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