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/block-backend.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 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
  90                                VirtIOPCIProxy *dev);
  91
  92 /* virtio device */
  93 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */
  94 static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d)
  95 {
  96     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
  97 }
  98
  99 /* DeviceState to VirtIOPCIProxy. Note: used on datapath,
 100  * be careful and test performance if you change this.
 101  */
 102 static inline VirtIOPCIProxy *to_virtio_pci_proxy_fast(DeviceState *d)
 103 {
 104     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 105 }
 106
 107 static void virtio_pci_notify(DeviceState *d, uint16_t vector)
 108 {
 109     VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(d);
 110
 111     if (msix_enabled(&proxy->pci_dev))
 112         msix_notify(&proxy->pci_dev, vector);
 113     else {
 114         VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 115         pci_set_irq(&proxy->pci_dev, vdev->isr & 1);
 116     }
 117 }
 118
 119 static void virtio_pci_save_config(DeviceState *d, QEMUFile *f)
 120 {
 121     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 122     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 123
 124     pci_device_save(&proxy->pci_dev, f);
 125     msix_save(&proxy->pci_dev, f);
 126     if (msix_present(&proxy->pci_dev))
 127         qemu_put_be16(f, vdev->config_vector);
 128 }
 129
 130 static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f)
 131 {
 132     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 133     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 134
 135     if (msix_present(&proxy->pci_dev))
 136         qemu_put_be16(f, virtio_queue_vector(vdev, n));
 137 }
 138
 139 static int virtio_pci_load_config(DeviceState *d, QEMUFile *f)
 140 {
 141     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 142     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 143
 144     int ret;
 145     ret = pci_device_load(&proxy->pci_dev, f);
 146     if (ret) {
 147         return ret;
 148     }
 149     msix_unuse_all_vectors(&proxy->pci_dev);
 150     msix_load(&proxy->pci_dev, f);
 151     if (msix_present(&proxy->pci_dev)) {
 152         qemu_get_be16s(f, &vdev->config_vector);
 153     } else {
 154         vdev->config_vector = VIRTIO_NO_VECTOR;
 155     }
 156     if (vdev->config_vector != VIRTIO_NO_VECTOR) {
 157         return msix_vector_use(&proxy->pci_dev, vdev->config_vector);
 158     }
 159     return 0;
 160 }
 161
 162 static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f)
 163 {
 164     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 165     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 166
 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(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     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 184     VirtQueue *vq = virtio_get_queue(vdev, n);
 185     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
 186     int r = 0;
 187
 188     if (assign) {
 189         r = event_notifier_init(notifier, 1);
 190         if (r < 0) {
 191             error_report("%s: unable to init event notifier: %d",
 192                          __func__, r);
 193             return r;
 194         }
 195         virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
 196         memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 197                                   true, n, notifier);
 198     } else {
 199         memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 200                                   true, n, notifier);
 201         virtio_queue_set_host_notifier_fd_handler(vq, false, false);
 202         event_notifier_cleanup(notifier);
 203     }
 204     return r;
 205 }
 206
 207 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
 208 {
 209     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 210     int n, r;
 211
 212     if (!(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) ||
 213         proxy->ioeventfd_disabled ||
 214         proxy->ioeventfd_started) {
 215         return;
 216     }
 217
 218     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 219         if (!virtio_queue_get_num(vdev, n)) {
 220             continue;
 221         }
 222
 223         r = virtio_pci_set_host_notifier_internal(proxy, n, true, true);
 224         if (r < 0) {
 225             goto assign_error;
 226         }
 227     }
 228     proxy->ioeventfd_started = true;
 229     return;
 230
 231 assign_error:
 232     while (--n >= 0) {
 233         if (!virtio_queue_get_num(vdev, n)) {
 234             continue;
 235         }
 236
 237         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 238         assert(r >= 0);
 239     }
 240     proxy->ioeventfd_started = false;
 241     error_report("%s: failed. Fallback to a userspace (slower).", __func__);
 242 }
 243
 244 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
 245 {
 246     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 247     int r;
 248     int n;
 249
 250     if (!proxy->ioeventfd_started) {
 251         return;
 252     }
 253
 254     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 255         if (!virtio_queue_get_num(vdev, n)) {
 256             continue;
 257         }
 258
 259         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 260         assert(r >= 0);
 261     }
 262     proxy->ioeventfd_started = false;
 263 }
 264
 265 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 266 {
 267     VirtIOPCIProxy *proxy = opaque;
 268     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 269     hwaddr pa;
 270
 271     switch (addr) {
 272     case VIRTIO_PCI_GUEST_FEATURES:
 273         /* Guest does not negotiate properly?  We have to assume nothing. */
 274         if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
 275             val = virtio_bus_get_vdev_bad_features(&proxy->bus);
 276         }
 277         virtio_set_features(vdev, val);
 278         break;
 279     case VIRTIO_PCI_QUEUE_PFN:
 280         pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 281         if (pa == 0) {
 282             virtio_pci_stop_ioeventfd(proxy);
 283             virtio_reset(vdev);
 284             msix_unuse_all_vectors(&proxy->pci_dev);
 285         }
 286         else
 287             virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
 288         break;
 289     case VIRTIO_PCI_QUEUE_SEL:
 290         if (val < VIRTIO_PCI_QUEUE_MAX)
 291             vdev->queue_sel = val;
 292         break;
 293     case VIRTIO_PCI_QUEUE_NOTIFY:
 294         if (val < VIRTIO_PCI_QUEUE_MAX) {
 295             virtio_queue_notify(vdev, val);
 296         }
 297         break;
 298     case VIRTIO_PCI_STATUS:
 299         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
 300             virtio_pci_stop_ioeventfd(proxy);
 301         }
 302
 303         virtio_set_status(vdev, val & 0xFF);
 304
 305         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
 306             virtio_pci_start_ioeventfd(proxy);
 307         }
 308
 309         if (vdev->status == 0) {
 310             virtio_reset(vdev);
 311             msix_unuse_all_vectors(&proxy->pci_dev);
 312         }
 313
 314         /* Linux before 2.6.34 drives the device without enabling
 315            the PCI device bus master bit. Enable it automatically
 316            for the guest. This is a PCI spec violation but so is
 317            initiating DMA with bus master bit clear. */
 318         if (val == (VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER)) {
 319             pci_default_write_config(&proxy->pci_dev, PCI_COMMAND,
 320                                      proxy->pci_dev.config[PCI_COMMAND] |
 321                                      PCI_COMMAND_MASTER, 1);
 322         }
 323         break;
 324     case VIRTIO_MSI_CONFIG_VECTOR:
 325         msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
 326         /* Make it possible for guest to discover an error took place. */
 327         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 328             val = VIRTIO_NO_VECTOR;
 329         vdev->config_vector = val;
 330         break;
 331     case VIRTIO_MSI_QUEUE_VECTOR:
 332         msix_vector_unuse(&proxy->pci_dev,
 333                           virtio_queue_vector(vdev, vdev->queue_sel));
 334         /* Make it possible for guest to discover an error took place. */
 335         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 336             val = VIRTIO_NO_VECTOR;
 337         virtio_queue_set_vector(vdev, vdev->queue_sel, val);
 338         break;
 339     default:
 340         error_report("%s: unexpected address 0x%x value 0x%x",
 341                      __func__, addr, val);
 342         break;
 343     }
 344 }
 345
 346 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
 347 {
 348     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 349     uint32_t ret = 0xFFFFFFFF;
 350
 351     switch (addr) {
 352     case VIRTIO_PCI_HOST_FEATURES:
 353         ret = proxy->host_features;
 354         break;
 355     case VIRTIO_PCI_GUEST_FEATURES:
 356         ret = vdev->guest_features;
 357         break;
 358     case VIRTIO_PCI_QUEUE_PFN:
 359         ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
 360               >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 361         break;
 362     case VIRTIO_PCI_QUEUE_NUM:
 363         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
 364         break;
 365     case VIRTIO_PCI_QUEUE_SEL:
 366         ret = vdev->queue_sel;
 367         break;
 368     case VIRTIO_PCI_STATUS:
 369         ret = vdev->status;
 370         break;
 371     case VIRTIO_PCI_ISR:
 372         /* reading from the ISR also clears it. */
 373         ret = vdev->isr;
 374         vdev->isr = 0;
 375         pci_irq_deassert(&proxy->pci_dev);
 376         break;
 377     case VIRTIO_MSI_CONFIG_VECTOR:
 378         ret = vdev->config_vector;
 379         break;
 380     case VIRTIO_MSI_QUEUE_VECTOR:
 381         ret = virtio_queue_vector(vdev, vdev->queue_sel);
 382         break;
 383     default:
 384         break;
 385     }
 386
 387     return ret;
 388 }
 389
 390 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr,
 391                                        unsigned size)
 392 {
 393     VirtIOPCIProxy *proxy = opaque;
 394     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 395     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 396     uint64_t val = 0;
 397     if (addr < config) {
 398         return virtio_ioport_read(proxy, addr);
 399     }
 400     addr -= config;
 401
 402     switch (size) {
 403     case 1:
 404         val = virtio_config_readb(vdev, addr);
 405         break;
 406     case 2:
 407         val = virtio_config_readw(vdev, addr);
 408         if (virtio_is_big_endian(vdev)) {
 409             val = bswap16(val);
 410         }
 411         break;
 412     case 4:
 413         val = virtio_config_readl(vdev, addr);
 414         if (virtio_is_big_endian(vdev)) {
 415             val = bswap32(val);
 416         }
 417         break;
 418     }
 419     return val;
 420 }
 421
 422 static void virtio_pci_config_write(void *opaque, hwaddr addr,
 423                                     uint64_t val, unsigned size)
 424 {
 425     VirtIOPCIProxy *proxy = opaque;
 426     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 427     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 428     if (addr < config) {
 429         virtio_ioport_write(proxy, addr, val);
 430         return;
 431     }
 432     addr -= config;
 433     /*
 434      * Virtio-PCI is odd. Ioports are LE but config space is target native
 435      * endian.
 436      */
 437     switch (size) {
 438     case 1:
 439         virtio_config_writeb(vdev, addr, val);
 440         break;
 441     case 2:
 442         if (virtio_is_big_endian(vdev)) {
 443             val = bswap16(val);
 444         }
 445         virtio_config_writew(vdev, addr, val);
 446         break;
 447     case 4:
 448         if (virtio_is_big_endian(vdev)) {
 449             val = bswap32(val);
 450         }
 451         virtio_config_writel(vdev, addr, val);
 452         break;
 453     }
 454 }
 455
 456 static const MemoryRegionOps virtio_pci_config_ops = {
 457     .read = virtio_pci_config_read,
 458     .write = virtio_pci_config_write,
 459     .impl = {
 460         .min_access_size = 1,
 461         .max_access_size = 4,
 462     },
 463     .endianness = DEVICE_LITTLE_ENDIAN,
 464 };
 465
 466 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 467                                 uint32_t val, int len)
 468 {
 469     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 470     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 471
 472     pci_default_write_config(pci_dev, address, val, len);
 473
 474     if (range_covers_byte(address, len, PCI_COMMAND) &&
 475         !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 476         virtio_pci_stop_ioeventfd(proxy);
 477         virtio_set_status(vdev, vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
 478     }
 479 }
 480
 481 static unsigned virtio_pci_get_features(DeviceState *d)
 482 {
 483     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 484     return proxy->host_features;
 485 }
 486
 487 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
 488                                         unsigned int queue_no,
 489                                         unsigned int vector,
 490                                         MSIMessage msg)
 491 {
 492     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 493     int ret;
 494
 495     if (irqfd->users == 0) {
 496         ret = kvm_irqchip_add_msi_route(kvm_state, msg);
 497         if (ret < 0) {
 498             return ret;
 499         }
 500         irqfd->virq = ret;
 501     }
 502     irqfd->users++;
 503     return 0;
 504 }
 505
 506 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
 507                                              unsigned int vector)
 508 {
 509     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 510     if (--irqfd->users == 0) {
 511         kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 512     }
 513 }
 514
 515 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
 516                                  unsigned int queue_no,
 517                                  unsigned int vector)
 518 {
 519     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 520     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 521     VirtQueue *vq = virtio_get_queue(vdev, queue_no);
 522     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 523     int ret;
 524     ret = kvm_irqchip_add_irqfd_notifier(kvm_state, n, NULL, irqfd->virq);
 525     return ret;
 526 }
 527
 528 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
 529                                       unsigned int queue_no,
 530                                       unsigned int vector)
 531 {
 532     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 533     VirtQueue *vq = virtio_get_queue(vdev, queue_no);
 534     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 535     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 536     int ret;
 537
 538     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, n, irqfd->virq);
 539     assert(ret == 0);
 540 }
 541
 542 static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
 543 {
 544     PCIDevice *dev = &proxy->pci_dev;
 545     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 546     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 547     unsigned int vector;
 548     int ret, queue_no;
 549     MSIMessage msg;
 550
 551     for (queue_no = 0; queue_no < nvqs; queue_no++) {
 552         if (!virtio_queue_get_num(vdev, queue_no)) {
 553             break;
 554         }
 555         vector = virtio_queue_vector(vdev, queue_no);
 556         if (vector >= msix_nr_vectors_allocated(dev)) {
 557             continue;
 558         }
 559         msg = msix_get_message(dev, vector);
 560         ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector, msg);
 561         if (ret < 0) {
 562             goto undo;
 563         }
 564         /* If guest supports masking, set up irqfd now.
 565          * Otherwise, delay until unmasked in the frontend.
 566          */
 567         if (k->guest_notifier_mask) {
 568             ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
 569             if (ret < 0) {
 570                 kvm_virtio_pci_vq_vector_release(proxy, vector);
 571                 goto undo;
 572             }
 573         }
 574     }
 575     return 0;
 576
 577 undo:
 578     while (--queue_no >= 0) {
 579         vector = virtio_queue_vector(vdev, queue_no);
 580         if (vector >= msix_nr_vectors_allocated(dev)) {
 581             continue;
 582         }
 583         if (k->guest_notifier_mask) {
 584             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 585         }
 586         kvm_virtio_pci_vq_vector_release(proxy, vector);
 587     }
 588     return ret;
 589 }
 590
 591 static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
 592 {
 593     PCIDevice *dev = &proxy->pci_dev;
 594     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 595     unsigned int vector;
 596     int queue_no;
 597     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 598
 599     for (queue_no = 0; queue_no < nvqs; queue_no++) {
 600         if (!virtio_queue_get_num(vdev, queue_no)) {
 601             break;
 602         }
 603         vector = virtio_queue_vector(vdev, queue_no);
 604         if (vector >= msix_nr_vectors_allocated(dev)) {
 605             continue;
 606         }
 607         /* If guest supports masking, clean up irqfd now.
 608          * Otherwise, it was cleaned when masked in the frontend.
 609          */
 610         if (k->guest_notifier_mask) {
 611             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 612         }
 613         kvm_virtio_pci_vq_vector_release(proxy, vector);
 614     }
 615 }
 616
 617 static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
 618                                        unsigned int queue_no,
 619                                        unsigned int vector,
 620                                        MSIMessage msg)
 621 {
 622     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 623     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 624     VirtQueue *vq = virtio_get_queue(vdev, queue_no);
 625     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 626     VirtIOIRQFD *irqfd;
 627     int ret = 0;
 628
 629     if (proxy->vector_irqfd) {
 630         irqfd = &proxy->vector_irqfd[vector];
 631         if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) {
 632             ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg);
 633             if (ret < 0) {
 634                 return ret;
 635             }
 636         }
 637     }
 638
 639     /* If guest supports masking, irqfd is already setup, unmask it.
 640      * Otherwise, set it up now.
 641      */
 642     if (k->guest_notifier_mask) {
 643         k->guest_notifier_mask(vdev, queue_no, false);
 644         /* Test after unmasking to avoid losing events. */
 645         if (k->guest_notifier_pending &&
 646             k->guest_notifier_pending(vdev, queue_no)) {
 647             event_notifier_set(n);
 648         }
 649     } else {
 650         ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
 651     }
 652     return ret;
 653 }
 654
 655 static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
 656                                              unsigned int queue_no,
 657                                              unsigned int vector)
 658 {
 659     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 660     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 661
 662     /* If guest supports masking, keep irqfd but mask it.
 663      * Otherwise, clean it up now.
 664      */
 665     if (k->guest_notifier_mask) {
 666         k->guest_notifier_mask(vdev, queue_no, true);
 667     } else {
 668         kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 669     }
 670 }
 671
 672 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
 673                                     MSIMessage msg)
 674 {
 675     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 676     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 677     int ret, queue_no;
 678
 679     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 680         if (!virtio_queue_get_num(vdev, queue_no)) {
 681             break;
 682         }
 683         if (virtio_queue_vector(vdev, queue_no) != vector) {
 684             continue;
 685         }
 686         ret = virtio_pci_vq_vector_unmask(proxy, queue_no, vector, msg);
 687         if (ret < 0) {
 688             goto undo;
 689         }
 690     }
 691     return 0;
 692
 693 undo:
 694     while (--queue_no >= 0) {
 695         if (virtio_queue_vector(vdev, queue_no) != vector) {
 696             continue;
 697         }
 698         virtio_pci_vq_vector_mask(proxy, queue_no, vector);
 699     }
 700     return ret;
 701 }
 702
 703 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
 704 {
 705     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 706     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 707     int queue_no;
 708
 709     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 710         if (!virtio_queue_get_num(vdev, queue_no)) {
 711             break;
 712         }
 713         if (virtio_queue_vector(vdev, queue_no) != vector) {
 714             continue;
 715         }
 716         virtio_pci_vq_vector_mask(proxy, queue_no, vector);
 717     }
 718 }
 719
 720 static void virtio_pci_vector_poll(PCIDevice *dev,
 721                                    unsigned int vector_start,
 722                                    unsigned int vector_end)
 723 {
 724     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 725     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 726     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 727     int queue_no;
 728     unsigned int vector;
 729     EventNotifier *notifier;
 730     VirtQueue *vq;
 731
 732     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 733         if (!virtio_queue_get_num(vdev, queue_no)) {
 734             break;
 735         }
 736         vector = virtio_queue_vector(vdev, queue_no);
 737         if (vector < vector_start || vector >= vector_end ||
 738             !msix_is_masked(dev, vector)) {
 739             continue;
 740         }
 741         vq = virtio_get_queue(vdev, queue_no);
 742         notifier = virtio_queue_get_guest_notifier(vq);
 743         if (k->guest_notifier_pending) {
 744             if (k->guest_notifier_pending(vdev, queue_no)) {
 745                 msix_set_pending(dev, vector);
 746             }
 747         } else if (event_notifier_test_and_clear(notifier)) {
 748             msix_set_pending(dev, vector);
 749         }
 750     }
 751 }
 752
 753 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
 754                                          bool with_irqfd)
 755 {
 756     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 757     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 758     VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
 759     VirtQueue *vq = virtio_get_queue(vdev, n);
 760     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 761
 762     if (assign) {
 763         int r = event_notifier_init(notifier, 0);
 764         if (r < 0) {
 765             return r;
 766         }
 767         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
 768     } else {
 769         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
 770         event_notifier_cleanup(notifier);
 771     }
 772
 773     if (!msix_enabled(&proxy->pci_dev) && vdc->guest_notifier_mask) {
 774         vdc->guest_notifier_mask(vdev, n, !assign);
 775     }
 776
 777     return 0;
 778 }
 779
 780 static bool virtio_pci_query_guest_notifiers(DeviceState *d)
 781 {
 782     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 783     return msix_enabled(&proxy->pci_dev);
 784 }
 785
 786 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
 787 {
 788     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 789     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 790     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
 791     int r, n;
 792     bool with_irqfd = msix_enabled(&proxy->pci_dev) &&
 793         kvm_msi_via_irqfd_enabled();
 794
 795     nvqs = MIN(nvqs, VIRTIO_PCI_QUEUE_MAX);
 796
 797     /* When deassigning, pass a consistent nvqs value
 798      * to avoid leaking notifiers.
 799      */
 800     assert(assign || nvqs == proxy->nvqs_with_notifiers);
 801
 802     proxy->nvqs_with_notifiers = nvqs;
 803
 804     /* Must unset vector notifier while guest notifier is still assigned */
 805     if ((proxy->vector_irqfd || k->guest_notifier_mask) && !assign) {
 806         msix_unset_vector_notifiers(&proxy->pci_dev);
 807         if (proxy->vector_irqfd) {
 808             kvm_virtio_pci_vector_release(proxy, nvqs);
 809             g_free(proxy->vector_irqfd);
 810             proxy->vector_irqfd = NULL;
 811         }
 812     }
 813
 814     for (n = 0; n < nvqs; n++) {
 815         if (!virtio_queue_get_num(vdev, n)) {
 816             break;
 817         }
 818
 819         r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd);
 820         if (r < 0) {
 821             goto assign_error;
 822         }
 823     }
 824
 825     /* Must set vector notifier after guest notifier has been assigned */
 826     if ((with_irqfd || k->guest_notifier_mask) && assign) {
 827         if (with_irqfd) {
 828             proxy->vector_irqfd =
 829                 g_malloc0(sizeof(*proxy->vector_irqfd) *
 830                           msix_nr_vectors_allocated(&proxy->pci_dev));
 831             r = kvm_virtio_pci_vector_use(proxy, nvqs);
 832             if (r < 0) {
 833                 goto assign_error;
 834             }
 835         }
 836         r = msix_set_vector_notifiers(&proxy->pci_dev,
 837                                       virtio_pci_vector_unmask,
 838                                       virtio_pci_vector_mask,
 839                                       virtio_pci_vector_poll);
 840         if (r < 0) {
 841             goto notifiers_error;
 842         }
 843     }
 844
 845     return 0;
 846
 847 notifiers_error:
 848     if (with_irqfd) {
 849         assert(assign);
 850         kvm_virtio_pci_vector_release(proxy, nvqs);
 851     }
 852
 853 assign_error:
 854     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
 855     assert(assign);
 856     while (--n >= 0) {
 857         virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd);
 858     }
 859     return r;
 860 }
 861
 862 static int virtio_pci_set_host_notifier(DeviceState *d, int n, bool assign)
 863 {
 864     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 865
 866     /* Stop using ioeventfd for virtqueue kick if the device starts using host
 867      * notifiers.  This makes it easy to avoid stepping on each others' toes.
 868      */
 869     proxy->ioeventfd_disabled = assign;
 870     if (assign) {
 871         virtio_pci_stop_ioeventfd(proxy);
 872     }
 873     /* We don't need to start here: it's not needed because backend
 874      * currently only stops on status change away from ok,
 875      * reset, vmstop and such. If we do add code to start here,
 876      * need to check vmstate, device state etc. */
 877     return virtio_pci_set_host_notifier_internal(proxy, n, assign, false);
 878 }
 879
 880 static void virtio_pci_vmstate_change(DeviceState *d, bool running)
 881 {
 882     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 883     VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
 884
 885     if (running) {
 886         /* Old QEMU versions did not set bus master enable on status write.
 887          * Detect DRIVER set and enable it.
 888          */
 889         if ((proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION) &&
 890             (vdev->status & VIRTIO_CONFIG_S_DRIVER) &&
 891             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 892             pci_default_write_config(&proxy->pci_dev, PCI_COMMAND,
 893                                      proxy->pci_dev.config[PCI_COMMAND] |
 894                                      PCI_COMMAND_MASTER, 1);
 895         }
 896         virtio_pci_start_ioeventfd(proxy);
 897     } else {
 898         virtio_pci_stop_ioeventfd(proxy);
 899     }
 900 }
 901
 902 #ifdef CONFIG_VIRTFS
 903 static int virtio_9p_init_pci(VirtIOPCIProxy *vpci_dev)
 904 {
 905     V9fsPCIState *dev = VIRTIO_9P_PCI(vpci_dev);
 906     DeviceState *vdev = DEVICE(&dev->vdev);
 907
 908     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
 909     if (qdev_init(vdev) < 0) {
 910         return -1;
 911     }
 912     return 0;
 913 }
 914
 915 static Property virtio_9p_pci_properties[] = {
 916     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
 917                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
 918     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
 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
 941     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 942                                 TYPE_VIRTIO_9P);
 943 }
 944
 945 static const TypeInfo virtio_9p_pci_info = {
 946     .name          = TYPE_VIRTIO_9P_PCI,
 947     .parent        = TYPE_VIRTIO_PCI,
 948     .instance_size = sizeof(V9fsPCIState),
 949     .instance_init = virtio_9p_pci_instance_init,
 950     .class_init    = virtio_9p_pci_class_init,
 951 };
 952 #endif /* CONFIG_VIRTFS */
 953
 954 /*
 955  * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
 956  */
 957
 958 /* This is called by virtio-bus just after the device is plugged. */
 959 static void virtio_pci_device_plugged(DeviceState *d)
 960 {
 961     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
 962     VirtioBusState *bus = &proxy->bus;
 963     uint8_t *config;
 964     uint32_t size;
 965
 966     config = proxy->pci_dev.config;
 967     if (proxy->class_code) {
 968         pci_config_set_class(config, proxy->class_code);
 969     }
 970     pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
 971                  pci_get_word(config + PCI_VENDOR_ID));
 972     pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus));
 973     config[PCI_INTERRUPT_PIN] = 1;
 974
 975     if (proxy->nvectors &&
 976         msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1)) {
 977         error_report("unable to init msix vectors to %" PRIu32,
 978                      proxy->nvectors);
 979         proxy->nvectors = 0;
 980     }
 981
 982     proxy->pci_dev.config_write = virtio_write_config;
 983
 984     size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev)
 985          + virtio_bus_get_vdev_config_len(bus);
 986     if (size & (size - 1)) {
 987         size = 1 << qemu_fls(size);
 988     }
 989
 990     memory_region_init_io(&proxy->bar, OBJECT(proxy), &virtio_pci_config_ops,
 991                           proxy, "virtio-pci", size);
 992     pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
 993                      &proxy->bar);
 994
 995     if (!kvm_has_many_ioeventfds()) {
 996         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
 997     }
 998
 999     proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
1000     proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
1001     proxy->host_features = virtio_bus_get_vdev_features(bus,
1002                                                       proxy->host_features);
1003 }
1004
1005 static void virtio_pci_device_unplugged(DeviceState *d)
1006 {
1007     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1008
1009     virtio_pci_stop_ioeventfd(proxy);
1010 }
1011
1012 static int virtio_pci_init(PCIDevice *pci_dev)
1013 {
1014     VirtIOPCIProxy *dev = VIRTIO_PCI(pci_dev);
1015     VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
1016     virtio_pci_bus_new(&dev->bus, sizeof(dev->bus), dev);
1017     if (k->init != NULL) {
1018         return k->init(dev);
1019     }
1020     return 0;
1021 }
1022
1023 static void virtio_pci_exit(PCIDevice *pci_dev)
1024 {
1025     msix_uninit_exclusive_bar(pci_dev);
1026 }
1027
1028 static void virtio_pci_reset(DeviceState *qdev)
1029 {
1030     VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
1031     VirtioBusState *bus = VIRTIO_BUS(&proxy->bus);
1032     virtio_pci_stop_ioeventfd(proxy);
1033     virtio_bus_reset(bus);
1034     msix_unuse_all_vectors(&proxy->pci_dev);
1035 }
1036
1037 static Property virtio_pci_properties[] = {
1038     DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy, flags,
1039                     VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT, false),
1040     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1041     DEFINE_PROP_END_OF_LIST(),
1042 };
1043
1044 static void virtio_pci_class_init(ObjectClass *klass, void *data)
1045 {
1046     DeviceClass *dc = DEVICE_CLASS(klass);
1047     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1048
1049     dc->props = virtio_pci_properties;
1050     k->init = virtio_pci_init;
1051     k->exit = virtio_pci_exit;
1052     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1053     k->revision = VIRTIO_PCI_ABI_VERSION;
1054     k->class_id = PCI_CLASS_OTHERS;
1055     dc->reset = virtio_pci_reset;
1056 }
1057
1058 static const TypeInfo virtio_pci_info = {
1059     .name          = TYPE_VIRTIO_PCI,
1060     .parent        = TYPE_PCI_DEVICE,
1061     .instance_size = sizeof(VirtIOPCIProxy),
1062     .class_init    = virtio_pci_class_init,
1063     .class_size    = sizeof(VirtioPCIClass),
1064     .abstract      = true,
1065 };
1066
1067 /* virtio-blk-pci */
1068
1069 static Property virtio_blk_pci_properties[] = {
1070     DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
1071     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1072                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1073     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1074     DEFINE_PROP_END_OF_LIST(),
1075 };
1076
1077 static int virtio_blk_pci_init(VirtIOPCIProxy *vpci_dev)
1078 {
1079     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(vpci_dev);
1080     DeviceState *vdev = DEVICE(&dev->vdev);
1081     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1082     if (qdev_init(vdev) < 0) {
1083         return -1;
1084     }
1085     return 0;
1086 }
1087
1088 static void virtio_blk_pci_class_init(ObjectClass *klass, void *data)
1089 {
1090     DeviceClass *dc = DEVICE_CLASS(klass);
1091     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1092     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1093
1094     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1095     dc->props = virtio_blk_pci_properties;
1096     k->init = virtio_blk_pci_init;
1097     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1098     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
1099     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1100     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1101 }
1102
1103 static void virtio_blk_pci_instance_init(Object *obj)
1104 {
1105     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(obj);
1106
1107     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
1108                                 TYPE_VIRTIO_BLK);
1109     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev),"iothread",
1110                               &error_abort);
1111     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
1112                               "bootindex", &error_abort);
1113 }
1114
1115 static const TypeInfo virtio_blk_pci_info = {
1116     .name          = TYPE_VIRTIO_BLK_PCI,
1117     .parent        = TYPE_VIRTIO_PCI,
1118     .instance_size = sizeof(VirtIOBlkPCI),
1119     .instance_init = virtio_blk_pci_instance_init,
1120     .class_init    = virtio_blk_pci_class_init,
1121 };
1122
1123 /* virtio-scsi-pci */
1124
1125 static Property virtio_scsi_pci_properties[] = {
1126     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1127                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1128     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
1129                        DEV_NVECTORS_UNSPECIFIED),
1130     DEFINE_VIRTIO_SCSI_FEATURES(VirtIOPCIProxy, host_features),
1131     DEFINE_PROP_END_OF_LIST(),
1132 };
1133
1134 static int virtio_scsi_pci_init_pci(VirtIOPCIProxy *vpci_dev)
1135 {
1136     VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(vpci_dev);
1137     DeviceState *vdev = DEVICE(&dev->vdev);
1138     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
1139     DeviceState *proxy = DEVICE(vpci_dev);
1140     char *bus_name;
1141
1142     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1143         vpci_dev->nvectors = vs->conf.num_queues + 3;
1144     }
1145
1146     /*
1147      * For command line compatibility, this sets the virtio-scsi-device bus
1148      * name as before.
1149      */
1150     if (proxy->id) {
1151         bus_name = g_strdup_printf("%s.0", proxy->id);
1152         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
1153         g_free(bus_name);
1154     }
1155
1156     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1157     if (qdev_init(vdev) < 0) {
1158         return -1;
1159     }
1160     return 0;
1161 }
1162
1163 static void virtio_scsi_pci_class_init(ObjectClass *klass, void *data)
1164 {
1165     DeviceClass *dc = DEVICE_CLASS(klass);
1166     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1167     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1168     k->init = virtio_scsi_pci_init_pci;
1169     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1170     dc->props = virtio_scsi_pci_properties;
1171     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1172     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1173     pcidev_k->revision = 0x00;
1174     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1175 }
1176
1177 static void virtio_scsi_pci_instance_init(Object *obj)
1178 {
1179     VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(obj);
1180
1181     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
1182                                 TYPE_VIRTIO_SCSI);
1183     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev), "iothread",
1184                               &error_abort);
1185 }
1186
1187 static const TypeInfo virtio_scsi_pci_info = {
1188     .name          = TYPE_VIRTIO_SCSI_PCI,
1189     .parent        = TYPE_VIRTIO_PCI,
1190     .instance_size = sizeof(VirtIOSCSIPCI),
1191     .instance_init = virtio_scsi_pci_instance_init,
1192     .class_init    = virtio_scsi_pci_class_init,
1193 };
1194
1195 /* vhost-scsi-pci */
1196
1197 #ifdef CONFIG_VHOST_SCSI
1198 static Property vhost_scsi_pci_properties[] = {
1199     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
1200                        DEV_NVECTORS_UNSPECIFIED),
1201     DEFINE_PROP_END_OF_LIST(),
1202 };
1203
1204 static int vhost_scsi_pci_init_pci(VirtIOPCIProxy *vpci_dev)
1205 {
1206     VHostSCSIPCI *dev = VHOST_SCSI_PCI(vpci_dev);
1207     DeviceState *vdev = DEVICE(&dev->vdev);
1208     VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
1209
1210     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1211         vpci_dev->nvectors = vs->conf.num_queues + 3;
1212     }
1213
1214     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1215     if (qdev_init(vdev) < 0) {
1216         return -1;
1217     }
1218     return 0;
1219 }
1220
1221 static void vhost_scsi_pci_class_init(ObjectClass *klass, void *data)
1222 {
1223     DeviceClass *dc = DEVICE_CLASS(klass);
1224     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1225     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1226     k->init = vhost_scsi_pci_init_pci;
1227     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
1228     dc->props = vhost_scsi_pci_properties;
1229     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1230     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1231     pcidev_k->revision = 0x00;
1232     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1233 }
1234
1235 static void vhost_scsi_pci_instance_init(Object *obj)
1236 {
1237     VHostSCSIPCI *dev = VHOST_SCSI_PCI(obj);
1238
1239     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
1240                                 TYPE_VHOST_SCSI);
1241 }
1242
1243 static const TypeInfo vhost_scsi_pci_info = {
1244     .name          = TYPE_VHOST_SCSI_PCI,
1245     .parent        = TYPE_VIRTIO_PCI,
1246     .instance_size = sizeof(VHostSCSIPCI),
1247     .instance_init = vhost_scsi_pci_instance_init,
1248     .class_init    = vhost_scsi_pci_class_init,
1249 };
1250 #endif
1251
1252 /* virtio-balloon-pci */
1253
1254 static void balloon_pci_stats_get_all(Object *obj, struct Visitor *v,
1255                                       void *opaque, const char *name,
1256                                       Error **errp)
1257 {
1258     VirtIOBalloonPCI *dev = opaque;
1259     object_property_get(OBJECT(&dev->vdev), v, "guest-stats", errp);
1260 }
1261
1262 static void balloon_pci_stats_get_poll_interval(Object *obj, struct Visitor *v,
1263                                                 void *opaque, const char *name,
1264                                                 Error **errp)
1265 {
1266     VirtIOBalloonPCI *dev = opaque;
1267     object_property_get(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
1268                         errp);
1269 }
1270
1271 static void balloon_pci_stats_set_poll_interval(Object *obj, struct Visitor *v,
1272                                                 void *opaque, const char *name,
1273                                                 Error **errp)
1274 {
1275     VirtIOBalloonPCI *dev = opaque;
1276     object_property_set(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
1277                         errp);
1278 }
1279
1280 static Property virtio_balloon_pci_properties[] = {
1281     DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
1282     DEFINE_PROP_END_OF_LIST(),
1283 };
1284
1285 static int virtio_balloon_pci_init(VirtIOPCIProxy *vpci_dev)
1286 {
1287     VirtIOBalloonPCI *dev = VIRTIO_BALLOON_PCI(vpci_dev);
1288     DeviceState *vdev = DEVICE(&dev->vdev);
1289
1290     if (vpci_dev->class_code != PCI_CLASS_OTHERS &&
1291         vpci_dev->class_code != PCI_CLASS_MEMORY_RAM) { /* qemu < 1.1 */
1292         vpci_dev->class_code = PCI_CLASS_OTHERS;
1293     }
1294
1295     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1296     if (qdev_init(vdev) < 0) {
1297         return -1;
1298     }
1299     return 0;
1300 }
1301
1302 static void virtio_balloon_pci_class_init(ObjectClass *klass, void *data)
1303 {
1304     DeviceClass *dc = DEVICE_CLASS(klass);
1305     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1306     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1307     k->init = virtio_balloon_pci_init;
1308     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
1309     dc->props = virtio_balloon_pci_properties;
1310     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1311     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BALLOON;
1312     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1313     pcidev_k->class_id = PCI_CLASS_OTHERS;
1314 }
1315
1316 static void virtio_balloon_pci_instance_init(Object *obj)
1317 {
1318     VirtIOBalloonPCI *dev = VIRTIO_BALLOON_PCI(obj);
1319     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_BALLOON);
1320     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1321     object_unref(OBJECT(&dev->vdev));
1322     object_property_add(obj, "guest-stats", "guest statistics",
1323                         balloon_pci_stats_get_all, NULL, NULL, dev,
1324                         NULL);
1325
1326     object_property_add(obj, "guest-stats-polling-interval", "int",
1327                         balloon_pci_stats_get_poll_interval,
1328                         balloon_pci_stats_set_poll_interval,
1329                         NULL, dev, NULL);
1330 }
1331
1332 static const TypeInfo virtio_balloon_pci_info = {
1333     .name          = TYPE_VIRTIO_BALLOON_PCI,
1334     .parent        = TYPE_VIRTIO_PCI,
1335     .instance_size = sizeof(VirtIOBalloonPCI),
1336     .instance_init = virtio_balloon_pci_instance_init,
1337     .class_init    = virtio_balloon_pci_class_init,
1338 };
1339
1340 /* virtio-serial-pci */
1341
1342 static int virtio_serial_pci_init(VirtIOPCIProxy *vpci_dev)
1343 {
1344     VirtIOSerialPCI *dev = VIRTIO_SERIAL_PCI(vpci_dev);
1345     DeviceState *vdev = DEVICE(&dev->vdev);
1346     DeviceState *proxy = DEVICE(vpci_dev);
1347     char *bus_name;
1348
1349     if (vpci_dev->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
1350         vpci_dev->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
1351         vpci_dev->class_code != PCI_CLASS_OTHERS) {        /* qemu-kvm  */
1352             vpci_dev->class_code = PCI_CLASS_COMMUNICATION_OTHER;
1353     }
1354
1355     /* backwards-compatibility with machines that were created with
1356        DEV_NVECTORS_UNSPECIFIED */
1357     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1358         vpci_dev->nvectors = dev->vdev.serial.max_virtserial_ports + 1;
1359     }
1360
1361     /*
1362      * For command line compatibility, this sets the virtio-serial-device bus
1363      * name as before.
1364      */
1365     if (proxy->id) {
1366         bus_name = g_strdup_printf("%s.0", proxy->id);
1367         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
1368         g_free(bus_name);
1369     }
1370
1371     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1372     if (qdev_init(vdev) < 0) {
1373         return -1;
1374     }
1375     return 0;
1376 }
1377
1378 static Property virtio_serial_pci_properties[] = {
1379     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1380                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1381     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1382     DEFINE_PROP_UINT32("class", VirtIOPCIProxy, class_code, 0),
1383     DEFINE_PROP_END_OF_LIST(),
1384 };
1385
1386 static void virtio_serial_pci_class_init(ObjectClass *klass, void *data)
1387 {
1388     DeviceClass *dc = DEVICE_CLASS(klass);
1389     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1390     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1391     k->init = virtio_serial_pci_init;
1392     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
1393     dc->props = virtio_serial_pci_properties;
1394     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1395     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_CONSOLE;
1396     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1397     pcidev_k->class_id = PCI_CLASS_COMMUNICATION_OTHER;
1398 }
1399
1400 static void virtio_serial_pci_instance_init(Object *obj)
1401 {
1402     VirtIOSerialPCI *dev = VIRTIO_SERIAL_PCI(obj);
1403
1404     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
1405                                 TYPE_VIRTIO_SERIAL);
1406 }
1407
1408 static const TypeInfo virtio_serial_pci_info = {
1409     .name          = TYPE_VIRTIO_SERIAL_PCI,
1410     .parent        = TYPE_VIRTIO_PCI,
1411     .instance_size = sizeof(VirtIOSerialPCI),
1412     .instance_init = virtio_serial_pci_instance_init,
1413     .class_init    = virtio_serial_pci_class_init,
1414 };
1415
1416 /* virtio-net-pci */
1417
1418 static Property virtio_net_properties[] = {
1419     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1420                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
1421     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
1422     DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features),
1423     DEFINE_PROP_END_OF_LIST(),
1424 };
1425
1426 static int virtio_net_pci_init(VirtIOPCIProxy *vpci_dev)
1427 {
1428     DeviceState *qdev = DEVICE(vpci_dev);
1429     VirtIONetPCI *dev = VIRTIO_NET_PCI(vpci_dev);
1430     DeviceState *vdev = DEVICE(&dev->vdev);
1431
1432     virtio_net_set_config_size(&dev->vdev, vpci_dev->host_features);
1433     virtio_net_set_netclient_name(&dev->vdev, qdev->id,
1434                                   object_get_typename(OBJECT(qdev)));
1435     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1436     if (qdev_init(vdev) < 0) {
1437         return -1;
1438     }
1439     return 0;
1440 }
1441
1442 static void virtio_net_pci_class_init(ObjectClass *klass, void *data)
1443 {
1444     DeviceClass *dc = DEVICE_CLASS(klass);
1445     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1446     VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass);
1447
1448     k->romfile = "efi-virtio.rom";
1449     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1450     k->device_id = PCI_DEVICE_ID_VIRTIO_NET;
1451     k->revision = VIRTIO_PCI_ABI_VERSION;
1452     k->class_id = PCI_CLASS_NETWORK_ETHERNET;
1453     set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
1454     dc->props = virtio_net_properties;
1455     vpciklass->init = virtio_net_pci_init;
1456 }
1457
1458 static void virtio_net_pci_instance_init(Object *obj)
1459 {
1460     VirtIONetPCI *dev = VIRTIO_NET_PCI(obj);
1461
1462     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
1463                                 TYPE_VIRTIO_NET);
1464     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
1465                               "bootindex", &error_abort);
1466 }
1467
1468 static const TypeInfo virtio_net_pci_info = {
1469     .name          = TYPE_VIRTIO_NET_PCI,
1470     .parent        = TYPE_VIRTIO_PCI,
1471     .instance_size = sizeof(VirtIONetPCI),
1472     .instance_init = virtio_net_pci_instance_init,
1473     .class_init    = virtio_net_pci_class_init,
1474 };
1475
1476 /* virtio-rng-pci */
1477
1478 static Property virtio_rng_pci_properties[] = {
1479     DEFINE_PROP_END_OF_LIST(),
1480 };
1481
1482 static int virtio_rng_pci_init(VirtIOPCIProxy *vpci_dev)
1483 {
1484     VirtIORngPCI *vrng = VIRTIO_RNG_PCI(vpci_dev);
1485     DeviceState *vdev = DEVICE(&vrng->vdev);
1486
1487     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1488     if (qdev_init(vdev) < 0) {
1489         return -1;
1490     }
1491
1492     object_property_set_link(OBJECT(vrng),
1493                              OBJECT(vrng->vdev.conf.rng), "rng",
1494                              NULL);
1495
1496     return 0;
1497 }
1498
1499 static void virtio_rng_pci_class_init(ObjectClass *klass, void *data)
1500 {
1501     DeviceClass *dc = DEVICE_CLASS(klass);
1502     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1503     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1504
1505     k->init = virtio_rng_pci_init;
1506     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
1507     dc->props = virtio_rng_pci_properties;
1508
1509     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1510     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_RNG;
1511     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1512     pcidev_k->class_id = PCI_CLASS_OTHERS;
1513 }
1514
1515 static void virtio_rng_initfn(Object *obj)
1516 {
1517     VirtIORngPCI *dev = VIRTIO_RNG_PCI(obj);
1518
1519     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
1520                                 TYPE_VIRTIO_RNG);
1521     object_property_add_alias(obj, "rng", OBJECT(&dev->vdev), "rng",
1522                               &error_abort);
1523 }
1524
1525 static const TypeInfo virtio_rng_pci_info = {
1526     .name          = TYPE_VIRTIO_RNG_PCI,
1527     .parent        = TYPE_VIRTIO_PCI,
1528     .instance_size = sizeof(VirtIORngPCI),
1529     .instance_init = virtio_rng_initfn,
1530     .class_init    = virtio_rng_pci_class_init,
1531 };
1532
1533 /* virtio-pci-bus */
1534
1535 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size,
1536                                VirtIOPCIProxy *dev)
1537 {
1538     DeviceState *qdev = DEVICE(dev);
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 }
1544
1545 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
1546 {
1547     BusClass *bus_class = BUS_CLASS(klass);
1548     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
1549     bus_class->max_dev = 1;
1550     k->notify = virtio_pci_notify;
1551     k->save_config = virtio_pci_save_config;
1552     k->load_config = virtio_pci_load_config;
1553     k->save_queue = virtio_pci_save_queue;
1554     k->load_queue = virtio_pci_load_queue;
1555     k->get_features = virtio_pci_get_features;
1556     k->query_guest_notifiers = virtio_pci_query_guest_notifiers;
1557     k->set_host_notifier = virtio_pci_set_host_notifier;
1558     k->set_guest_notifiers = virtio_pci_set_guest_notifiers;
1559     k->vmstate_change = virtio_pci_vmstate_change;
1560     k->device_plugged = virtio_pci_device_plugged;
1561     k->device_unplugged = virtio_pci_device_unplugged;
1562 }
1563
1564 static const TypeInfo virtio_pci_bus_info = {
1565     .name          = TYPE_VIRTIO_PCI_BUS,
1566     .parent        = TYPE_VIRTIO_BUS,
1567     .instance_size = sizeof(VirtioPCIBusState),
1568     .class_init    = virtio_pci_bus_class_init,
1569 };
1570
1571 static void virtio_pci_register_types(void)
1572 {
1573     type_register_static(&virtio_rng_pci_info);
1574     type_register_static(&virtio_pci_bus_info);
1575     type_register_static(&virtio_pci_info);
1576 #ifdef CONFIG_VIRTFS
1577     type_register_static(&virtio_9p_pci_info);
1578 #endif
1579     type_register_static(&virtio_blk_pci_info);
1580     type_register_static(&virtio_scsi_pci_info);
1581     type_register_static(&virtio_balloon_pci_info);
1582     type_register_static(&virtio_serial_pci_info);
1583     type_register_static(&virtio_net_pci_info);
1584 #ifdef CONFIG_VHOST_SCSI
1585     type_register_static(&vhost_scsi_pci_info);
1586 #endif
1587 }
1588
1589 type_init(virtio_pci_register_types)