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 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
  93                                VirtIOPCIProxy *dev);
  94
  95 /* virtio device */
  96 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */
  97 static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d)
  98 {
  99     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 100 }
 101
 102 /* DeviceState to VirtIOPCIProxy. Note: used on datapath,
 103  * be careful and test performance if you change this.
 104  */
 105 static inline VirtIOPCIProxy *to_virtio_pci_proxy_fast(DeviceState *d)
 106 {
 107     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 108 }
 109
 110 static void virtio_pci_notify(DeviceState *d, uint16_t vector)
 111 {
 112     VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(d);
 113
 114     if (msix_enabled(&proxy->pci_dev))
 115         msix_notify(&proxy->pci_dev, vector);
 116     else {
 117         VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 118         pci_set_irq(&proxy->pci_dev, vdev->isr & 1);
 119     }
 120 }
 121
 122 static void virtio_pci_save_config(DeviceState *d, QEMUFile *f)
 123 {
 124     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 125     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 126
 127     pci_device_save(&proxy->pci_dev, f);
 128     msix_save(&proxy->pci_dev, f);
 129     if (msix_present(&proxy->pci_dev))
 130         qemu_put_be16(f, vdev->config_vector);
 131 }
 132
 133 static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f)
 134 {
 135     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 136     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 137
 138     if (msix_present(&proxy->pci_dev))
 139         qemu_put_be16(f, virtio_queue_vector(vdev, n));
 140 }
 141
 142 static int virtio_pci_load_config(DeviceState *d, QEMUFile *f)
 143 {
 144     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 145     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 146
 147     int ret;
 148     ret = pci_device_load(&proxy->pci_dev, f);
 149     if (ret) {
 150         return ret;
 151     }
 152     msix_unuse_all_vectors(&proxy->pci_dev);
 153     msix_load(&proxy->pci_dev, f);
 154     if (msix_present(&proxy->pci_dev)) {
 155         qemu_get_be16s(f, &vdev->config_vector);
 156     } else {
 157         vdev->config_vector = VIRTIO_NO_VECTOR;
 158     }
 159     if (vdev->config_vector != VIRTIO_NO_VECTOR) {
 160         return msix_vector_use(&proxy->pci_dev, vdev->config_vector);
 161     }
 162     return 0;
 163 }
 164
 165 static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f)
 166 {
 167     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 168     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 169
 170     uint16_t vector;
 171     if (msix_present(&proxy->pci_dev)) {
 172         qemu_get_be16s(f, &vector);
 173     } else {
 174         vector = VIRTIO_NO_VECTOR;
 175     }
 176     virtio_queue_set_vector(vdev, n, vector);
 177     if (vector != VIRTIO_NO_VECTOR) {
 178         return msix_vector_use(&proxy->pci_dev, vector);
 179     }
 180     return 0;
 181 }
 182
 183 static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy,
 184                                                  int n, bool assign, bool set_handler)
 185 {
 186     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 187     VirtQueue *vq = virtio_get_queue(vdev, n);
 188     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
 189     int r = 0;
 190
 191     if (assign) {
 192         r = event_notifier_init(notifier, 1);
 193         if (r < 0) {
 194             error_report("%s: unable to init event notifier: %d",
 195                          __func__, r);
 196             return r;
 197         }
 198         virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
 199         memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 200                                   true, n, notifier);
 201     } else {
 202         memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 203                                   true, n, notifier);
 204         virtio_queue_set_host_notifier_fd_handler(vq, false, false);
 205         event_notifier_cleanup(notifier);
 206     }
 207     return r;
 208 }
 209
 210 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
 211 {
 212     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 213     int n, r;
 214
 215     if (!(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) ||
 216         proxy->ioeventfd_disabled ||
 217         proxy->ioeventfd_started) {
 218         return;
 219     }
 220
 221     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 222         if (!virtio_queue_get_num(vdev, n)) {
 223             continue;
 224         }
 225
 226         r = virtio_pci_set_host_notifier_internal(proxy, n, true, true);
 227         if (r < 0) {
 228             goto assign_error;
 229         }
 230     }
 231     proxy->ioeventfd_started = true;
 232     return;
 233
 234 assign_error:
 235     while (--n >= 0) {
 236         if (!virtio_queue_get_num(vdev, n)) {
 237             continue;
 238         }
 239
 240         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 241         assert(r >= 0);
 242     }
 243     proxy->ioeventfd_started = false;
 244     error_report("%s: failed. Fallback to a userspace (slower).", __func__);
 245 }
 246
 247 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
 248 {
 249     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 250     int r;
 251     int n;
 252
 253     if (!proxy->ioeventfd_started) {
 254         return;
 255     }
 256
 257     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 258         if (!virtio_queue_get_num(vdev, n)) {
 259             continue;
 260         }
 261
 262         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 263         assert(r >= 0);
 264     }
 265     proxy->ioeventfd_started = false;
 266 }
 267
 268 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 269 {
 270     VirtIOPCIProxy *proxy = opaque;
 271     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 272     hwaddr pa;
 273
 274     switch (addr) {
 275     case VIRTIO_PCI_GUEST_FEATURES:
 276         /* Guest does not negotiate properly?  We have to assume nothing. */
 277         if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
 278             val = virtio_bus_get_vdev_bad_features(&proxy->bus);
 279         }
 280         virtio_set_features(vdev, val);
 281         break;
 282     case VIRTIO_PCI_QUEUE_PFN:
 283         pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 284         if (pa == 0) {
 285             virtio_pci_stop_ioeventfd(proxy);
 286             virtio_reset(vdev);
 287             msix_unuse_all_vectors(&proxy->pci_dev);
 288         }
 289         else
 290             virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
 291         break;
 292     case VIRTIO_PCI_QUEUE_SEL:
 293         if (val < VIRTIO_PCI_QUEUE_MAX)
 294             vdev->queue_sel = val;
 295         break;
 296     case VIRTIO_PCI_QUEUE_NOTIFY:
 297         if (val < VIRTIO_PCI_QUEUE_MAX) {
 298             virtio_queue_notify(vdev, val);
 299         }
 300         break;
 301     case VIRTIO_PCI_STATUS:
 302         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
 303             virtio_pci_stop_ioeventfd(proxy);
 304         }
 305
 306         virtio_set_status(vdev, val & 0xFF);
 307
 308         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
 309             virtio_pci_start_ioeventfd(proxy);
 310         }
 311
 312         if (vdev->status == 0) {
 313             virtio_reset(vdev);
 314             msix_unuse_all_vectors(&proxy->pci_dev);
 315         }
 316
 317         /* Linux before 2.6.34 sets the device as OK without enabling
 318            the PCI device bus master bit. In this case we need to disable
 319            some safety checks. */
 320         if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
 321             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 322             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 323         }
 324         break;
 325     case VIRTIO_MSI_CONFIG_VECTOR:
 326         msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
 327         /* Make it possible for guest to discover an error took place. */
 328         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 329             val = VIRTIO_NO_VECTOR;
 330         vdev->config_vector = val;
 331         break;
 332     case VIRTIO_MSI_QUEUE_VECTOR:
 333         msix_vector_unuse(&proxy->pci_dev,
 334                           virtio_queue_vector(vdev, vdev->queue_sel));
 335         /* Make it possible for guest to discover an error took place. */
 336         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 337             val = VIRTIO_NO_VECTOR;
 338         virtio_queue_set_vector(vdev, vdev->queue_sel, val);
 339         break;
 340     default:
 341         error_report("%s: unexpected address 0x%x value 0x%x",
 342                      __func__, addr, val);
 343         break;
 344     }
 345 }
 346
 347 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
 348 {
 349     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 350     uint32_t ret = 0xFFFFFFFF;
 351
 352     switch (addr) {
 353     case VIRTIO_PCI_HOST_FEATURES:
 354         ret = proxy->host_features;
 355         break;
 356     case VIRTIO_PCI_GUEST_FEATURES:
 357         ret = vdev->guest_features;
 358         break;
 359     case VIRTIO_PCI_QUEUE_PFN:
 360         ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
 361               >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 362         break;
 363     case VIRTIO_PCI_QUEUE_NUM:
 364         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
 365         break;
 366     case VIRTIO_PCI_QUEUE_SEL:
 367         ret = vdev->queue_sel;
 368         break;
 369     case VIRTIO_PCI_STATUS:
 370         ret = vdev->status;
 371         break;
 372     case VIRTIO_PCI_ISR:
 373         /* reading from the ISR also clears it. */
 374         ret = vdev->isr;
 375         vdev->isr = 0;
 376         pci_irq_deassert(&proxy->pci_dev);
 377         break;
 378     case VIRTIO_MSI_CONFIG_VECTOR:
 379         ret = vdev->config_vector;
 380         break;
 381     case VIRTIO_MSI_QUEUE_VECTOR:
 382         ret = virtio_queue_vector(vdev, vdev->queue_sel);
 383         break;
 384     default:
 385         break;
 386     }
 387
 388     return ret;
 389 }
 390
 391 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
 392                                        unsigned size)
 393 {
 394     VirtIOPCIProxy *proxy = opaque;
 395     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 396     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 397     uint64_t val = 0;
 398     if (addr < config) {
 399         return virtio_ioport_read(proxy, addr);
 400     }
 401     addr -= config;
 402
 403     switch (size) {
 404     case 1:
 405         val = virtio_config_readb(vdev, addr);
 406         break;
 407     case 2:
 408         val = virtio_config_readw(vdev, addr);
 409         if (virtio_is_big_endian(vdev)) {
 410             val = bswap16(val);
 411         }
 412         break;
 413     case 4:
 414         val = virtio_config_readl(vdev, addr);
 415         if (virtio_is_big_endian(vdev)) {
 416             val = bswap32(val);
 417         }
 418         break;
 419     }
 420     return val;
 421 }
 422
 423 static void virtio_pci_config_write(void *opaque, hwaddr addr,
 424                                     uint64_t val, unsigned size)
 425 {
 426     VirtIOPCIProxy *proxy = opaque;
 427     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 428     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 429     if (addr < config) {
 430         virtio_ioport_write(proxy, addr, val);
 431         return;
 432     }
 433     addr -= config;
 434     /*
 435      * Virtio-PCI is odd. Ioports are LE but config space is target native
 436      * endian.
 437      */
 438     switch (size) {
 439     case 1:
 440         virtio_config_writeb(vdev, addr, val);
 441         break;
 442     case 2:
 443         if (virtio_is_big_endian(vdev)) {
 444             val = bswap16(val);
 445         }
 446         virtio_config_writew(vdev, addr, val);
 447         break;
 448     case 4:
 449         if (virtio_is_big_endian(vdev)) {
 450             val = bswap32(val);
 451         }
 452         virtio_config_writel(vdev, addr, val);
 453         break;
 454     }
 455 }
 456
 457 static const MemoryRegionOps virtio_pci_config_ops = {
 458     .read = virtio_pci_config_read,
 459     .write = virtio_pci_config_write,
 460     .impl = {
 461         .min_access_size = 1,
 462         .max_access_size = 4,
 463     },
 464     .endianness = DEVICE_LITTLE_ENDIAN,
 465 };
 466
 467 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 468                                 uint32_t val, int len)
 469 {
 470     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 471     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 472
 473     pci_default_write_config(pci_dev, address, val, len);
 474
 475     if (range_covers_byte(address, len, PCI_COMMAND) &&
 476         !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER) &&
 477         !(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
 478         virtio_pci_stop_ioeventfd(proxy);
 479         virtio_set_status(vdev, vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
 480     }
 481 }
 482
 483 static unsigned virtio_pci_get_features(DeviceState *d)
 484 {
 485     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 486     return proxy->host_features;
 487 }
 488
 489 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
 490                                         unsigned int queue_no,
 491                                         unsigned int vector,
 492                                         MSIMessage msg)
 493 {
 494     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 495     int ret;
 496
 497     if (irqfd->users == 0) {
 498         ret = kvm_irqchip_add_msi_route(kvm_state, msg);
 499         if (ret < 0) {
 500             return ret;
 501         }
 502         irqfd->virq = ret;
 503     }
 504     irqfd->users++;
 505     return 0;
 506 }
 507
 508 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
 509                                              unsigned int vector)
 510 {
 511     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 512     if (--irqfd->users == 0) {
 513         kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 514     }
 515 }
 516
 517 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
 518                                  unsigned int queue_no,
 519                                  unsigned int vector)
 520 {
 521     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 522     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 523     VirtQueue *vq = virtio_get_queue(vdev, queue_no);
 524     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 525     int ret;
 526     ret = kvm_irqchip_add_irqfd_notifier(kvm_state, n, NULL, irqfd->virq);
 527     return ret;
 528 }
 529
 530 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
 531                                       unsigned int queue_no,
 532                                       unsigned int vector)
 533 {
 534     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 535     VirtQueue *vq = virtio_get_queue(vdev, queue_no);
 536     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 537     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 538     int ret;
 539
 540     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, n, irqfd->virq);
 541     assert(ret == 0);
 542 }
 543
 544 static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
 545 {
 546     PCIDevice *dev = &proxy->pci_dev;
 547     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 548     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 549     unsigned int vector;
 550     int ret, queue_no;
 551     MSIMessage msg;
 552
 553     for (queue_no = 0; queue_no < nvqs; queue_no++) {
 554         if (!virtio_queue_get_num(vdev, queue_no)) {
 555             break;
 556         }
 557         vector = virtio_queue_vector(vdev, queue_no);
 558         if (vector >= msix_nr_vectors_allocated(dev)) {
 559             continue;
 560         }
 561         msg = msix_get_message(dev, vector);
 562         ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector, msg);
 563         if (ret < 0) {
 564             goto undo;
 565         }
 566         /* If guest supports masking, set up irqfd now.
 567          * Otherwise, delay until unmasked in the frontend.
 568          */
 569         if (k->guest_notifier_mask) {
 570             ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
 571             if (ret < 0) {
 572                 kvm_virtio_pci_vq_vector_release(proxy, vector);
 573                 goto undo;
 574             }
 575         }
 576     }
 577     return 0;
 578
 579 undo:
 580     while (--queue_no >= 0) {
 581         vector = virtio_queue_vector(vdev, queue_no);
 582         if (vector >= msix_nr_vectors_allocated(dev)) {
 583             continue;
 584         }
 585         if (k->guest_notifier_mask) {
 586             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 587         }
 588         kvm_virtio_pci_vq_vector_release(proxy, vector);
 589     }
 590     return ret;
 591 }
 592
 593 static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
 594 {
 595     PCIDevice *dev = &proxy->pci_dev;
 596     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 597     unsigned int vector;
 598     int queue_no;
 599     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 600
 601     for (queue_no = 0; queue_no < nvqs; queue_no++) {
 602         if (!virtio_queue_get_num(vdev, queue_no)) {
 603             break;
 604         }
 605         vector = virtio_queue_vector(vdev, queue_no);
 606         if (vector >= msix_nr_vectors_allocated(dev)) {
 607             continue;
 608         }
 609         /* If guest supports masking, clean up irqfd now.
 610          * Otherwise, it was cleaned when masked in the frontend.
 611          */
 612         if (k->guest_notifier_mask) {
 613             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 614         }
 615         kvm_virtio_pci_vq_vector_release(proxy, vector);
 616     }
 617 }
 618
 619 static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
 620                                        unsigned int queue_no,
 621                                        unsigned int vector,
 622                                        MSIMessage msg)
 623 {
 624     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 625     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 626     VirtQueue *vq = virtio_get_queue(vdev, queue_no);
 627     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 628     VirtIOIRQFD *irqfd;
 629     int ret = 0;
 630
 631     if (proxy->vector_irqfd) {
 632         irqfd = &proxy->vector_irqfd[vector];
 633         if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) {
 634             ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg);
 635             if (ret < 0) {
 636                 return ret;
 637             }
 638         }
 639     }
 640
 641     /* If guest supports masking, irqfd is already setup, unmask it.
 642      * Otherwise, set it up now.
 643      */
 644     if (k->guest_notifier_mask) {
 645         k->guest_notifier_mask(vdev, queue_no, false);
 646         /* Test after unmasking to avoid losing events. */
 647         if (k->guest_notifier_pending &&
 648             k->guest_notifier_pending(vdev, queue_no)) {
 649             event_notifier_set(n);
 650         }
 651     } else {
 652         ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
 653     }
 654     return ret;
 655 }
 656
 657 static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
 658                                              unsigned int queue_no,
 659                                              unsigned int vector)
 660 {
 661     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 662     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 663
 664     /* If guest supports masking, keep irqfd but mask it.
 665      * Otherwise, clean it up now.
 666      */
 667     if (k->guest_notifier_mask) {
 668         k->guest_notifier_mask(vdev, queue_no, true);
 669     } else {
 670         kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 671     }
 672 }
 673
 674 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
 675                                     MSIMessage msg)
 676 {
 677     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 678     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 679     int ret, queue_no;
 680
 681     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 682         if (!virtio_queue_get_num(vdev, queue_no)) {
 683             break;
 684         }
 685         if (virtio_queue_vector(vdev, queue_no) != vector) {
 686             continue;
 687         }
 688         ret = virtio_pci_vq_vector_unmask(proxy, queue_no, vector, msg);
 689         if (ret < 0) {
 690             goto undo;
 691         }
 692     }
 693     return 0;
 694
 695 undo:
 696     while (--queue_no >= 0) {
 697         if (virtio_queue_vector(vdev, queue_no) != vector) {
 698             continue;
 699         }
 700         virtio_pci_vq_vector_mask(proxy, queue_no, vector);
 701     }
 702     return ret;
 703 }
 704
 705 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
 706 {
 707     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 708     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 709     int queue_no;
 710
 711     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 712         if (!virtio_queue_get_num(vdev, queue_no)) {
 713             break;
 714         }
 715         if (virtio_queue_vector(vdev, queue_no) != vector) {
 716             continue;
 717         }
 718         virtio_pci_vq_vector_mask(proxy, queue_no, vector);
 719     }
 720 }
 721
 722 static void virtio_pci_vector_poll(PCIDevice *dev,
 723                                    unsigned int vector_start,
 724                                    unsigned int vector_end)
 725 {
 726     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 727     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 728     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 729     int queue_no;
 730     unsigned int vector;
 731     EventNotifier *notifier;
 732     VirtQueue *vq;
 733
 734     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 735         if (!virtio_queue_get_num(vdev, queue_no)) {
 736             break;
 737         }
 738         vector = virtio_queue_vector(vdev, queue_no);
 739         if (vector < vector_start || vector >= vector_end ||
 740             !msix_is_masked(dev, vector)) {
 741             continue;
 742         }
 743         vq = virtio_get_queue(vdev, queue_no);
 744         notifier = virtio_queue_get_guest_notifier(vq);
 745         if (k->guest_notifier_pending) {
 746             if (k->guest_notifier_pending(vdev, queue_no)) {
 747                 msix_set_pending(dev, vector);
 748             }
 749         } else if (event_notifier_test_and_clear(notifier)) {
 750             msix_set_pending(dev, vector);
 751         }
 752     }
 753 }
 754
 755 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
 756                                          bool with_irqfd)
 757 {
 758     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 759     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 760     VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
 761     VirtQueue *vq = virtio_get_queue(vdev, n);
 762     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 763
 764     if (assign) {
 765         int r = event_notifier_init(notifier, 0);
 766         if (r < 0) {
 767             return r;
 768         }
 769         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
 770     } else {
 771         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
 772         event_notifier_cleanup(notifier);
 773     }
 774
 775     if (!msix_enabled(&proxy->pci_dev) && vdc->guest_notifier_mask) {
 776         vdc->guest_notifier_mask(vdev, n, !assign);
 777     }
 778
 779     return 0;
 780 }
 781
 782 static bool virtio_pci_query_guest_notifiers(DeviceState *d)
 783 {
 784     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 785     return msix_enabled(&proxy->pci_dev);
 786 }
 787
 788 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
 789 {
 790     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 791     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 792     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 793     int r, n;
 794     bool with_irqfd = msix_enabled(&proxy->pci_dev) &&
 795         kvm_msi_via_irqfd_enabled();
 796
 797     nvqs = MIN(nvqs, VIRTIO_PCI_QUEUE_MAX);
 798
 799     /* When deassigning, pass a consistent nvqs value
 800      * to avoid leaking notifiers.
 801      */
 802     assert(assign || nvqs == proxy->nvqs_with_notifiers);
 803
 804     proxy->nvqs_with_notifiers = nvqs;
 805
 806     /* Must unset vector notifier while guest notifier is still assigned */
 807     if ((proxy->vector_irqfd || k->guest_notifier_mask) && !assign) {
 808         msix_unset_vector_notifiers(&proxy->pci_dev);
 809         if (proxy->vector_irqfd) {
 810             kvm_virtio_pci_vector_release(proxy, nvqs);
 811             g_free(proxy->vector_irqfd);
 812             proxy->vector_irqfd = NULL;
 813         }
 814     }
 815
 816     for (n = 0; n < nvqs; n++) {
 817         if (!virtio_queue_get_num(vdev, n)) {
 818             break;
 819         }
 820
 821         r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd);
 822         if (r < 0) {
 823             goto assign_error;
 824         }
 825     }
 826
 827     /* Must set vector notifier after guest notifier has been assigned */
 828     if ((with_irqfd || k->guest_notifier_mask) && assign) {
 829         if (with_irqfd) {
 830             proxy->vector_irqfd =
 831                 g_malloc0(sizeof(*proxy->vector_irqfd) *
 832                           msix_nr_vectors_allocated(&proxy->pci_dev));
 833             r = kvm_virtio_pci_vector_use(proxy, nvqs);
 834             if (r < 0) {
 835                 goto assign_error;
 836             }
 837         }
 838         r = msix_set_vector_notifiers(&proxy->pci_dev,
 839                                       virtio_pci_vector_unmask,
 840                                       virtio_pci_vector_mask,
 841                                       virtio_pci_vector_poll);
 842         if (r < 0) {
 843             goto notifiers_error;
 844         }
 845     }
 846
 847     return 0;
 848
 849 notifiers_error:
 850     if (with_irqfd) {
 851         assert(assign);
 852         kvm_virtio_pci_vector_release(proxy, nvqs);
 853     }
 854
 855 assign_error:
 856     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
 857     assert(assign);
 858     while (--n >= 0) {
 859         virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd);
 860     }
 861     return r;
 862 }
 863
 864 static int virtio_pci_set_host_notifier(DeviceState *d, int n, bool assign)
 865 {
 866     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 867
 868     /* Stop using ioeventfd for virtqueue kick if the device starts using host
 869      * notifiers.  This makes it easy to avoid stepping on each others' toes.
 870      */
 871     proxy->ioeventfd_disabled = assign;
 872     if (assign) {
 873         virtio_pci_stop_ioeventfd(proxy);
 874     }
 875     /* We don't need to start here: it's not needed because backend
 876      * currently only stops on status change away from ok,
 877      * reset, vmstop and such. If we do add code to start here,
 878      * need to check vmstate, device state etc. */
 879     return virtio_pci_set_host_notifier_internal(proxy, n, assign, false);
 880 }
 881
 882 static void virtio_pci_vmstate_change(DeviceState *d, bool running)
 883 {
 884     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 885     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 886
 887     if (running) {
 888         /* Try to find out if the guest has bus master disabled, but is
 889            in ready state. Then we have a buggy guest OS. */
 890         if ((vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
 891             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 892             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 893         }
 894         virtio_pci_start_ioeventfd(proxy);
 895     } else {
 896         virtio_pci_stop_ioeventfd(proxy);
 897     }
 898 }
 899
 900 #ifdef CONFIG_VIRTFS
 901 static int virtio_9p_init_pci(VirtIOPCIProxy *vpci_dev)
 902 {
 903     V9fsPCIState *dev = VIRTIO_9P_PCI(vpci_dev);
 904     DeviceState *vdev = DEVICE(&dev->vdev);
 905
 906     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
 907     if (qdev_init(vdev) < 0) {
 908         return -1;
 909     }
 910     return 0;
 911 }
 912
 913 static Property virtio_9p_pci_properties[] = {
 914     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
 915                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
 916     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
 917     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
 918     DEFINE_VIRTIO_9P_PROPERTIES(V9fsPCIState, vdev.fsconf),
 919     DEFINE_PROP_END_OF_LIST(),
 920 };
 921
 922 static void virtio_9p_pci_class_init(ObjectClass *klass, void *data)
 923 {
 924     DeviceClass *dc = DEVICE_CLASS(klass);
 925     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
 926     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
 927
 928     k->init = virtio_9p_init_pci;
 929     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
 930     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_9P;
 931     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
 932     pcidev_k->class_id = 0x2;
 933     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 934     dc->props = virtio_9p_pci_properties;
 935 }
 936
 937 static void virtio_9p_pci_instance_init(Object *obj)
 938 {
 939     V9fsPCIState *dev = VIRTIO_9P_PCI(obj);
 940     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_9P);
 941     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
 942 }
 943
 944 static const TypeInfo virtio_9p_pci_info = {
 945     .name          = TYPE_VIRTIO_9P_PCI,
 946     .parent        = TYPE_VIRTIO_PCI,
 947     .instance_size = sizeof(V9fsPCIState),
 948     .instance_init = virtio_9p_pci_instance_init,
 949     .class_init    = virtio_9p_pci_class_init,
 950 };
 951 #endif /* CONFIG_VIRTFS */
 952
 953 /*
 954  * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
 955  */
 956
 957 /* This is called by virtio-bus just after the device is plugged. */
 958 static void virtio_pci_device_plugged(DeviceState *d)
 959 {
 960     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
 961     VirtioBusState *bus = &proxy->bus;
 962     uint8_t *config;
 963     uint32_t size;
 964
 965     config = proxy->pci_dev.config;
 966     if (proxy->class_code) {
 967         pci_config_set_class(config, proxy->class_code);
 968     }
 969     pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
 970                  pci_get_word(config + PCI_VENDOR_ID));
 971     pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus));
 972     config[PCI_INTERRUPT_PIN] = 1;
 973
 974     if (proxy->nvectors &&
 975         msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1)) {
 976         error_report("unable to init msix vectors to %" PRIu32,
 977                      proxy->nvectors);
 978         proxy->nvectors = 0;
 979     }
 980
 981     proxy->pci_dev.config_write = virtio_write_config;
 982
 983     size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev)
 984          + virtio_bus_get_vdev_config_len(bus);
 985     if (size & (size - 1)) {
 986         size = 1 << qemu_fls(size);
 987     }
 988
 989     memory_region_init_io(&proxy->bar, OBJECT(proxy), &virtio_pci_config_ops,
 990                           proxy, "virtio-pci", size);
 991     pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
 992                      &proxy->bar);
 993
 994     if (!kvm_has_many_ioeventfds()) {
 995         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
 996     }
 997
 998     proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
 999     proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
1000     proxy->host_features = virtio_bus_get_vdev_features(bus,
1001                                                       proxy->host_features);
1002 }
1003
1004 static void virtio_pci_device_unplugged(DeviceState *d)
1005 {
1006     PCIDevice *pci_dev = PCI_DEVICE(d);
1007     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1008
1009     virtio_pci_stop_ioeventfd(proxy);
1010     msix_uninit_exclusive_bar(pci_dev);
1011 }
1012
1013 static int virtio_pci_init(PCIDevice *pci_dev)
1014 {
1015     VirtIOPCIProxy *dev = VIRTIO_PCI(pci_dev);
1016     VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
1017     virtio_pci_bus_new(&dev->bus, sizeof(dev->bus), dev);
1018     if (k->init != NULL) {
1019         return k->init(dev);
1020     }
1021     return 0;
1022 }
1023
1024 static void virtio_pci_exit(PCIDevice *pci_dev)
1025 {
1026     VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
1027     memory_region_destroy(&proxy->bar);
1028 }
1029
1030 static void virtio_pci_reset(DeviceState *qdev)
1031 {
1032     VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
1033     VirtioBusState *bus = VIRTIO_BUS(&proxy->bus);
1034     virtio_pci_stop_ioeventfd(proxy);
1035     virtio_bus_reset(bus);
1036     msix_unuse_all_vectors(&proxy->pci_dev);
1037     proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
1038 }
1039
1040 static void virtio_pci_class_init(ObjectClass *klass, void *data)
1041 {
1042     DeviceClass *dc = DEVICE_CLASS(klass);
1043     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1044
1045     k->init = virtio_pci_init;
1046     k->exit = virtio_pci_exit;
1047     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1048     k->revision = VIRTIO_PCI_ABI_VERSION;
1049     k->class_id = PCI_CLASS_OTHERS;
1050     dc->reset = virtio_pci_reset;
1051 }
1052
1053 static const TypeInfo virtio_pci_info = {
1054     .name          = TYPE_VIRTIO_PCI,
1055     .parent        = TYPE_PCI_DEVICE,
1056     .instance_size = sizeof(VirtIOPCIProxy),
1057     .class_init    = virtio_pci_class_init,
1058     .class_size    = sizeof(VirtioPCIClass),
1059     .abstract      = true,
1060 };
1061
1062 /* virtio-blk-pci */
1063
1064 static Property virtio_blk_pci_properties[] = {
1065     DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
1066     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1067                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1068     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1069     DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features),
1070     DEFINE_PROP_END_OF_LIST(),
1071 };
1072
1073 static int virtio_blk_pci_init(VirtIOPCIProxy *vpci_dev)
1074 {
1075     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(vpci_dev);
1076     DeviceState *vdev = DEVICE(&dev->vdev);
1077     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1078     if (qdev_init(vdev) < 0) {
1079         return -1;
1080     }
1081     return 0;
1082 }
1083
1084 static void virtio_blk_pci_class_init(ObjectClass *klass, void *data)
1085 {
1086     DeviceClass *dc = DEVICE_CLASS(klass);
1087     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1088     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1089
1090     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1091     dc->props = virtio_blk_pci_properties;
1092     k->init = virtio_blk_pci_init;
1093     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1094     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
1095     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1096     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1097 }
1098
1099 static void virtio_blk_pci_instance_init(Object *obj)
1100 {
1101     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(obj);
1102     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_BLK);
1103     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1104     object_unref(OBJECT(&dev->vdev));
1105     qdev_alias_all_properties(DEVICE(&dev->vdev), obj);
1106     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev),"iothread",
1107                               &error_abort);
1108 }
1109
1110 static const TypeInfo virtio_blk_pci_info = {
1111     .name          = TYPE_VIRTIO_BLK_PCI,
1112     .parent        = TYPE_VIRTIO_PCI,
1113     .instance_size = sizeof(VirtIOBlkPCI),
1114     .instance_init = virtio_blk_pci_instance_init,
1115     .class_init    = virtio_blk_pci_class_init,
1116 };
1117
1118 /* virtio-scsi-pci */
1119
1120 static Property virtio_scsi_pci_properties[] = {
1121     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1122                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1123     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
1124                        DEV_NVECTORS_UNSPECIFIED),
1125     DEFINE_VIRTIO_SCSI_FEATURES(VirtIOPCIProxy, host_features),
1126     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSIPCI, vdev.parent_obj.conf),
1127     DEFINE_PROP_END_OF_LIST(),
1128 };
1129
1130 static int virtio_scsi_pci_init_pci(VirtIOPCIProxy *vpci_dev)
1131 {
1132     VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(vpci_dev);
1133     DeviceState *vdev = DEVICE(&dev->vdev);
1134     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
1135     DeviceState *proxy = DEVICE(vpci_dev);
1136     char *bus_name;
1137
1138     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1139         vpci_dev->nvectors = vs->conf.num_queues + 3;
1140     }
1141
1142     /*
1143      * For command line compatibility, this sets the virtio-scsi-device bus
1144      * name as before.
1145      */
1146     if (proxy->id) {
1147         bus_name = g_strdup_printf("%s.0", proxy->id);
1148         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
1149         g_free(bus_name);
1150     }
1151
1152     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1153     if (qdev_init(vdev) < 0) {
1154         return -1;
1155     }
1156     return 0;
1157 }
1158
1159 static void virtio_scsi_pci_class_init(ObjectClass *klass, void *data)
1160 {
1161     DeviceClass *dc = DEVICE_CLASS(klass);
1162     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1163     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1164     k->init = virtio_scsi_pci_init_pci;
1165     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1166     dc->props = virtio_scsi_pci_properties;
1167     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1168     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1169     pcidev_k->revision = 0x00;
1170     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1171 }
1172
1173 static void virtio_scsi_pci_instance_init(Object *obj)
1174 {
1175     VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(obj);
1176     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_SCSI);
1177     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1178 }
1179
1180 static const TypeInfo virtio_scsi_pci_info = {
1181     .name          = TYPE_VIRTIO_SCSI_PCI,
1182     .parent        = TYPE_VIRTIO_PCI,
1183     .instance_size = sizeof(VirtIOSCSIPCI),
1184     .instance_init = virtio_scsi_pci_instance_init,
1185     .class_init    = virtio_scsi_pci_class_init,
1186 };
1187
1188 /* vhost-scsi-pci */
1189
1190 #ifdef CONFIG_VHOST_SCSI
1191 static Property vhost_scsi_pci_properties[] = {
1192     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
1193                        DEV_NVECTORS_UNSPECIFIED),
1194     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1195     DEFINE_VHOST_SCSI_PROPERTIES(VHostSCSIPCI, vdev.parent_obj.conf),
1196     DEFINE_PROP_END_OF_LIST(),
1197 };
1198
1199 static int vhost_scsi_pci_init_pci(VirtIOPCIProxy *vpci_dev)
1200 {
1201     VHostSCSIPCI *dev = VHOST_SCSI_PCI(vpci_dev);
1202     DeviceState *vdev = DEVICE(&dev->vdev);
1203     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
1204
1205     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1206         vpci_dev->nvectors = vs->conf.num_queues + 3;
1207     }
1208
1209     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1210     if (qdev_init(vdev) < 0) {
1211         return -1;
1212     }
1213     return 0;
1214 }
1215
1216 static void vhost_scsi_pci_class_init(ObjectClass *klass, void *data)
1217 {
1218     DeviceClass *dc = DEVICE_CLASS(klass);
1219     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1220     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1221     k->init = vhost_scsi_pci_init_pci;
1222     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1223     dc->props = vhost_scsi_pci_properties;
1224     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1225     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1226     pcidev_k->revision = 0x00;
1227     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1228 }
1229
1230 static void vhost_scsi_pci_instance_init(Object *obj)
1231 {
1232     VHostSCSIPCI *dev = VHOST_SCSI_PCI(obj);
1233     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VHOST_SCSI);
1234     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1235 }
1236
1237 static const TypeInfo vhost_scsi_pci_info = {
1238     .name          = TYPE_VHOST_SCSI_PCI,
1239     .parent        = TYPE_VIRTIO_PCI,
1240     .instance_size = sizeof(VHostSCSIPCI),
1241     .instance_init = vhost_scsi_pci_instance_init,
1242     .class_init    = vhost_scsi_pci_class_init,
1243 };
1244 #endif
1245
1246 /* virtio-balloon-pci */
1247
1248 static void balloon_pci_stats_get_all(Object *obj, struct Visitor *v,
1249                                       void *opaque, const char *name,
1250                                       Error **errp)
1251 {
1252     VirtIOBalloonPCI *dev = opaque;
1253     object_property_get(OBJECT(&dev->vdev), v, "guest-stats", errp);
1254 }
1255
1256 static void balloon_pci_stats_get_poll_interval(Object *obj, struct Visitor *v,
1257                                                 void *opaque, const char *name,
1258                                                 Error **errp)
1259 {
1260     VirtIOBalloonPCI *dev = opaque;
1261     object_property_get(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
1262                         errp);
1263 }
1264
1265 static void balloon_pci_stats_set_poll_interval(Object *obj, struct Visitor *v,
1266                                                 void *opaque, const char *name,
1267                                                 Error **errp)
1268 {
1269     VirtIOBalloonPCI *dev = opaque;
1270     object_property_set(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
1271                         errp);
1272 }
1273
1274 static Property virtio_balloon_pci_properties[] = {
1275     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1276     DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
1277     DEFINE_PROP_END_OF_LIST(),
1278 };
1279
1280 static int virtio_balloon_pci_init(VirtIOPCIProxy *vpci_dev)
1281 {
1282     VirtIOBalloonPCI *dev = VIRTIO_BALLOON_PCI(vpci_dev);
1283     DeviceState *vdev = DEVICE(&dev->vdev);
1284
1285     if (vpci_dev->class_code != PCI_CLASS_OTHERS &&
1286         vpci_dev->class_code != PCI_CLASS_MEMORY_RAM) { /* qemu < 1.1 */
1287         vpci_dev->class_code = PCI_CLASS_OTHERS;
1288     }
1289
1290     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1291     if (qdev_init(vdev) < 0) {
1292         return -1;
1293     }
1294     return 0;
1295 }
1296
1297 static void virtio_balloon_pci_class_init(ObjectClass *klass, void *data)
1298 {
1299     DeviceClass *dc = DEVICE_CLASS(klass);
1300     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1301     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1302     k->init = virtio_balloon_pci_init;
1303     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
1304     dc->props = virtio_balloon_pci_properties;
1305     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1306     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BALLOON;
1307     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1308     pcidev_k->class_id = PCI_CLASS_OTHERS;
1309 }
1310
1311 static void virtio_balloon_pci_instance_init(Object *obj)
1312 {
1313     VirtIOBalloonPCI *dev = VIRTIO_BALLOON_PCI(obj);
1314     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_BALLOON);
1315     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1316
1317     object_property_add(obj, "guest-stats", "guest statistics",
1318                         balloon_pci_stats_get_all, NULL, NULL, dev,
1319                         NULL);
1320
1321     object_property_add(obj, "guest-stats-polling-interval", "int",
1322                         balloon_pci_stats_get_poll_interval,
1323                         balloon_pci_stats_set_poll_interval,
1324                         NULL, dev, NULL);
1325 }
1326
1327 static const TypeInfo virtio_balloon_pci_info = {
1328     .name          = TYPE_VIRTIO_BALLOON_PCI,
1329     .parent        = TYPE_VIRTIO_PCI,
1330     .instance_size = sizeof(VirtIOBalloonPCI),
1331     .instance_init = virtio_balloon_pci_instance_init,
1332     .class_init    = virtio_balloon_pci_class_init,
1333 };
1334
1335 /* virtio-serial-pci */
1336
1337 static int virtio_serial_pci_init(VirtIOPCIProxy *vpci_dev)
1338 {
1339     VirtIOSerialPCI *dev = VIRTIO_SERIAL_PCI(vpci_dev);
1340     DeviceState *vdev = DEVICE(&dev->vdev);
1341     DeviceState *proxy = DEVICE(vpci_dev);
1342     char *bus_name;
1343
1344     if (vpci_dev->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
1345         vpci_dev->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
1346         vpci_dev->class_code != PCI_CLASS_OTHERS) {        /* qemu-kvm  */
1347             vpci_dev->class_code = PCI_CLASS_COMMUNICATION_OTHER;
1348     }
1349
1350     /* backwards-compatibility with machines that were created with
1351        DEV_NVECTORS_UNSPECIFIED */
1352     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1353         vpci_dev->nvectors = dev->vdev.serial.max_virtserial_ports + 1;
1354     }
1355
1356     /*
1357      * For command line compatibility, this sets the virtio-serial-device bus
1358      * name as before.
1359      */
1360     if (proxy->id) {
1361         bus_name = g_strdup_printf("%s.0", proxy->id);
1362         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
1363         g_free(bus_name);
1364     }
1365
1366     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1367     if (qdev_init(vdev) < 0) {
1368         return -1;
1369     }
1370     return 0;
1371 }
1372
1373 static Property virtio_serial_pci_properties[] = {
1374     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1375                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1376     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1377     DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
1378     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1379     DEFINE_VIRTIO_SERIAL_PROPERTIES(VirtIOSerialPCI, vdev.serial),
1380     DEFINE_PROP_END_OF_LIST(),
1381 };
1382
1383 static void virtio_serial_pci_class_init(ObjectClass *klass, void *data)
1384 {
1385     DeviceClass *dc = DEVICE_CLASS(klass);
1386     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1387     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1388     k->init = virtio_serial_pci_init;
1389     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
1390     dc->props = virtio_serial_pci_properties;
1391     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1392     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_CONSOLE;
1393     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1394     pcidev_k->class_id = PCI_CLASS_COMMUNICATION_OTHER;
1395 }
1396
1397 static void virtio_serial_pci_instance_init(Object *obj)
1398 {
1399     VirtIOSerialPCI *dev = VIRTIO_SERIAL_PCI(obj);
1400     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_SERIAL);
1401     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1402 }
1403
1404 static const TypeInfo virtio_serial_pci_info = {
1405     .name          = TYPE_VIRTIO_SERIAL_PCI,
1406     .parent        = TYPE_VIRTIO_PCI,
1407     .instance_size = sizeof(VirtIOSerialPCI),
1408     .instance_init = virtio_serial_pci_instance_init,
1409     .class_init    = virtio_serial_pci_class_init,
1410 };
1411
1412 /* virtio-net-pci */
1413
1414 static Property virtio_net_properties[] = {
1415     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1416                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
1417     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
1418     DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features),
1419     DEFINE_NIC_PROPERTIES(VirtIONetPCI, vdev.nic_conf),
1420     DEFINE_VIRTIO_NET_PROPERTIES(VirtIONetPCI, vdev.net_conf),
1421     DEFINE_PROP_END_OF_LIST(),
1422 };
1423
1424 static int virtio_net_pci_init(VirtIOPCIProxy *vpci_dev)
1425 {
1426     DeviceState *qdev = DEVICE(vpci_dev);
1427     VirtIONetPCI *dev = VIRTIO_NET_PCI(vpci_dev);
1428     DeviceState *vdev = DEVICE(&dev->vdev);
1429
1430     virtio_net_set_config_size(&dev->vdev, vpci_dev->host_features);
1431     virtio_net_set_netclient_name(&dev->vdev, qdev->id,
1432                                   object_get_typename(OBJECT(qdev)));
1433     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1434     if (qdev_init(vdev) < 0) {
1435         return -1;
1436     }
1437     return 0;
1438 }
1439
1440 static void virtio_net_pci_class_init(ObjectClass *klass, void *data)
1441 {
1442     DeviceClass *dc = DEVICE_CLASS(klass);
1443     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1444     VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass);
1445
1446     k->romfile = "efi-virtio.rom";
1447     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1448     k->device_id = PCI_DEVICE_ID_VIRTIO_NET;
1449     k->revision = VIRTIO_PCI_ABI_VERSION;
1450     k->class_id = PCI_CLASS_NETWORK_ETHERNET;
1451     set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
1452     dc->props = virtio_net_properties;
1453     vpciklass->init = virtio_net_pci_init;
1454 }
1455
1456 static void virtio_net_pci_instance_init(Object *obj)
1457 {
1458     VirtIONetPCI *dev = VIRTIO_NET_PCI(obj);
1459     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_NET);
1460     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1461 }
1462
1463 static const TypeInfo virtio_net_pci_info = {
1464     .name          = TYPE_VIRTIO_NET_PCI,
1465     .parent        = TYPE_VIRTIO_PCI,
1466     .instance_size = sizeof(VirtIONetPCI),
1467     .instance_init = virtio_net_pci_instance_init,
1468     .class_init    = virtio_net_pci_class_init,
1469 };
1470
1471 /* virtio-rng-pci */
1472
1473 static Property virtio_rng_pci_properties[] = {
1474     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1475     DEFINE_VIRTIO_RNG_PROPERTIES(VirtIORngPCI, vdev.conf),
1476     DEFINE_PROP_END_OF_LIST(),
1477 };
1478
1479 static int virtio_rng_pci_init(VirtIOPCIProxy *vpci_dev)
1480 {
1481     VirtIORngPCI *vrng = VIRTIO_RNG_PCI(vpci_dev);
1482     DeviceState *vdev = DEVICE(&vrng->vdev);
1483
1484     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1485     if (qdev_init(vdev) < 0) {
1486         return -1;
1487     }
1488
1489     object_property_set_link(OBJECT(vrng),
1490                              OBJECT(vrng->vdev.conf.rng), "rng",
1491                              NULL);
1492
1493     return 0;
1494 }
1495
1496 static void virtio_rng_pci_class_init(ObjectClass *klass, void *data)
1497 {
1498     DeviceClass *dc = DEVICE_CLASS(klass);
1499     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1500     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1501
1502     k->init = virtio_rng_pci_init;
1503     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
1504     dc->props = virtio_rng_pci_properties;
1505
1506     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1507     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_RNG;
1508     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1509     pcidev_k->class_id = PCI_CLASS_OTHERS;
1510 }
1511
1512 static void virtio_rng_initfn(Object *obj)
1513 {
1514     VirtIORngPCI *dev = VIRTIO_RNG_PCI(obj);
1515     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_RNG);
1516     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1517     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
1518                              (Object **)&dev->vdev.conf.rng,
1519                              qdev_prop_allow_set_link_before_realize,
1520                              OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL);
1521
1522 }
1523
1524 static const TypeInfo virtio_rng_pci_info = {
1525     .name          = TYPE_VIRTIO_RNG_PCI,
1526     .parent        = TYPE_VIRTIO_PCI,
1527     .instance_size = sizeof(VirtIORngPCI),
1528     .instance_init = virtio_rng_initfn,
1529     .class_init    = virtio_rng_pci_class_init,
1530 };
1531
1532 /* virtio-pci-bus */
1533
1534 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
1535                                VirtIOPCIProxy *dev)
1536 {
1537     DeviceState *qdev = DEVICE(dev);
1538     BusState *qbus;
1539     char virtio_bus_name[] = "virtio-bus";
1540
1541     qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_PCI_BUS, qdev,
1542                         virtio_bus_name);
1543     qbus = BUS(bus);
1544     qbus->allow_hotplug = 1;
1545 }
1546
1547 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
1548 {
1549     BusClass *bus_class = BUS_CLASS(klass);
1550     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
1551     bus_class->max_dev = 1;
1552     k->notify = virtio_pci_notify;
1553     k->save_config = virtio_pci_save_config;
1554     k->load_config = virtio_pci_load_config;
1555     k->save_queue = virtio_pci_save_queue;
1556     k->load_queue = virtio_pci_load_queue;
1557     k->get_features = virtio_pci_get_features;
1558     k->query_guest_notifiers = virtio_pci_query_guest_notifiers;
1559     k->set_host_notifier = virtio_pci_set_host_notifier;
1560     k->set_guest_notifiers = virtio_pci_set_guest_notifiers;
1561     k->vmstate_change = virtio_pci_vmstate_change;
1562     k->device_plugged = virtio_pci_device_plugged;
1563     k->device_unplugged = virtio_pci_device_unplugged;
1564 }
1565
1566 static const TypeInfo virtio_pci_bus_info = {
1567     .name          = TYPE_VIRTIO_PCI_BUS,
1568     .parent        = TYPE_VIRTIO_BUS,
1569     .instance_size = sizeof(VirtioPCIBusState),
1570     .class_init    = virtio_pci_bus_class_init,
1571 };
1572
1573 static void virtio_pci_register_types(void)
1574 {
1575     type_register_static(&virtio_rng_pci_info);
1576     type_register_static(&virtio_pci_bus_info);
1577     type_register_static(&virtio_pci_info);
1578 #ifdef CONFIG_VIRTFS
1579     type_register_static(&virtio_9p_pci_info);
1580 #endif
1581     type_register_static(&virtio_blk_pci_info);
1582     type_register_static(&virtio_scsi_pci_info);
1583     type_register_static(&virtio_balloon_pci_info);
1584     type_register_static(&virtio_serial_pci_info);
1585     type_register_static(&virtio_net_pci_info);
1586 #ifdef CONFIG_VHOST_SCSI
1587     type_register_static(&vhost_scsi_pci_info);
1588 #endif
1589 }
1590
1591 type_init(virtio_pci_register_types)