     DEFINE_PROP_END_OF_LIST(),
1103 };
1104
1105 static int virtio_scsi_pci_init_pci(VirtIOPCIProxy *vpci_dev)
1106 {
1107     VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(vpci_dev);
1108     DeviceState *vdev = DEVICE(&dev->vdev);
1109     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
1110     DeviceState *proxy = DEVICE(vpci_dev);
1111     char *bus_name;
1112
1113     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1114         vpci_dev->nvectors = vs->conf.num_queues + 3;
1115     }
1116
1117     /*
1118      * For command line compatibility, this sets the virtio-scsi-device bus
1119      * name as before.
1120      */
1121     if (proxy->id) {
1122         bus_name = g_strdup_printf("%s.0", proxy->id);
1123         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
1124         g_free(bus_name);
1125     }
1126
1127     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1128     if (qdev_init(vdev) < 0) {
1129         return -1;
1130     }
1131     return 0;
1132 }
1133
1134 static void virtio_scsi_pci_class_init(ObjectClass *klass, void *data)
1135 {
1136     DeviceClass *dc = DEVICE_CLASS(klass);
1137     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1138     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1139     k->init = virtio_scsi_pci_init_pci;
1140     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1141     dc->props = virtio_scsi_pci_properties;
1142     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1143     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1144     pcidev_k->revision = 0x00;
1145     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1146 }
1147
1148 static void virtio_scsi_pci_instance_init(Object *obj)
1149 {
1150     VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(obj);
1151     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_SCSI);
1152     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1153 }
1154
1155 static const TypeInfo virtio_scsi_pci_info = {
1156     .name          = TYPE_VIRTIO_SCSI_PCI,
1157     .parent        = TYPE_VIRTIO_PCI,
1158     .instance_size = sizeof(VirtIOSCSIPCI),
1159     .instance_init = virtio_scsi_pci_instance_init,
1160     .class_init    = virtio_scsi_pci_class_init,
1161 };
1162
1163 /* vhost-scsi-pci */
1164
1165 #ifdef CONFIG_VHOST_SCSI
1166 static Property vhost_scsi_pci_properties[] = {
1167     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
1168                        DEV_NVECTORS_UNSPECIFIED),
1169     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1170     DEFINE_VHOST_SCSI_PROPERTIES(VHostSCSIPCI, vdev.parent_obj.conf),
1171     DEFINE_PROP_END_OF_LIST(),
1172 };
1173
1174 static int vhost_scsi_pci_init_pci(VirtIOPCIProxy *vpci_dev)
1175 {
1176     VHostSCSIPCI *dev = VHOST_SCSI_PCI(vpci_dev);
1177     DeviceState *vdev = DEVICE(&dev->vdev);
1178     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
1179
1180     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1181         vpci_dev->nvectors = vs->conf.num_queues + 3;
1182     }
1183
1184     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1185     if (qdev_init(vdev) < 0) {
1186         return -1;
1187     }
1188     return 0;
1189 }
1190
1191 static void vhost_scsi_pci_class_init(ObjectClass *klass, void *data)
1192 {
1193     DeviceClass *dc = DEVICE_CLASS(klass);
1194     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1195     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1196     k->init = vhost_scsi_pci_init_pci;
1197     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1198     dc->props = vhost_scsi_pci_properties;
1199     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1200     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1201     pcidev_k->revision = 0x00;
1202     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1203 }
1204
1205 static void vhost_scsi_pci_instance_init(Object *obj)
1206 {
1207     VHostSCSIPCI *dev = VHOST_SCSI_PCI(obj);
1208     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VHOST_SCSI);
1209     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1210 }
1211
1212 static const TypeInfo vhost_scsi_pci_info = {
1213     .name          = TYPE_VHOST_SCSI_PCI,
1214     .parent        = TYPE_VIRTIO_PCI,
1215     .instance_size = sizeof(VHostSCSIPCI),
1216     .instance_init = vhost_scsi_pci_instance_init,
1217     .class_init    = vhost_scsi_pci_class_init,
1218 };
1219 #endif
1220
1221 /* virtio-balloon-pci */
1222
1223 static void balloon_pci_stats_get_all(Object *obj, struct Visitor *v,
1224                                       void *opaque, const char *name,
1225                                       Error **errp)
1226 {
1227     VirtIOBalloonPCI *dev = opaque;
1228     object_property_get(OBJECT(&dev->vdev), v, "guest-stats", errp);
1229 }
1230
1231 static void balloon_pci_stats_get_poll_interval(Object *obj, struct Visitor *v,
1232                                                 void *opaque, const char *name,
1233                                                 Error **errp)
1234 {
1235     VirtIOBalloonPCI *dev = opaque;
1236     object_property_get(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
1237                         errp);
1238 }
1239
1240 static void balloon_pci_stats_set_poll_interval(Object *obj, struct Visitor *v,
1241                                                 void *opaque, const char *name,
1242                                                 Error **errp)
1243 {
1244     VirtIOBalloonPCI *dev = opaque;
1245     object_property_set(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
1246                         errp);
1247 }
1248
1249 static Property virtio_balloon_pci_properties[] = {
1250     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1251     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1252     DEFINE_PROP_END_OF_LIST(),
1253 };
1254
1255 static int virtio_balloon_pci_init(VirtIOPCIProxy *vpci_dev)
1256 {
1257     VirtIOBalloonPCI *dev = VIRTIO_BALLOON_PCI(vpci_dev);
1258     DeviceState *vdev = DEVICE(&dev->vdev);
1259
1260     if (vpci_dev->class_code != PCI_CLASS_OTHERS &&
1261         vpci_dev->class_code != PCI_CLASS_MEMORY_RAM) { /* qemu < 1.1 */
1262         vpci_dev->class_code = PCI_CLASS_OTHERS;
1263     }
1264
1265     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1266     if (qdev_init(vdev) < 0) {
1267         return -1;
1268     }
1269     return 0;
1270 }
1271
1272 static void virtio_balloon_pci_class_init(ObjectClass *klass, void *data)
1273 {
1274     DeviceClass *dc = DEVICE_CLASS(klass);
1275     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1276     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1277     k->init = virtio_balloon_pci_init;
1278     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
1279     dc->props = virtio_balloon_pci_properties;
1280     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1281     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BALLOON;
1282     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1283     pcidev_k->class_id = PCI_CLASS_OTHERS;
1284 }
1285
1286 static void virtio_balloon_pci_instance_init(Object *obj)
1287 {
1288     VirtIOBalloonPCI *dev = VIRTIO_BALLOON_PCI(obj);
1289     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_BALLOON);
1290     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1291
1292     object_property_add(obj, "guest-stats", "guest statistics",
1293                         balloon_pci_stats_get_all, NULL, NULL, dev,
1294                         NULL);
1295
1296     object_property_add(obj, "guest-stats-polling-interval", "int",
1297                         balloon_pci_stats_get_poll_interval,
1298                         balloon_pci_stats_set_poll_interval,
1299                         NULL, dev, NULL);
1300 }
1301
1302 static const TypeInfo virtio_balloon_pci_info = {
1303     .name          = TYPE_VIRTIO_BALLOON_PCI,
1304     .parent        = TYPE_VIRTIO_PCI,
1305     .instance_size = sizeof(VirtIOBalloonPCI),
1306     .instance_init = virtio_balloon_pci_instance_init,
1307     .class_init    = virtio_balloon_pci_class_init,
1308 };
1309
1310 /* virtio-serial-pci */
1311
1312 static int virtio_serial_pci_init(VirtIOPCIProxy *vpci_dev)
1313 {
1314     VirtIOSerialPCI *dev = VIRTIO_SERIAL_PCI(vpci_dev);
1315     DeviceState *vdev = DEVICE(&dev->vdev);
1316     DeviceState *proxy = DEVICE(vpci_dev);
1317     char *bus_name;
1318
1319     if (vpci_dev->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
1320         vpci_dev->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
1321         vpci_dev->class_code != PCI_CLASS_OTHERS) {        /* qemu-kvm  */
1322             vpci_dev->class_code = PCI_CLASS_COMMUNICATION_OTHER;
1323     }
1324
1325     /* backwards-compatibility with machines that were created with
1326        DEV_NVECTORS_UNSPECIFIED */
1327     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1328         vpci_dev->nvectors = dev->vdev.serial.max_virtserial_ports + 1;
1329     }
1330
1331     /*
1332      * For command line compatibility, this sets the virtio-serial-device bus
1333      * name as before.
1334      */
1335     if (proxy->id) {
1336         bus_name = g_strdup_printf("%s.0", proxy->id);
1337         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
1338         g_free(bus_name);
1339     }
1340
1341     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1342     if (qdev_init(vdev) < 0) {
1343         return -1;
1344     }
1345     return 0;
1346 }
1347
1348 static Property virtio_serial_pci_properties[] = {
1349     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1350                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1351     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1352     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1353     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1354     DEFINE_VIRTIO_SERIAL_PROPERTIES(VirtIOSerialPCI, vdev.serial),
1355     DEFINE_PROP_END_OF_LIST(),
1356 };
1357
1358 static void virtio_serial_pci_class_init(ObjectClass *klass, void *data)
1359 {
1360     DeviceClass *dc = DEVICE_CLASS(klass);
1361     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1362     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1363     k->init = virtio_serial_pci_init;
1364     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
1365     dc->props = virtio_serial_pci_properties;
1366     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1367     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_CONSOLE;
1368     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1369     pcidev_k->class_id = PCI_CLASS_COMMUNICATION_OTHER;
1370 }
1371
1372 static void virtio_serial_pci_instance_init(Object *obj)
1373 {
1374     VirtIOSerialPCI *dev = VIRTIO_SERIAL_PCI(obj);
1375     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_SERIAL);
1376     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1377 }
1378
1379 static const TypeInfo virtio_serial_pci_info = {
1380     .name          = TYPE_VIRTIO_SERIAL_PCI,
1381     .parent        = TYPE_VIRTIO_PCI,
1382     .instance_size = sizeof(VirtIOSerialPCI),
1383     .instance_init = virtio_serial_pci_instance_init,
1384     .class_init    = virtio_serial_pci_class_init,
1385 };
1386
1387 /* virtio-net-pci */
1388
1389 static Property virtio_net_properties[] = {
1390     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1391                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
1392     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
1393     DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features),
1394     DEFINE_NIC_PROPERTIES(VirtIONetPCI, vdev.nic_conf),
1395     DEFINE_VIRTIO_NET_PROPERTIES(VirtIONetPCI, vdev.net_conf),
1396     DEFINE_PROP_END_OF_LIST(),
1397 };
1398
1399 static int virtio_net_pci_init(VirtIOPCIProxy *vpci_dev)
1400 {
1401     DeviceState *qdev = DEVICE(vpci_dev);
1402     VirtIONetPCI *dev = VIRTIO_NET_PCI(vpci_dev);
1403     DeviceState *vdev = DEVICE(&dev->vdev);
1404
1405     virtio_net_set_config_size(&dev->vdev, vpci_dev->host_features);
1406     virtio_net_set_netclient_name(&dev->vdev, qdev->id,
1407                                   object_get_typename(OBJECT(qdev)));
1408     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1409     if (qdev_init(vdev) < 0) {
1410         return -1;
1411     }
1412     return 0;
1413 }
1414
1415 static void virtio_net_pci_class_init(ObjectClass *klass, void *data)
1416 {
1417     DeviceClass *dc = DEVICE_CLASS(klass);
1418     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1419     VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass);
1420
1421     k->romfile = "efi-virtio.rom";
1422     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1423     k->device_id = PCI_DEVICE_ID_VIRTIO_NET;
1424     k->revision = VIRTIO_PCI_ABI_VERSION;
1425     k->class_id = PCI_CLASS_NETWORK_ETHERNET;
1426     set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
1427     dc->props = virtio_net_properties;
1428     vpciklass->init = virtio_net_pci_init;
1429 }
1430
1431 static void virtio_net_pci_instance_init(Object *obj)
1432 {
1433     VirtIONetPCI *dev = VIRTIO_NET_PCI(obj);
1434     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_NET);
1435     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1436 }
1437
1438 static const TypeInfo virtio_net_pci_info = {
1439     .name          = TYPE_VIRTIO_NET_PCI,
1440     .parent        = TYPE_VIRTIO_PCI,
1441     .instance_size = sizeof(VirtIONetPCI),
1442     .instance_init = virtio_net_pci_instance_init,
1443     .class_init    = virtio_net_pci_class_init,
1444 };
1445
1446 /* virtio-rng-pci */
1447
1448 static Property virtio_rng_pci_properties[] = {
1449     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1450     DEFINE_VIRTIO_RNG_PROPERTIES(VirtIORngPCI, vdev.conf),
1451     DEFINE_PROP_END_OF_LIST(),
1452 };
1453
1454 static int virtio_rng_pci_init(VirtIOPCIProxy *vpci_dev)
1455 {
1456     VirtIORngPCI *vrng = VIRTIO_RNG_PCI(vpci_dev);
1457     DeviceState *vdev = DEVICE(&vrng->vdev);
1458
1459     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1460     if (qdev_init(vdev) < 0) {
1461         return -1;
1462     }
1463
1464     object_property_set_link(OBJECT(vrng),
1465                              OBJECT(vrng->vdev.conf.rng), "rng",
1466                              NULL);
1467
1468     return 0;
1469 }
1470
1471 static void virtio_rng_pci_class_init(ObjectClass *klass, void *data)
1472 {
1473     DeviceClass *dc = DEVICE_CLASS(klass);
1474     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1475     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1476
1477     k->init = virtio_rng_pci_init;
1478     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
1479     dc->props = virtio_rng_pci_properties;
1480
1481     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1482     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_RNG;
1483     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1484     pcidev_k->class_id = PCI_CLASS_OTHERS;
1485 }
1486
1487 static void virtio_rng_initfn(Object *obj)
1488 {
1489     VirtIORngPCI *dev = VIRTIO_RNG_PCI(obj);
1490     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_RNG);
1491     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1492     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
1493                              (Object **)&dev->vdev.conf.rng, NULL);
1494
1495 }
1496
1497 static const TypeInfo virtio_rng_pci_info = {
1498     .name          = TYPE_VIRTIO_RNG_PCI,
1499     .parent        = TYPE_VIRTIO_PCI,
1500     .instance_size = sizeof(VirtIORngPCI),
1501     .instance_init = virtio_rng_initfn,
1502     .class_init    = virtio_rng_pci_class_init,
1503 };
1504
1505 /* virtio-pci-bus */
1506
1507 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
1508                                VirtIOPCIProxy *dev)
1509 {
1510     DeviceState *qdev = DEVICE(dev);
1511     BusState *qbus;
1512     char virtio_bus_name[] = "virtio-bus";
1513
1514     qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_PCI_BUS, qdev,
1515                         virtio_bus_name);
1516     qbus = BUS(bus);
1517     qbus->allow_hotplug = 1;
1518 }
1519
1520 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
1521 {
1522     BusClass *bus_class = BUS_CLASS(klass);
1523     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
1524     bus_class->max_dev = 1;
1525     k->notify = virtio_pci_notify;
1526     k->save_config = virtio_pci_save_config;
1527     k->load_config = virtio_pci_load_config;
1528     k->save_queue = virtio_pci_save_queue;
1529     k->load_queue = virtio_pci_load_queue;
1530     k->get_features = virtio_pci_get_features;
1531     k->query_guest_notifiers = virtio_pci_query_guest_notifiers;
1532     k->set_host_notifier = virtio_pci_set_host_notifier;
1533     k->set_guest_notifiers = virtio_pci_set_guest_notifiers;
1534     k->vmstate_change = virtio_pci_vmstate_change;
1535     k->device_plugged = virtio_pci_device_plugged;
1536 }
1537
1538 static const TypeInfo virtio_pci_bus_info = {
1539     .name          = TYPE_VIRTIO_PCI_BUS,
1540     .parent        = TYPE_VIRTIO_BUS,
1541     .instance_size = sizeof(VirtioPCIBusState),
1542     .class_init    = virtio_pci_bus_class_init,
1543 };
1544
1545 static void virtio_pci_register_types(void)
1546 {
1547     type_register_static(&virtio_rng_pci_info);
1548     type_register_static(&virtio_pci_bus_info);
1549     type_register_static(&virtio_pci_info);
1550 #ifdef CONFIG_VIRTFS
1551     type_register_static(&virtio_9p_pci_info);
1552 #endif
1553     type_register_static(&virtio_blk_pci_info);
1554     type_register_static(&virtio_scsi_pci_info);
1555     type_register_static(&virtio_balloon_pci_info);
1556     type_register_static(&virtio_serial_pci_info);
1557     type_register_static(&virtio_net_pci_info);
1558 #ifdef CONFIG_VHOST_SCSI
1559     type_register_static(&vhost_scsi_pci_info);
1560 #endif
1561 }
1562
1563 type_init(virtio_pci_register_types)