hw/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.h"
  21 #include "hw/virtio-blk.h"
  22 #include "hw/virtio-net.h"
  23 #include "hw/virtio-serial.h"
  24 #include "hw/virtio-scsi.h"
  25 #include "hw/pci/pci.h"
  26 #include "qemu/error-report.h"
  27 #include "hw/pci/msi.h"
  28 #include "hw/pci/msix.h"
  29 #include "hw/loader.h"
  30 #include "sysemu/kvm.h"
  31 #include "sysemu/blockdev.h"
  32 #include "hw/virtio-pci.h"
  33 #include "qemu/range.h"
  34 #include "hw/virtio-bus.h"
  35
  36 /* from Linux's linux/virtio_pci.h */
  37
  38 /* A 32-bit r/o bitmask of the features supported by the host */
  39 #define VIRTIO_PCI_HOST_FEATURES        0
  40
  41 /* A 32-bit r/w bitmask of features activated by the guest */
  42 #define VIRTIO_PCI_GUEST_FEATURES       4
  43
  44 /* A 32-bit r/w PFN for the currently selected queue */
  45 #define VIRTIO_PCI_QUEUE_PFN            8
  46
  47 /* A 16-bit r/o queue size for the currently selected queue */
  48 #define VIRTIO_PCI_QUEUE_NUM            12
  49
  50 /* A 16-bit r/w queue selector */
  51 #define VIRTIO_PCI_QUEUE_SEL            14
  52
  53 /* A 16-bit r/w queue notifier */
  54 #define VIRTIO_PCI_QUEUE_NOTIFY         16
  55
  56 /* An 8-bit device status register.  */
  57 #define VIRTIO_PCI_STATUS               18
  58
  59 /* An 8-bit r/o interrupt status register.  Reading the value will return the
  60  * current contents of the ISR and will also clear it.  This is effectively
  61  * a read-and-acknowledge. */
  62 #define VIRTIO_PCI_ISR                  19
  63
  64 /* MSI-X registers: only enabled if MSI-X is enabled. */
  65 /* A 16-bit vector for configuration changes. */
  66 #define VIRTIO_MSI_CONFIG_VECTOR        20
  67 /* A 16-bit vector for selected queue notifications. */
  68 #define VIRTIO_MSI_QUEUE_VECTOR         22
  69
  70 /* Config space size */
  71 #define VIRTIO_PCI_CONFIG_NOMSI         20
  72 #define VIRTIO_PCI_CONFIG_MSI           24
  73 #define VIRTIO_PCI_REGION_SIZE(dev)     (msix_present(dev) ? \
  74                                          VIRTIO_PCI_CONFIG_MSI : \
  75                                          VIRTIO_PCI_CONFIG_NOMSI)
  76
  77 /* The remaining space is defined by each driver as the per-driver
  78  * configuration space */
  79 #define VIRTIO_PCI_CONFIG(dev)          (msix_enabled(dev) ? \
  80                                          VIRTIO_PCI_CONFIG_MSI : \
  81                                          VIRTIO_PCI_CONFIG_NOMSI)
  82
  83 /* How many bits to shift physical queue address written to QUEUE_PFN.
  84  * 12 is historical, and due to x86 page size. */
  85 #define VIRTIO_PCI_QUEUE_ADDR_SHIFT    12
  86
  87 /* Flags track per-device state like workarounds for quirks in older guests. */
  88 #define VIRTIO_PCI_FLAG_BUS_MASTER_BUG  (1 << 0)
  89
  90 /* QEMU doesn't strictly need write barriers since everything runs in
  91  * lock-step.  We'll leave the calls to wmb() in though to make it obvious for
  92  * KVM or if kqemu gets SMP support.
  93  */
  94 #define wmb() do { } while (0)
  95
  96 /* HACK for virtio to determine if it's running a big endian guest */
  97 bool virtio_is_big_endian(void);
  98
  99 /* virtio device */
 100 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */
 101 static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d)
 102 {
 103     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 104 }
 105
 106 /* DeviceState to VirtIOPCIProxy. Note: used on datapath,
 107  * be careful and test performance if you change this.
 108  */
 109 static inline VirtIOPCIProxy *to_virtio_pci_proxy_fast(DeviceState *d)
 110 {
 111     return container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 112 }
 113
 114 static void virtio_pci_notify(DeviceState *d, uint16_t vector)
 115 {
 116     VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(d);
 117     if (msix_enabled(&proxy->pci_dev))
 118         msix_notify(&proxy->pci_dev, vector);
 119     else
 120         qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
 121 }
 122
 123 static void virtio_pci_save_config(DeviceState *d, QEMUFile *f)
 124 {
 125     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 126     pci_device_save(&proxy->pci_dev, f);
 127     msix_save(&proxy->pci_dev, f);
 128     if (msix_present(&proxy->pci_dev))
 129         qemu_put_be16(f, proxy->vdev->config_vector);
 130 }
 131
 132 static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f)
 133 {
 134     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 135     if (msix_present(&proxy->pci_dev))
 136         qemu_put_be16(f, virtio_queue_vector(proxy->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     int ret;
 143     ret = pci_device_load(&proxy->pci_dev, f);
 144     if (ret) {
 145         return ret;
 146     }
 147     msix_unuse_all_vectors(&proxy->pci_dev);
 148     msix_load(&proxy->pci_dev, f);
 149     if (msix_present(&proxy->pci_dev)) {
 150         qemu_get_be16s(f, &proxy->vdev->config_vector);
 151     } else {
 152         proxy->vdev->config_vector = VIRTIO_NO_VECTOR;
 153     }
 154     if (proxy->vdev->config_vector != VIRTIO_NO_VECTOR) {
 155         return msix_vector_use(&proxy->pci_dev, proxy->vdev->config_vector);
 156     }
 157     return 0;
 158 }
 159
 160 static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f)
 161 {
 162     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 163     uint16_t vector;
 164     if (msix_present(&proxy->pci_dev)) {
 165         qemu_get_be16s(f, &vector);
 166     } else {
 167         vector = VIRTIO_NO_VECTOR;
 168     }
 169     virtio_queue_set_vector(proxy->vdev, n, vector);
 170     if (vector != VIRTIO_NO_VECTOR) {
 171         return msix_vector_use(&proxy->pci_dev, vector);
 172     }
 173     return 0;
 174 }
 175
 176 static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy,
 177                                                  int n, bool assign, bool set_handler)
 178 {
 179     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 180     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
 181     int r = 0;
 182
 183     if (assign) {
 184         r = event_notifier_init(notifier, 1);
 185         if (r < 0) {
 186             error_report("%s: unable to init event notifier: %d",
 187                          __func__, r);
 188             return r;
 189         }
 190         virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
 191         memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 192                                   true, n, notifier);
 193     } else {
 194         memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 195                                   true, n, notifier);
 196         virtio_queue_set_host_notifier_fd_handler(vq, false, false);
 197         event_notifier_cleanup(notifier);
 198     }
 199     return r;
 200 }
 201
 202 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
 203 {
 204     int n, r;
 205
 206     if (!(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) ||
 207         proxy->ioeventfd_disabled ||
 208         proxy->ioeventfd_started) {
 209         return;
 210     }
 211
 212     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 213         if (!virtio_queue_get_num(proxy->vdev, n)) {
 214             continue;
 215         }
 216
 217         r = virtio_pci_set_host_notifier_internal(proxy, n, true, true);
 218         if (r < 0) {
 219             goto assign_error;
 220         }
 221     }
 222     proxy->ioeventfd_started = true;
 223     return;
 224
 225 assign_error:
 226     while (--n >= 0) {
 227         if (!virtio_queue_get_num(proxy->vdev, n)) {
 228             continue;
 229         }
 230
 231         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 232         assert(r >= 0);
 233     }
 234     proxy->ioeventfd_started = false;
 235     error_report("%s: failed. Fallback to a userspace (slower).", __func__);
 236 }
 237
 238 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
 239 {
 240     int r;
 241     int n;
 242
 243     if (!proxy->ioeventfd_started) {
 244         return;
 245     }
 246
 247     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 248         if (!virtio_queue_get_num(proxy->vdev, n)) {
 249             continue;
 250         }
 251
 252         r = virtio_pci_set_host_notifier_internal(proxy, n, false, false);
 253         assert(r >= 0);
 254     }
 255     proxy->ioeventfd_started = false;
 256 }
 257
 258 static void virtio_pci_reset(DeviceState *d)
 259 {
 260     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 261     virtio_pci_stop_ioeventfd(proxy);
 262     virtio_reset(proxy->vdev);
 263     msix_unuse_all_vectors(&proxy->pci_dev);
 264     proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 265 }
 266
 267 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 268 {
 269     VirtIOPCIProxy *proxy = opaque;
 270     VirtIODevice *vdev = proxy->vdev;
 271     hwaddr pa;
 272
 273     switch (addr) {
 274     case VIRTIO_PCI_GUEST_FEATURES:
 275         /* Guest does not negotiate properly?  We have to assume nothing. */
 276         if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
 277             val = vdev->bad_features ? vdev->bad_features(vdev) : 0;
 278         }
 279         virtio_set_features(vdev, val);
 280         break;
 281     case VIRTIO_PCI_QUEUE_PFN:
 282         pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 283         if (pa == 0) {
 284             virtio_pci_stop_ioeventfd(proxy);
 285             virtio_reset(proxy->vdev);
 286             msix_unuse_all_vectors(&proxy->pci_dev);
 287         }
 288         else
 289             virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
 290         break;
 291     case VIRTIO_PCI_QUEUE_SEL:
 292         if (val < VIRTIO_PCI_QUEUE_MAX)
 293             vdev->queue_sel = val;
 294         break;
 295     case VIRTIO_PCI_QUEUE_NOTIFY:
 296         if (val < VIRTIO_PCI_QUEUE_MAX) {
 297             virtio_queue_notify(vdev, val);
 298         }
 299         break;
 300     case VIRTIO_PCI_STATUS:
 301         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
 302             virtio_pci_stop_ioeventfd(proxy);
 303         }
 304
 305         virtio_set_status(vdev, val & 0xFF);
 306
 307         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
 308             virtio_pci_start_ioeventfd(proxy);
 309         }
 310
 311         if (vdev->status == 0) {
 312             virtio_reset(proxy->vdev);
 313             msix_unuse_all_vectors(&proxy->pci_dev);
 314         }
 315
 316         /* Linux before 2.6.34 sets the device as OK without enabling
 317            the PCI device bus master bit. In this case we need to disable
 318            some safety checks. */
 319         if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
 320             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 321             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 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 = proxy->vdev;
 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         qemu_set_irq(proxy->pci_dev.irq[0], 0);
 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     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 395     uint64_t val = 0;
 396     if (addr < config) {
 397         return virtio_ioport_read(proxy, addr);
 398     }
 399     addr -= config;
 400
 401     switch (size) {
 402     case 1:
 403         val = virtio_config_readb(proxy->vdev, addr);
 404         break;
 405     case 2:
 406         val = virtio_config_readw(proxy->vdev, addr);
 407         if (virtio_is_big_endian()) {
 408             val = bswap16(val);
 409         }
 410         break;
 411     case 4:
 412         val = virtio_config_readl(proxy->vdev, addr);
 413         if (virtio_is_big_endian()) {
 414             val = bswap32(val);
 415         }
 416         break;
 417     }
 418     return val;
 419 }
 420
 421 static void virtio_pci_config_write(void *opaque, hwaddr addr,
 422                                     uint64_t val, unsigned size)
 423 {
 424     VirtIOPCIProxy *proxy = opaque;
 425     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 426     if (addr < config) {
 427         virtio_ioport_write(proxy, addr, val);
 428         return;
 429     }
 430     addr -= config;
 431     /*
 432      * Virtio-PCI is odd. Ioports are LE but config space is target native
 433      * endian.
 434      */
 435     switch (size) {
 436     case 1:
 437         virtio_config_writeb(proxy->vdev, addr, val);
 438         break;
 439     case 2:
 440         if (virtio_is_big_endian()) {
 441             val = bswap16(val);
 442         }
 443         virtio_config_writew(proxy->vdev, addr, val);
 444         break;
 445     case 4:
 446         if (virtio_is_big_endian()) {
 447             val = bswap32(val);
 448         }
 449         virtio_config_writel(proxy->vdev, addr, val);
 450         break;
 451     }
 452 }
 453
 454 static const MemoryRegionOps virtio_pci_config_ops = {
 455     .read = virtio_pci_config_read,
 456     .write = virtio_pci_config_write,
 457     .impl = {
 458         .min_access_size = 1,
 459         .max_access_size = 4,
 460     },
 461     .endianness = DEVICE_LITTLE_ENDIAN,
 462 };
 463
 464 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 465                                 uint32_t val, int len)
 466 {
 467     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 468
 469     pci_default_write_config(pci_dev, address, val, len);
 470
 471     if (range_covers_byte(address, len, PCI_COMMAND) &&
 472         !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER) &&
 473         !(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
 474         virtio_pci_stop_ioeventfd(proxy);
 475         virtio_set_status(proxy->vdev,
 476                           proxy->vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
 477     }
 478 }
 479
 480 static unsigned virtio_pci_get_features(DeviceState *d)
 481 {
 482     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 483     return proxy->host_features;
 484 }
 485
 486 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy,
 487                                         unsigned int queue_no,
 488                                         unsigned int vector,
 489                                         MSIMessage msg)
 490 {
 491     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 492     int ret;
 493
 494     if (irqfd->users == 0) {
 495         ret = kvm_irqchip_add_msi_route(kvm_state, msg);
 496         if (ret < 0) {
 497             return ret;
 498         }
 499         irqfd->virq = ret;
 500     }
 501     irqfd->users++;
 502     return 0;
 503 }
 504
 505 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy,
 506                                              unsigned int vector)
 507 {
 508     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 509     if (--irqfd->users == 0) {
 510         kvm_irqchip_release_virq(kvm_state, irqfd->virq);
 511     }
 512 }
 513
 514 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy,
 515                                  unsigned int queue_no,
 516                                  unsigned int vector)
 517 {
 518     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 519     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 520     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 521     int ret;
 522     ret = kvm_irqchip_add_irqfd_notifier(kvm_state, n, irqfd->virq);
 523     return ret;
 524 }
 525
 526 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy,
 527                                       unsigned int queue_no,
 528                                       unsigned int vector)
 529 {
 530     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 531     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 532     VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector];
 533     int ret;
 534
 535     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, n, irqfd->virq);
 536     assert(ret == 0);
 537 }
 538
 539 static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs)
 540 {
 541     PCIDevice *dev = &proxy->pci_dev;
 542     VirtIODevice *vdev = proxy->vdev;
 543     unsigned int vector;
 544     int ret, queue_no;
 545     MSIMessage msg;
 546
 547     for (queue_no = 0; queue_no < nvqs; queue_no++) {
 548         if (!virtio_queue_get_num(vdev, queue_no)) {
 549             break;
 550         }
 551         vector = virtio_queue_vector(vdev, queue_no);
 552         if (vector >= msix_nr_vectors_allocated(dev)) {
 553             continue;
 554         }
 555         msg = msix_get_message(dev, vector);
 556         ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector, msg);
 557         if (ret < 0) {
 558             goto undo;
 559         }
 560         /* If guest supports masking, set up irqfd now.
 561          * Otherwise, delay until unmasked in the frontend.
 562          */
 563         if (proxy->vdev->guest_notifier_mask) {
 564             ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
 565             if (ret < 0) {
 566                 kvm_virtio_pci_vq_vector_release(proxy, vector);
 567                 goto undo;
 568             }
 569         }
 570     }
 571     return 0;
 572
 573 undo:
 574     while (--queue_no >= 0) {
 575         vector = virtio_queue_vector(vdev, queue_no);
 576         if (vector >= msix_nr_vectors_allocated(dev)) {
 577             continue;
 578         }
 579         if (proxy->vdev->guest_notifier_mask) {
 580             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 581         }
 582         kvm_virtio_pci_vq_vector_release(proxy, vector);
 583     }
 584     return ret;
 585 }
 586
 587 static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs)
 588 {
 589     PCIDevice *dev = &proxy->pci_dev;
 590     VirtIODevice *vdev = proxy->vdev;
 591     unsigned int vector;
 592     int queue_no;
 593
 594     for (queue_no = 0; queue_no < nvqs; queue_no++) {
 595         if (!virtio_queue_get_num(vdev, queue_no)) {
 596             break;
 597         }
 598         vector = virtio_queue_vector(vdev, queue_no);
 599         if (vector >= msix_nr_vectors_allocated(dev)) {
 600             continue;
 601         }
 602         /* If guest supports masking, clean up irqfd now.
 603          * Otherwise, it was cleaned when masked in the frontend.
 604          */
 605         if (proxy->vdev->guest_notifier_mask) {
 606             kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 607         }
 608         kvm_virtio_pci_vq_vector_release(proxy, vector);
 609     }
 610 }
 611
 612 static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy,
 613                                        unsigned int queue_no,
 614                                        unsigned int vector,
 615                                        MSIMessage msg)
 616 {
 617     VirtQueue *vq = virtio_get_queue(proxy->vdev, queue_no);
 618     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 619     VirtIOIRQFD *irqfd;
 620     int ret = 0;
 621
 622     if (proxy->vector_irqfd) {
 623         irqfd = &proxy->vector_irqfd[vector];
 624         if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) {
 625             ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg);
 626             if (ret < 0) {
 627                 return ret;
 628             }
 629         }
 630     }
 631
 632     /* If guest supports masking, irqfd is already setup, unmask it.
 633      * Otherwise, set it up now.
 634      */
 635     if (proxy->vdev->guest_notifier_mask) {
 636         proxy->vdev->guest_notifier_mask(proxy->vdev, queue_no, false);
 637         /* Test after unmasking to avoid losing events. */
 638         if (proxy->vdev->guest_notifier_pending &&
 639             proxy->vdev->guest_notifier_pending(proxy->vdev, queue_no)) {
 640             event_notifier_set(n);
 641         }
 642     } else {
 643         ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector);
 644     }
 645     return ret;
 646 }
 647
 648 static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy,
 649                                              unsigned int queue_no,
 650                                              unsigned int vector)
 651 {
 652     /* If guest supports masking, keep irqfd but mask it.
 653      * Otherwise, clean it up now.
 654      */
 655     if (proxy->vdev->guest_notifier_mask) {
 656         proxy->vdev->guest_notifier_mask(proxy->vdev, queue_no, true);
 657     } else {
 658         kvm_virtio_pci_irqfd_release(proxy, queue_no, vector);
 659     }
 660 }
 661
 662 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector,
 663                                     MSIMessage msg)
 664 {
 665     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 666     VirtIODevice *vdev = proxy->vdev;
 667     int ret, queue_no;
 668
 669     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 670         if (!virtio_queue_get_num(vdev, queue_no)) {
 671             break;
 672         }
 673         if (virtio_queue_vector(vdev, queue_no) != vector) {
 674             continue;
 675         }
 676         ret = virtio_pci_vq_vector_unmask(proxy, queue_no, vector, msg);
 677         if (ret < 0) {
 678             goto undo;
 679         }
 680     }
 681     return 0;
 682
 683 undo:
 684     while (--queue_no >= 0) {
 685         if (virtio_queue_vector(vdev, queue_no) != vector) {
 686             continue;
 687         }
 688         virtio_pci_vq_vector_mask(proxy, queue_no, vector);
 689     }
 690     return ret;
 691 }
 692
 693 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector)
 694 {
 695     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 696     VirtIODevice *vdev = proxy->vdev;
 697     int queue_no;
 698
 699     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 700         if (!virtio_queue_get_num(vdev, queue_no)) {
 701             break;
 702         }
 703         if (virtio_queue_vector(vdev, queue_no) != vector) {
 704             continue;
 705         }
 706         virtio_pci_vq_vector_mask(proxy, queue_no, vector);
 707     }
 708 }
 709
 710 static void virtio_pci_vector_poll(PCIDevice *dev,
 711                                    unsigned int vector_start,
 712                                    unsigned int vector_end)
 713 {
 714     VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev);
 715     VirtIODevice *vdev = proxy->vdev;
 716     int queue_no;
 717     unsigned int vector;
 718     EventNotifier *notifier;
 719     VirtQueue *vq;
 720
 721     for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) {
 722         if (!virtio_queue_get_num(vdev, queue_no)) {
 723             break;
 724         }
 725         vector = virtio_queue_vector(vdev, queue_no);
 726         if (vector < vector_start || vector >= vector_end ||
 727             !msix_is_masked(dev, vector)) {
 728             continue;
 729         }
 730         vq = virtio_get_queue(vdev, queue_no);
 731         notifier = virtio_queue_get_guest_notifier(vq);
 732         if (vdev->guest_notifier_pending) {
 733             if (vdev->guest_notifier_pending(vdev, queue_no)) {
 734                 msix_set_pending(dev, vector);
 735             }
 736         } else if (event_notifier_test_and_clear(notifier)) {
 737             msix_set_pending(dev, vector);
 738         }
 739     }
 740 }
 741
 742 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign,
 743                                          bool with_irqfd)
 744 {
 745     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 746     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 747     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 748
 749     if (assign) {
 750         int r = event_notifier_init(notifier, 0);
 751         if (r < 0) {
 752             return r;
 753         }
 754         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
 755     } else {
 756         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
 757         event_notifier_cleanup(notifier);
 758     }
 759
 760     return 0;
 761 }
 762
 763 static bool virtio_pci_query_guest_notifiers(DeviceState *d)
 764 {
 765     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 766     return msix_enabled(&proxy->pci_dev);
 767 }
 768
 769 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign)
 770 {
 771     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 772     VirtIODevice *vdev = proxy->vdev;
 773     int r, n;
 774     bool with_irqfd = msix_enabled(&proxy->pci_dev) &&
 775         kvm_msi_via_irqfd_enabled();
 776
 777     nvqs = MIN(nvqs, VIRTIO_PCI_QUEUE_MAX);
 778
 779     /* When deassigning, pass a consistent nvqs value
 780      * to avoid leaking notifiers.
 781      */
 782     assert(assign || nvqs == proxy->nvqs_with_notifiers);
 783
 784     proxy->nvqs_with_notifiers = nvqs;
 785
 786     /* Must unset vector notifier while guest notifier is still assigned */
 787     if ((proxy->vector_irqfd || vdev->guest_notifier_mask) && !assign) {
 788         msix_unset_vector_notifiers(&proxy->pci_dev);
 789         if (proxy->vector_irqfd) {
 790             kvm_virtio_pci_vector_release(proxy, nvqs);
 791             g_free(proxy->vector_irqfd);
 792             proxy->vector_irqfd = NULL;
 793         }
 794     }
 795
 796     for (n = 0; n < nvqs; n++) {
 797         if (!virtio_queue_get_num(vdev, n)) {
 798             break;
 799         }
 800
 801         r = virtio_pci_set_guest_notifier(d, n, assign,
 802                                           kvm_msi_via_irqfd_enabled());
 803         if (r < 0) {
 804             goto assign_error;
 805         }
 806     }
 807
 808     /* Must set vector notifier after guest notifier has been assigned */
 809     if ((with_irqfd || vdev->guest_notifier_mask) && assign) {
 810         if (with_irqfd) {
 811             proxy->vector_irqfd =
 812                 g_malloc0(sizeof(*proxy->vector_irqfd) *
 813                           msix_nr_vectors_allocated(&proxy->pci_dev));
 814             r = kvm_virtio_pci_vector_use(proxy, nvqs);
 815             if (r < 0) {
 816                 goto assign_error;
 817             }
 818         }
 819         r = msix_set_vector_notifiers(&proxy->pci_dev,
 820                                       virtio_pci_vector_unmask,
 821                                       virtio_pci_vector_mask,
 822                                       virtio_pci_vector_poll);
 823         if (r < 0) {
 824             goto notifiers_error;
 825         }
 826     }
 827
 828     return 0;
 829
 830 notifiers_error:
 831     if (with_irqfd) {
 832         assert(assign);
 833         kvm_virtio_pci_vector_release(proxy, nvqs);
 834     }
 835
 836 assign_error:
 837     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
 838     assert(assign);
 839     while (--n >= 0) {
 840         virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd);
 841     }
 842     return r;
 843 }
 844
 845 static int virtio_pci_set_host_notifier(DeviceState *d, int n, bool assign)
 846 {
 847     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 848
 849     /* Stop using ioeventfd for virtqueue kick if the device starts using host
 850      * notifiers.  This makes it easy to avoid stepping on each others' toes.
 851      */
 852     proxy->ioeventfd_disabled = assign;
 853     if (assign) {
 854         virtio_pci_stop_ioeventfd(proxy);
 855     }
 856     /* We don't need to start here: it's not needed because backend
 857      * currently only stops on status change away from ok,
 858      * reset, vmstop and such. If we do add code to start here,
 859      * need to check vmstate, device state etc. */
 860     return virtio_pci_set_host_notifier_internal(proxy, n, assign, false);
 861 }
 862
 863 static void virtio_pci_vmstate_change(DeviceState *d, bool running)
 864 {
 865     VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d);
 866
 867     if (running) {
 868         /* Try to find out if the guest has bus master disabled, but is
 869            in ready state. Then we have a buggy guest OS. */
 870         if ((proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
 871             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 872             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 873         }
 874         virtio_pci_start_ioeventfd(proxy);
 875     } else {
 876         virtio_pci_stop_ioeventfd(proxy);
 877     }
 878 }
 879
 880 static const VirtIOBindings virtio_pci_bindings = {
 881     .notify = virtio_pci_notify,
 882     .save_config = virtio_pci_save_config,
 883     .load_config = virtio_pci_load_config,
 884     .save_queue = virtio_pci_save_queue,
 885     .load_queue = virtio_pci_load_queue,
 886     .get_features = virtio_pci_get_features,
 887     .query_guest_notifiers = virtio_pci_query_guest_notifiers,
 888     .set_host_notifier = virtio_pci_set_host_notifier,
 889     .set_guest_notifiers = virtio_pci_set_guest_notifiers,
 890     .vmstate_change = virtio_pci_vmstate_change,
 891 };
 892
 893 void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev)
 894 {
 895     uint8_t *config;
 896     uint32_t size;
 897
 898     proxy->vdev = vdev;
 899
 900     config = proxy->pci_dev.config;
 901
 902     if (proxy->class_code) {
 903         pci_config_set_class(config, proxy->class_code);
 904     }
 905     pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
 906                  pci_get_word(config + PCI_VENDOR_ID));
 907     pci_set_word(config + PCI_SUBSYSTEM_ID, vdev->device_id);
 908     config[PCI_INTERRUPT_PIN] = 1;
 909
 910     if (vdev->nvectors &&
 911         msix_init_exclusive_bar(&proxy->pci_dev, vdev->nvectors, 1)) {
 912         vdev->nvectors = 0;
 913     }
 914
 915     proxy->pci_dev.config_write = virtio_write_config;
 916
 917     size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len;
 918     if (size & (size-1))
 919         size = 1 << qemu_fls(size);
 920
 921     memory_region_init_io(&proxy->bar, &virtio_pci_config_ops, proxy,
 922                           "virtio-pci", size);
 923     pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
 924                      &proxy->bar);
 925
 926     if (!kvm_has_many_ioeventfds()) {
 927         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
 928     }
 929
 930     virtio_bind_device(vdev, &virtio_pci_bindings, DEVICE(proxy));
 931     proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
 932     proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
 933     proxy->host_features = vdev->get_features(vdev, proxy->host_features);
 934 }
 935
 936 static void virtio_exit_pci(PCIDevice *pci_dev)
 937 {
 938     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 939
 940     memory_region_destroy(&proxy->bar);
 941     msix_uninit_exclusive_bar(pci_dev);
 942 }
 943
 944 static int virtio_serial_init_pci(PCIDevice *pci_dev)
 945 {
 946     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 947     VirtIODevice *vdev;
 948
 949     if (proxy->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
 950         proxy->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
 951         proxy->class_code != PCI_CLASS_OTHERS)          /* qemu-kvm  */
 952         proxy->class_code = PCI_CLASS_COMMUNICATION_OTHER;
 953
 954     vdev = virtio_serial_init(&pci_dev->qdev, &proxy->serial);
 955     if (!vdev) {
 956         return -1;
 957     }
 958
 959     /* backwards-compatibility with machines that were created with
 960        DEV_NVECTORS_UNSPECIFIED */
 961     vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED
 962                                         ? proxy->serial.max_virtserial_ports + 1
 963                                         : proxy->nvectors;
 964     virtio_init_pci(proxy, vdev);
 965     proxy->nvectors = vdev->nvectors;
 966     return 0;
 967 }
 968
 969 static void virtio_serial_exit_pci(PCIDevice *pci_dev)
 970 {
 971     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 972
 973     virtio_pci_stop_ioeventfd(proxy);
 974     virtio_serial_exit(proxy->vdev);
 975     virtio_exit_pci(pci_dev);
 976 }
 977
 978 static int virtio_net_init_pci(PCIDevice *pci_dev)
 979 {
 980     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 981     VirtIODevice *vdev;
 982
 983     vdev = virtio_net_init(&pci_dev->qdev, &proxy->nic, &proxy->net,
 984                            proxy->host_features);
 985
 986     vdev->nvectors = proxy->nvectors;
 987     virtio_init_pci(proxy, vdev);
 988
 989     /* make the actual value visible */
 990     proxy->nvectors = vdev->nvectors;
 991     return 0;
 992 }
 993
 994 static void virtio_net_exit_pci(PCIDevice *pci_dev)
 995 {
 996     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 997
 998     virtio_pci_stop_ioeventfd(proxy);
 999     virtio_net_exit(proxy->vdev);
1000     virtio_exit_pci(pci_dev);
1001 }
1002
1003 static int virtio_balloon_init_pci(PCIDevice *pci_dev)
1004 {
1005     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1006     VirtIODevice *vdev;
1007
1008     if (proxy->class_code != PCI_CLASS_OTHERS &&
1009         proxy->class_code != PCI_CLASS_MEMORY_RAM) { /* qemu < 1.1 */
1010         proxy->class_code = PCI_CLASS_OTHERS;
1011     }
1012
1013     vdev = virtio_balloon_init(&pci_dev->qdev);
1014     if (!vdev) {
1015         return -1;
1016     }
1017     virtio_init_pci(proxy, vdev);
1018     return 0;
1019 }
1020
1021 static void virtio_balloon_exit_pci(PCIDevice *pci_dev)
1022 {
1023     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1024
1025     virtio_pci_stop_ioeventfd(proxy);
1026     virtio_balloon_exit(proxy->vdev);
1027     virtio_exit_pci(pci_dev);
1028 }
1029
1030 static int virtio_rng_init_pci(PCIDevice *pci_dev)
1031 {
1032     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1033     VirtIODevice *vdev;
1034
1035     if (proxy->rng.rng == NULL) {
1036         proxy->rng.default_backend = RNG_RANDOM(object_new(TYPE_RNG_RANDOM));
1037
1038         object_property_add_child(OBJECT(pci_dev),
1039                                   "default-backend",
1040                                   OBJECT(proxy->rng.default_backend),
1041                                   NULL);
1042
1043         object_property_set_link(OBJECT(pci_dev),
1044                                  OBJECT(proxy->rng.default_backend),
1045                                  "rng", NULL);
1046     }
1047
1048     vdev = virtio_rng_init(&pci_dev->qdev, &proxy->rng);
1049     if (!vdev) {
1050         return -1;
1051     }
1052     virtio_init_pci(proxy, vdev);
1053     return 0;
1054 }
1055
1056 static void virtio_rng_exit_pci(PCIDevice *pci_dev)
1057 {
1058     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1059
1060     virtio_pci_stop_ioeventfd(proxy);
1061     virtio_rng_exit(proxy->vdev);
1062     virtio_exit_pci(pci_dev);
1063 }
1064
1065 static Property virtio_net_properties[] = {
1066     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
1067     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
1068     DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features),
1069     DEFINE_NIC_PROPERTIES(VirtIOPCIProxy, nic),
1070     DEFINE_PROP_UINT32("x-txtimer", VirtIOPCIProxy, net.txtimer, TX_TIMER_INTERVAL),
1071     DEFINE_PROP_INT32("x-txburst", VirtIOPCIProxy, net.txburst, TX_BURST),
1072     DEFINE_PROP_STRING("tx", VirtIOPCIProxy, net.tx),
1073     DEFINE_PROP_END_OF_LIST(),
1074 };
1075
1076 static void virtio_net_class_init(ObjectClass *klass, void *data)
1077 {
1078     DeviceClass *dc = DEVICE_CLASS(klass);
1079     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1080
1081     k->init = virtio_net_init_pci;
1082     k->exit = virtio_net_exit_pci;
1083     k->romfile = "efi-virtio.rom";
1084     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1085     k->device_id = PCI_DEVICE_ID_VIRTIO_NET;
1086     k->revision = VIRTIO_PCI_ABI_VERSION;
1087     k->class_id = PCI_CLASS_NETWORK_ETHERNET;
1088     dc->reset = virtio_pci_reset;
1089     dc->props = virtio_net_properties;
1090 }
1091
1092 static const TypeInfo virtio_net_info = {
1093     .name          = "virtio-net-pci",
1094     .parent        = TYPE_PCI_DEVICE,
1095     .instance_size = sizeof(VirtIOPCIProxy),
1096     .class_init    = virtio_net_class_init,
1097 };
1098
1099 static Property virtio_serial_properties[] = {
1100     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1101     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1102     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1103     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1104     DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy, serial.max_virtserial_ports, 31),
1105     DEFINE_PROP_END_OF_LIST(),
1106 };
1107
1108 static void virtio_serial_class_init(ObjectClass *klass, void *data)
1109 {
1110     DeviceClass *dc = DEVICE_CLASS(klass);
1111     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1112
1113     k->init = virtio_serial_init_pci;
1114     k->exit = virtio_serial_exit_pci;
1115     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1116     k->device_id = PCI_DEVICE_ID_VIRTIO_CONSOLE;
1117     k->revision = VIRTIO_PCI_ABI_VERSION;
1118     k->class_id = PCI_CLASS_COMMUNICATION_OTHER;
1119     dc->reset = virtio_pci_reset;
1120     dc->props = virtio_serial_properties;
1121 }
1122
1123 static const TypeInfo virtio_serial_info = {
1124     .name          = "virtio-serial-pci",
1125     .parent        = TYPE_PCI_DEVICE,
1126     .instance_size = sizeof(VirtIOPCIProxy),
1127     .class_init    = virtio_serial_class_init,
1128 };
1129
1130 static Property virtio_balloon_properties[] = {
1131     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1132     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1133     DEFINE_PROP_END_OF_LIST(),
1134 };
1135
1136 static void virtio_balloon_class_init(ObjectClass *klass, void *data)
1137 {
1138     DeviceClass *dc = DEVICE_CLASS(klass);
1139     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1140
1141     k->init = virtio_balloon_init_pci;
1142     k->exit = virtio_balloon_exit_pci;
1143     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1144     k->device_id = PCI_DEVICE_ID_VIRTIO_BALLOON;
1145     k->revision = VIRTIO_PCI_ABI_VERSION;
1146     k->class_id = PCI_CLASS_OTHERS;
1147     dc->reset = virtio_pci_reset;
1148     dc->props = virtio_balloon_properties;
1149 }
1150
1151 static const TypeInfo virtio_balloon_info = {
1152     .name          = "virtio-balloon-pci",
1153     .parent        = TYPE_PCI_DEVICE,
1154     .instance_size = sizeof(VirtIOPCIProxy),
1155     .class_init    = virtio_balloon_class_init,
1156 };
1157
1158 static void virtio_rng_initfn(Object *obj)
1159 {
1160     PCIDevice *pci_dev = PCI_DEVICE(obj);
1161     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1162
1163     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
1164                              (Object **)&proxy->rng.rng, NULL);
1165 }
1166
1167 static Property virtio_rng_properties[] = {
1168     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1169     /* Set a default rate limit of 2^47 bytes per minute or roughly 2TB/s.  If
1170        you have an entropy source capable of generating more entropy than this
1171        and you can pass it through via virtio-rng, then hats off to you.  Until
1172        then, this is unlimited for all practical purposes.
1173     */
1174     DEFINE_PROP_UINT64("max-bytes", VirtIOPCIProxy, rng.max_bytes, INT64_MAX),
1175     DEFINE_PROP_UINT32("period", VirtIOPCIProxy, rng.period_ms, 1 << 16),
1176     DEFINE_PROP_END_OF_LIST(),
1177 };
1178
1179 static void virtio_rng_class_init(ObjectClass *klass, void *data)
1180 {
1181     DeviceClass *dc = DEVICE_CLASS(klass);
1182     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1183
1184     k->init = virtio_rng_init_pci;
1185     k->exit = virtio_rng_exit_pci;
1186     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1187     k->device_id = PCI_DEVICE_ID_VIRTIO_RNG;
1188     k->revision = VIRTIO_PCI_ABI_VERSION;
1189     k->class_id = PCI_CLASS_OTHERS;
1190     dc->reset = virtio_pci_reset;
1191     dc->props = virtio_rng_properties;
1192 }
1193
1194 static const TypeInfo virtio_rng_info = {
1195     .name          = "virtio-rng-pci",
1196     .parent        = TYPE_PCI_DEVICE,
1197     .instance_size = sizeof(VirtIOPCIProxy),
1198     .instance_init = virtio_rng_initfn,
1199     .class_init    = virtio_rng_class_init,
1200 };
1201
1202 #ifdef CONFIG_VIRTFS
1203 static int virtio_9p_init_pci(PCIDevice *pci_dev)
1204 {
1205     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
1206     VirtIODevice *vdev;
1207
1208     vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf);
1209     vdev->nvectors = proxy->nvectors;
1210     virtio_init_pci(proxy, vdev);
1211     /* make the actual value visible */
1212     proxy->nvectors = vdev->nvectors;
1213     return 0;
1214 }
1215
1216 static Property virtio_9p_properties[] = {
1217     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1218     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1219     DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
1220     DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag),
1221     DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id),
1222     DEFINE_PROP_END_OF_LIST(),
1223 };
1224
1225 static void virtio_9p_class_init(ObjectClass *klass, void *data)
1226 {
1227     DeviceClass *dc = DEVICE_CLASS(klass);
1228     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1229
1230     k->init = virtio_9p_init_pci;
1231     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1232     k->device_id = PCI_DEVICE_ID_VIRTIO_9P;
1233     k->revision = VIRTIO_PCI_ABI_VERSION;
1234     k->class_id = 0x2;
1235     dc->props = virtio_9p_properties;
1236     dc->reset = virtio_pci_reset;
1237 }
1238
1239 static const TypeInfo virtio_9p_info = {
1240     .name          = "virtio-9p-pci",
1241     .parent        = TYPE_PCI_DEVICE,
1242     .instance_size = sizeof(VirtIOPCIProxy),
1243     .class_init    = virtio_9p_class_init,
1244 };
1245 #endif
1246
1247 /*
1248  * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
1249  */
1250
1251 /* This is called by virtio-bus just after the device is plugged. */
1252 static void virtio_pci_device_plugged(DeviceState *d)
1253 {
1254     VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
1255     VirtioBusState *bus = &proxy->bus;
1256     uint8_t *config;
1257     uint32_t size;
1258
1259     proxy->vdev = bus->vdev;
1260
1261     config = proxy->pci_dev.config;
1262     if (proxy->class_code) {
1263         pci_config_set_class(config, proxy->class_code);
1264     }
1265     pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
1266                  pci_get_word(config + PCI_VENDOR_ID));
1267     pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus));
1268     config[PCI_INTERRUPT_PIN] = 1;
1269
1270     if (proxy->nvectors &&
1271         msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1)) {
1272         proxy->nvectors = 0;
1273     }
1274
1275     proxy->pci_dev.config_write = virtio_write_config;
1276
1277     size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev)
1278          + virtio_bus_get_vdev_config_len(bus);
1279     if (size & (size - 1)) {
1280         size = 1 << qemu_fls(size);
1281     }
1282
1283     memory_region_init_io(&proxy->bar, &virtio_pci_config_ops, proxy,
1284                           "virtio-pci", size);
1285     pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
1286                      &proxy->bar);
1287
1288     if (!kvm_has_many_ioeventfds()) {
1289         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
1290     }
1291
1292     proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
1293     proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
1294     proxy->host_features = virtio_bus_get_vdev_features(bus,
1295                                                       proxy->host_features);
1296 }
1297
1298 static int virtio_pci_init(PCIDevice *pci_dev)
1299 {
1300     VirtIOPCIProxy *dev = VIRTIO_PCI(pci_dev);
1301     VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
1302     virtio_pci_bus_new(&dev->bus, dev);
1303     if (k->init != NULL) {
1304         return k->init(dev);
1305     }
1306     return 0;
1307 }
1308
1309 static void virtio_pci_exit(PCIDevice *pci_dev)
1310 {
1311     VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
1312     virtio_pci_stop_ioeventfd(proxy);
1313     virtio_exit_pci(pci_dev);
1314 }
1315
1316 /*
1317  * This will be renamed virtio_pci_reset at the end of the series.
1318  * virtio_pci_reset is still in use at this moment.
1319  */
1320 static void virtio_pci_rst(DeviceState *qdev)
1321 {
1322     VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
1323     VirtioBusState *bus = VIRTIO_BUS(&proxy->bus);
1324     virtio_pci_stop_ioeventfd(proxy);
1325     virtio_bus_reset(bus);
1326     msix_unuse_all_vectors(&proxy->pci_dev);
1327     proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
1328 }
1329
1330 static void virtio_pci_class_init(ObjectClass *klass, void *data)
1331 {
1332     DeviceClass *dc = DEVICE_CLASS(klass);
1333     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
1334
1335     k->init = virtio_pci_init;
1336     k->exit = virtio_pci_exit;
1337     k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1338     k->revision = VIRTIO_PCI_ABI_VERSION;
1339     k->class_id = PCI_CLASS_OTHERS;
1340     dc->reset = virtio_pci_rst;
1341 }
1342
1343 static const TypeInfo virtio_pci_info = {
1344     .name          = TYPE_VIRTIO_PCI,
1345     .parent        = TYPE_PCI_DEVICE,
1346     .instance_size = sizeof(VirtIOPCIProxy),
1347     .class_init    = virtio_pci_class_init,
1348     .class_size    = sizeof(VirtioPCIClass),
1349     .abstract      = true,
1350 };
1351
1352 /* virtio-blk-pci */
1353
1354 static Property virtio_blk_pci_properties[] = {
1355     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
1356     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1357                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1358     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
1359 #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE
1360     DEFINE_PROP_BIT("x-data-plane", VirtIOBlkPCI, blk.data_plane, 0, false),
1361 #endif
1362     DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features),
1363     DEFINE_VIRTIO_BLK_PROPERTIES(VirtIOBlkPCI, blk),
1364     DEFINE_PROP_END_OF_LIST(),
1365 };
1366
1367 static int virtio_blk_pci_init(VirtIOPCIProxy *vpci_dev)
1368 {
1369     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(vpci_dev);
1370     DeviceState *vdev = DEVICE(&dev->vdev);
1371     virtio_blk_set_conf(vdev, &(dev->blk));
1372     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1373     if (qdev_init(vdev) < 0) {
1374         return -1;
1375     }
1376     return 0;
1377 }
1378
1379 static void virtio_blk_pci_class_init(ObjectClass *klass, void *data)
1380 {
1381     DeviceClass *dc = DEVICE_CLASS(klass);
1382     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1383     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1384
1385     dc->props = virtio_blk_pci_properties;
1386     k->init = virtio_blk_pci_init;
1387     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1388     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_BLOCK;
1389     pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
1390     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1391 }
1392
1393 static void virtio_blk_pci_instance_init(Object *obj)
1394 {
1395     VirtIOBlkPCI *dev = VIRTIO_BLK_PCI(obj);
1396     object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_BLK);
1397     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1398 }
1399
1400 static const TypeInfo virtio_blk_pci_info = {
1401     .name          = TYPE_VIRTIO_BLK_PCI,
1402     .parent        = TYPE_VIRTIO_PCI,
1403     .instance_size = sizeof(VirtIOBlkPCI),
1404     .instance_init = virtio_blk_pci_instance_init,
1405     .class_init    = virtio_blk_pci_class_init,
1406 };
1407
1408 /* virtio-scsi-pci */
1409
1410 static Property virtio_scsi_pci_properties[] = {
1411     DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
1412                     VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
1413     DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
1414                        DEV_NVECTORS_UNSPECIFIED),
1415     DEFINE_VIRTIO_SCSI_FEATURES(VirtIOPCIProxy, host_features),
1416     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSIPCI, vdev.conf),
1417     DEFINE_PROP_END_OF_LIST(),
1418 };
1419
1420 static int virtio_scsi_pci_init_pci(VirtIOPCIProxy *vpci_dev)
1421 {
1422     VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(vpci_dev);
1423     DeviceState *vdev = DEVICE(&dev->vdev);
1424
1425     if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
1426         vpci_dev->nvectors = dev->vdev.conf.num_queues + 3;
1427     }
1428
1429     qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
1430     if (qdev_init(vdev) < 0) {
1431         return -1;
1432     }
1433     return 0;
1434 }
1435
1436 static void virtio_scsi_pci_class_init(ObjectClass *klass, void *data)
1437 {
1438     DeviceClass *dc = DEVICE_CLASS(klass);
1439     VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
1440     PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
1441     k->init = virtio_scsi_pci_init_pci;
1442     dc->props = virtio_scsi_pci_properties;
1443     pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
1444     pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
1445     pcidev_k->revision = 0x00;
1446     pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
1447 }
1448
1449 static void virtio_scsi_pci_instance_init(Object *obj)
1450 {
1451     VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(obj);
1452     object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_SCSI);
1453     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
1454 }
1455
1456 static const TypeInfo virtio_scsi_pci_info = {
1457     .name          = TYPE_VIRTIO_SCSI_PCI,
1458     .parent        = TYPE_VIRTIO_PCI,
1459     .instance_size = sizeof(VirtIOSCSIPCI),
1460     .instance_init = virtio_scsi_pci_instance_init,
1461     .class_init    = virtio_scsi_pci_class_init,
1462 };
1463
1464 /* virtio-pci-bus */
1465
1466 void virtio_pci_bus_new(VirtioBusState *bus, VirtIOPCIProxy *dev)
1467 {
1468     DeviceState *qdev = DEVICE(dev);
1469     BusState *qbus;
1470     qbus_create_inplace((BusState *)bus, TYPE_VIRTIO_PCI_BUS, qdev, NULL);
1471     qbus = BUS(bus);
1472     qbus->allow_hotplug = 1;
1473 }
1474
1475 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
1476 {
1477     BusClass *bus_class = BUS_CLASS(klass);
1478     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
1479     bus_class->max_dev = 1;
1480     k->notify = virtio_pci_notify;
1481     k->save_config = virtio_pci_save_config;
1482     k->load_config = virtio_pci_load_config;
1483     k->save_queue = virtio_pci_save_queue;
1484     k->load_queue = virtio_pci_load_queue;
1485     k->get_features = virtio_pci_get_features;
1486     k->query_guest_notifiers = virtio_pci_query_guest_notifiers;
1487     k->set_host_notifier = virtio_pci_set_host_notifier;
1488     k->set_guest_notifiers = virtio_pci_set_guest_notifiers;
1489     k->vmstate_change = virtio_pci_vmstate_change;
1490     k->device_plugged = virtio_pci_device_plugged;
1491 }
1492
1493 static const TypeInfo virtio_pci_bus_info = {
1494     .name          = TYPE_VIRTIO_PCI_BUS,
1495     .parent        = TYPE_VIRTIO_BUS,
1496     .instance_size = sizeof(VirtioPCIBusState),
1497     .class_init    = virtio_pci_bus_class_init,
1498 };
1499
1500 static void virtio_pci_register_types(void)
1501 {
1502     type_register_static(&virtio_net_info);
1503     type_register_static(&virtio_serial_info);
1504     type_register_static(&virtio_balloon_info);
1505     type_register_static(&virtio_rng_info);
1506     type_register_static(&virtio_pci_bus_info);
1507     type_register_static(&virtio_pci_info);
1508 #ifdef CONFIG_VIRTFS
1509     type_register_static(&virtio_9p_info);
1510 #endif
1511     type_register_static(&virtio_blk_pci_info);
1512     type_register_static(&virtio_scsi_pci_info);
1513 }
1514
1515 type_init(virtio_pci_register_types)