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  */
  15
  16 #include <inttypes.h>
  17
  18 #include "virtio.h"
  19 #include "virtio-blk.h"
  20 #include "virtio-net.h"
  21 #include "virtio-serial.h"
  22 #include "pci.h"
  23 #include "qemu-error.h"
  24 #include "msix.h"
  25 #include "net.h"
  26 #include "loader.h"
  27 #include "kvm.h"
  28 #include "blockdev.h"
  29 #include "virtio-pci.h"
  30 #include "range.h"
  31
  32 /* from Linux's linux/virtio_pci.h */
  33
  34 /* A 32-bit r/o bitmask of the features supported by the host */
  35 #define VIRTIO_PCI_HOST_FEATURES        0
  36
  37 /* A 32-bit r/w bitmask of features activated by the guest */
  38 #define VIRTIO_PCI_GUEST_FEATURES       4
  39
  40 /* A 32-bit r/w PFN for the currently selected queue */
  41 #define VIRTIO_PCI_QUEUE_PFN            8
  42
  43 /* A 16-bit r/o queue size for the currently selected queue */
  44 #define VIRTIO_PCI_QUEUE_NUM            12
  45
  46 /* A 16-bit r/w queue selector */
  47 #define VIRTIO_PCI_QUEUE_SEL            14
  48
  49 /* A 16-bit r/w queue notifier */
  50 #define VIRTIO_PCI_QUEUE_NOTIFY         16
  51
  52 /* An 8-bit device status register.  */
  53 #define VIRTIO_PCI_STATUS               18
  54
  55 /* An 8-bit r/o interrupt status register.  Reading the value will return the
  56  * current contents of the ISR and will also clear it.  This is effectively
  57  * a read-and-acknowledge. */
  58 #define VIRTIO_PCI_ISR                  19
  59
  60 /* MSI-X registers: only enabled if MSI-X is enabled. */
  61 /* A 16-bit vector for configuration changes. */
  62 #define VIRTIO_MSI_CONFIG_VECTOR        20
  63 /* A 16-bit vector for selected queue notifications. */
  64 #define VIRTIO_MSI_QUEUE_VECTOR         22
  65
  66 /* Config space size */
  67 #define VIRTIO_PCI_CONFIG_NOMSI         20
  68 #define VIRTIO_PCI_CONFIG_MSI           24
  69 #define VIRTIO_PCI_REGION_SIZE(dev)     (msix_present(dev) ? \
  70                                          VIRTIO_PCI_CONFIG_MSI : \
  71                                          VIRTIO_PCI_CONFIG_NOMSI)
  72
  73 /* The remaining space is defined by each driver as the per-driver
  74  * configuration space */
  75 #define VIRTIO_PCI_CONFIG(dev)          (msix_enabled(dev) ? \
  76                                          VIRTIO_PCI_CONFIG_MSI : \
  77                                          VIRTIO_PCI_CONFIG_NOMSI)
  78
  79 /* How many bits to shift physical queue address written to QUEUE_PFN.
  80  * 12 is historical, and due to x86 page size. */
  81 #define VIRTIO_PCI_QUEUE_ADDR_SHIFT    12
  82
  83 /* Flags track per-device state like workarounds for quirks in older guests. */
  84 #define VIRTIO_PCI_FLAG_BUS_MASTER_BUG  (1 << 0)
  85
  86 /* Performance improves when virtqueue kick processing is decoupled from the
  87  * vcpu thread using ioeventfd for some devices. */
  88 #define VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT 1
  89 #define VIRTIO_PCI_FLAG_USE_IOEVENTFD   (1 << VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT)
  90
  91 /* QEMU doesn't strictly need write barriers since everything runs in
  92  * lock-step.  We'll leave the calls to wmb() in though to make it obvious for
  93  * KVM or if kqemu gets SMP support.
  94  */
  95 #define wmb() do { } while (0)
  96
  97 /* virtio device */
  98
  99 static void virtio_pci_notify(void *opaque, uint16_t vector)
 100 {
 101     VirtIOPCIProxy *proxy = opaque;
 102     if (msix_enabled(&proxy->pci_dev))
 103         msix_notify(&proxy->pci_dev, vector);
 104     else
 105         qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
 106 }
 107
 108 static void virtio_pci_save_config(void * opaque, QEMUFile *f)
 109 {
 110     VirtIOPCIProxy *proxy = opaque;
 111     pci_device_save(&proxy->pci_dev, f);
 112     msix_save(&proxy->pci_dev, f);
 113     if (msix_present(&proxy->pci_dev))
 114         qemu_put_be16(f, proxy->vdev->config_vector);
 115 }
 116
 117 static void virtio_pci_save_queue(void * opaque, int n, QEMUFile *f)
 118 {
 119     VirtIOPCIProxy *proxy = opaque;
 120     if (msix_present(&proxy->pci_dev))
 121         qemu_put_be16(f, virtio_queue_vector(proxy->vdev, n));
 122 }
 123
 124 static int virtio_pci_load_config(void * opaque, QEMUFile *f)
 125 {
 126     VirtIOPCIProxy *proxy = opaque;
 127     int ret;
 128     ret = pci_device_load(&proxy->pci_dev, f);
 129     if (ret) {
 130         return ret;
 131     }
 132     msix_load(&proxy->pci_dev, f);
 133     if (msix_present(&proxy->pci_dev)) {
 134         qemu_get_be16s(f, &proxy->vdev->config_vector);
 135     } else {
 136         proxy->vdev->config_vector = VIRTIO_NO_VECTOR;
 137     }
 138     if (proxy->vdev->config_vector != VIRTIO_NO_VECTOR) {
 139         return msix_vector_use(&proxy->pci_dev, proxy->vdev->config_vector);
 140     }
 141     return 0;
 142 }
 143
 144 static int virtio_pci_load_queue(void * opaque, int n, QEMUFile *f)
 145 {
 146     VirtIOPCIProxy *proxy = opaque;
 147     uint16_t vector;
 148     if (msix_present(&proxy->pci_dev)) {
 149         qemu_get_be16s(f, &vector);
 150     } else {
 151         vector = VIRTIO_NO_VECTOR;
 152     }
 153     virtio_queue_set_vector(proxy->vdev, n, vector);
 154     if (vector != VIRTIO_NO_VECTOR) {
 155         return msix_vector_use(&proxy->pci_dev, vector);
 156     }
 157     return 0;
 158 }
 159
 160 static int virtio_pci_set_host_notifier_internal(VirtIOPCIProxy *proxy,
 161                                                  int n, bool assign)
 162 {
 163     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 164     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
 165     int r = 0;
 166
 167     if (assign) {
 168         r = event_notifier_init(notifier, 1);
 169         if (r < 0) {
 170             error_report("%s: unable to init event notifier: %d",
 171                          __func__, r);
 172             return r;
 173         }
 174         memory_region_add_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 175                                   true, n, event_notifier_get_fd(notifier));
 176     } else {
 177         memory_region_del_eventfd(&proxy->bar, VIRTIO_PCI_QUEUE_NOTIFY, 2,
 178                                   true, n, event_notifier_get_fd(notifier));
 179         /* Handle the race condition where the guest kicked and we deassigned
 180          * before we got around to handling the kick.
 181          */
 182         if (event_notifier_test_and_clear(notifier)) {
 183             virtio_queue_notify_vq(vq);
 184         }
 185
 186         event_notifier_cleanup(notifier);
 187     }
 188     return r;
 189 }
 190
 191 static void virtio_pci_host_notifier_read(void *opaque)
 192 {
 193     VirtQueue *vq = opaque;
 194     EventNotifier *n = virtio_queue_get_host_notifier(vq);
 195     if (event_notifier_test_and_clear(n)) {
 196         virtio_queue_notify_vq(vq);
 197     }
 198 }
 199
 200 static void virtio_pci_set_host_notifier_fd_handler(VirtIOPCIProxy *proxy,
 201                                                     int n, bool assign)
 202 {
 203     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 204     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
 205     if (assign) {
 206         qemu_set_fd_handler(event_notifier_get_fd(notifier),
 207                             virtio_pci_host_notifier_read, NULL, vq);
 208     } else {
 209         qemu_set_fd_handler(event_notifier_get_fd(notifier),
 210                             NULL, NULL, NULL);
 211     }
 212 }
 213
 214 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy)
 215 {
 216     int n, r;
 217
 218     if (!(proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) ||
 219         proxy->ioeventfd_disabled ||
 220         proxy->ioeventfd_started) {
 221         return;
 222     }
 223
 224     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 225         if (!virtio_queue_get_num(proxy->vdev, n)) {
 226             continue;
 227         }
 228
 229         r = virtio_pci_set_host_notifier_internal(proxy, n, true);
 230         if (r < 0) {
 231             goto assign_error;
 232         }
 233
 234         virtio_pci_set_host_notifier_fd_handler(proxy, n, true);
 235     }
 236     proxy->ioeventfd_started = true;
 237     return;
 238
 239 assign_error:
 240     while (--n >= 0) {
 241         if (!virtio_queue_get_num(proxy->vdev, n)) {
 242             continue;
 243         }
 244
 245         virtio_pci_set_host_notifier_fd_handler(proxy, n, false);
 246         r = virtio_pci_set_host_notifier_internal(proxy, n, false);
 247         assert(r >= 0);
 248     }
 249     proxy->ioeventfd_started = false;
 250     error_report("%s: failed. Fallback to a userspace (slower).", __func__);
 251 }
 252
 253 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy)
 254 {
 255     int r;
 256     int n;
 257
 258     if (!proxy->ioeventfd_started) {
 259         return;
 260     }
 261
 262     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 263         if (!virtio_queue_get_num(proxy->vdev, n)) {
 264             continue;
 265         }
 266
 267         virtio_pci_set_host_notifier_fd_handler(proxy, n, false);
 268         r = virtio_pci_set_host_notifier_internal(proxy, n, false);
 269         assert(r >= 0);
 270     }
 271     proxy->ioeventfd_started = false;
 272 }
 273
 274 static void virtio_pci_reset(DeviceState *d)
 275 {
 276     VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 277     virtio_pci_stop_ioeventfd(proxy);
 278     virtio_reset(proxy->vdev);
 279     msix_reset(&proxy->pci_dev);
 280     proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 281 }
 282
 283 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
 284 {
 285     VirtIOPCIProxy *proxy = opaque;
 286     VirtIODevice *vdev = proxy->vdev;
 287     target_phys_addr_t pa;
 288
 289     switch (addr) {
 290     case VIRTIO_PCI_GUEST_FEATURES:
 291         /* Guest does not negotiate properly?  We have to assume nothing. */
 292         if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
 293             if (vdev->bad_features)
 294                 val = proxy->host_features & vdev->bad_features(vdev);
 295             else
 296                 val = 0;
 297         }
 298         if (vdev->set_features)
 299             vdev->set_features(vdev, val);
 300         vdev->guest_features = val;
 301         break;
 302     case VIRTIO_PCI_QUEUE_PFN:
 303         pa = (target_phys_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 304         if (pa == 0) {
 305             virtio_pci_stop_ioeventfd(proxy);
 306             virtio_reset(proxy->vdev);
 307             msix_unuse_all_vectors(&proxy->pci_dev);
 308         }
 309         else
 310             virtio_queue_set_addr(vdev, vdev->queue_sel, pa);
 311         break;
 312     case VIRTIO_PCI_QUEUE_SEL:
 313         if (val < VIRTIO_PCI_QUEUE_MAX)
 314             vdev->queue_sel = val;
 315         break;
 316     case VIRTIO_PCI_QUEUE_NOTIFY:
 317         if (val < VIRTIO_PCI_QUEUE_MAX) {
 318             virtio_queue_notify(vdev, val);
 319         }
 320         break;
 321     case VIRTIO_PCI_STATUS:
 322         if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
 323             virtio_pci_stop_ioeventfd(proxy);
 324         }
 325
 326         virtio_set_status(vdev, val & 0xFF);
 327
 328         if (val & VIRTIO_CONFIG_S_DRIVER_OK) {
 329             virtio_pci_start_ioeventfd(proxy);
 330         }
 331
 332         if (vdev->status == 0) {
 333             virtio_reset(proxy->vdev);
 334             msix_unuse_all_vectors(&proxy->pci_dev);
 335         }
 336
 337         /* Linux before 2.6.34 sets the device as OK without enabling
 338            the PCI device bus master bit. In this case we need to disable
 339            some safety checks. */
 340         if ((val & VIRTIO_CONFIG_S_DRIVER_OK) &&
 341             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 342             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 343         }
 344         break;
 345     case VIRTIO_MSI_CONFIG_VECTOR:
 346         msix_vector_unuse(&proxy->pci_dev, vdev->config_vector);
 347         /* Make it possible for guest to discover an error took place. */
 348         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 349             val = VIRTIO_NO_VECTOR;
 350         vdev->config_vector = val;
 351         break;
 352     case VIRTIO_MSI_QUEUE_VECTOR:
 353         msix_vector_unuse(&proxy->pci_dev,
 354                           virtio_queue_vector(vdev, vdev->queue_sel));
 355         /* Make it possible for guest to discover an error took place. */
 356         if (msix_vector_use(&proxy->pci_dev, val) < 0)
 357             val = VIRTIO_NO_VECTOR;
 358         virtio_queue_set_vector(vdev, vdev->queue_sel, val);
 359         break;
 360     default:
 361         error_report("%s: unexpected address 0x%x value 0x%x",
 362                      __func__, addr, val);
 363         break;
 364     }
 365 }
 366
 367 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr)
 368 {
 369     VirtIODevice *vdev = proxy->vdev;
 370     uint32_t ret = 0xFFFFFFFF;
 371
 372     switch (addr) {
 373     case VIRTIO_PCI_HOST_FEATURES:
 374         ret = proxy->host_features;
 375         break;
 376     case VIRTIO_PCI_GUEST_FEATURES:
 377         ret = vdev->guest_features;
 378         break;
 379     case VIRTIO_PCI_QUEUE_PFN:
 380         ret = virtio_queue_get_addr(vdev, vdev->queue_sel)
 381               >> VIRTIO_PCI_QUEUE_ADDR_SHIFT;
 382         break;
 383     case VIRTIO_PCI_QUEUE_NUM:
 384         ret = virtio_queue_get_num(vdev, vdev->queue_sel);
 385         break;
 386     case VIRTIO_PCI_QUEUE_SEL:
 387         ret = vdev->queue_sel;
 388         break;
 389     case VIRTIO_PCI_STATUS:
 390         ret = vdev->status;
 391         break;
 392     case VIRTIO_PCI_ISR:
 393         /* reading from the ISR also clears it. */
 394         ret = vdev->isr;
 395         vdev->isr = 0;
 396         qemu_set_irq(proxy->pci_dev.irq[0], 0);
 397         break;
 398     case VIRTIO_MSI_CONFIG_VECTOR:
 399         ret = vdev->config_vector;
 400         break;
 401     case VIRTIO_MSI_QUEUE_VECTOR:
 402         ret = virtio_queue_vector(vdev, vdev->queue_sel);
 403         break;
 404     default:
 405         break;
 406     }
 407
 408     return ret;
 409 }
 410
 411 static uint32_t virtio_pci_config_readb(void *opaque, uint32_t addr)
 412 {
 413     VirtIOPCIProxy *proxy = opaque;
 414     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 415     if (addr < config)
 416         return virtio_ioport_read(proxy, addr);
 417     addr -= config;
 418     return virtio_config_readb(proxy->vdev, addr);
 419 }
 420
 421 static uint32_t virtio_pci_config_readw(void *opaque, uint32_t addr)
 422 {
 423     VirtIOPCIProxy *proxy = opaque;
 424     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 425     if (addr < config)
 426         return virtio_ioport_read(proxy, addr);
 427     addr -= config;
 428     return virtio_config_readw(proxy->vdev, addr);
 429 }
 430
 431 static uint32_t virtio_pci_config_readl(void *opaque, uint32_t addr)
 432 {
 433     VirtIOPCIProxy *proxy = opaque;
 434     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 435     if (addr < config)
 436         return virtio_ioport_read(proxy, addr);
 437     addr -= config;
 438     return virtio_config_readl(proxy->vdev, addr);
 439 }
 440
 441 static void virtio_pci_config_writeb(void *opaque, uint32_t addr, uint32_t val)
 442 {
 443     VirtIOPCIProxy *proxy = opaque;
 444     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 445     if (addr < config) {
 446         virtio_ioport_write(proxy, addr, val);
 447         return;
 448     }
 449     addr -= config;
 450     virtio_config_writeb(proxy->vdev, addr, val);
 451 }
 452
 453 static void virtio_pci_config_writew(void *opaque, uint32_t addr, uint32_t val)
 454 {
 455     VirtIOPCIProxy *proxy = opaque;
 456     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 457     if (addr < config) {
 458         virtio_ioport_write(proxy, addr, val);
 459         return;
 460     }
 461     addr -= config;
 462     virtio_config_writew(proxy->vdev, addr, val);
 463 }
 464
 465 static void virtio_pci_config_writel(void *opaque, uint32_t addr, uint32_t val)
 466 {
 467     VirtIOPCIProxy *proxy = opaque;
 468     uint32_t config = VIRTIO_PCI_CONFIG(&proxy->pci_dev);
 469     if (addr < config) {
 470         virtio_ioport_write(proxy, addr, val);
 471         return;
 472     }
 473     addr -= config;
 474     virtio_config_writel(proxy->vdev, addr, val);
 475 }
 476
 477 const MemoryRegionPortio virtio_portio[] = {
 478     { 0, 0x10000, 1, .write = virtio_pci_config_writeb, },
 479     { 0, 0x10000, 2, .write = virtio_pci_config_writew, },
 480     { 0, 0x10000, 4, .write = virtio_pci_config_writel, },
 481     { 0, 0x10000, 1, .read = virtio_pci_config_readb, },
 482     { 0, 0x10000, 2, .read = virtio_pci_config_readw, },
 483     { 0, 0x10000, 4, .read = virtio_pci_config_readl, },
 484     PORTIO_END_OF_LIST()
 485 };
 486
 487 static const MemoryRegionOps virtio_pci_config_ops = {
 488     .old_portio = virtio_portio,
 489     .endianness = DEVICE_LITTLE_ENDIAN,
 490 };
 491
 492 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 493                                 uint32_t val, int len)
 494 {
 495     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 496
 497     pci_default_write_config(pci_dev, address, val, len);
 498
 499     if (range_covers_byte(address, len, PCI_COMMAND) &&
 500         !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER) &&
 501         !(proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG)) {
 502         virtio_pci_stop_ioeventfd(proxy);
 503         virtio_set_status(proxy->vdev,
 504                           proxy->vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK);
 505     }
 506
 507     msix_write_config(pci_dev, address, val, len);
 508 }
 509
 510 static unsigned virtio_pci_get_features(void *opaque)
 511 {
 512     VirtIOPCIProxy *proxy = opaque;
 513     return proxy->host_features;
 514 }
 515
 516 static void virtio_pci_guest_notifier_read(void *opaque)
 517 {
 518     VirtQueue *vq = opaque;
 519     EventNotifier *n = virtio_queue_get_guest_notifier(vq);
 520     if (event_notifier_test_and_clear(n)) {
 521         virtio_irq(vq);
 522     }
 523 }
 524
 525 static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign)
 526 {
 527     VirtIOPCIProxy *proxy = opaque;
 528     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
 529     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 530
 531     if (assign) {
 532         int r = event_notifier_init(notifier, 0);
 533         if (r < 0) {
 534             return r;
 535         }
 536         qemu_set_fd_handler(event_notifier_get_fd(notifier),
 537                             virtio_pci_guest_notifier_read, NULL, vq);
 538     } else {
 539         qemu_set_fd_handler(event_notifier_get_fd(notifier),
 540                             NULL, NULL, NULL);
 541         event_notifier_cleanup(notifier);
 542     }
 543
 544     return 0;
 545 }
 546
 547 static bool virtio_pci_query_guest_notifiers(void *opaque)
 548 {
 549     VirtIOPCIProxy *proxy = opaque;
 550     return msix_enabled(&proxy->pci_dev);
 551 }
 552
 553 static int virtio_pci_set_guest_notifiers(void *opaque, bool assign)
 554 {
 555     VirtIOPCIProxy *proxy = opaque;
 556     VirtIODevice *vdev = proxy->vdev;
 557     int r, n;
 558
 559     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 560         if (!virtio_queue_get_num(vdev, n)) {
 561             break;
 562         }
 563
 564         r = virtio_pci_set_guest_notifier(opaque, n, assign);
 565         if (r < 0) {
 566             goto assign_error;
 567         }
 568     }
 569
 570     return 0;
 571
 572 assign_error:
 573     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
 574     while (--n >= 0) {
 575         virtio_pci_set_guest_notifier(opaque, n, !assign);
 576     }
 577     return r;
 578 }
 579
 580 static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign)
 581 {
 582     VirtIOPCIProxy *proxy = opaque;
 583
 584     /* Stop using ioeventfd for virtqueue kick if the device starts using host
 585      * notifiers.  This makes it easy to avoid stepping on each others' toes.
 586      */
 587     proxy->ioeventfd_disabled = assign;
 588     if (assign) {
 589         virtio_pci_stop_ioeventfd(proxy);
 590     }
 591     /* We don't need to start here: it's not needed because backend
 592      * currently only stops on status change away from ok,
 593      * reset, vmstop and such. If we do add code to start here,
 594      * need to check vmstate, device state etc. */
 595     return virtio_pci_set_host_notifier_internal(proxy, n, assign);
 596 }
 597
 598 static void virtio_pci_vmstate_change(void *opaque, bool running)
 599 {
 600     VirtIOPCIProxy *proxy = opaque;
 601
 602     if (running) {
 603         /* Try to find out if the guest has bus master disabled, but is
 604            in ready state. Then we have a buggy guest OS. */
 605         if ((proxy->vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
 606             !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) {
 607             proxy->flags |= VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
 608         }
 609         virtio_pci_start_ioeventfd(proxy);
 610     } else {
 611         virtio_pci_stop_ioeventfd(proxy);
 612     }
 613 }
 614
 615 static const VirtIOBindings virtio_pci_bindings = {
 616     .notify = virtio_pci_notify,
 617     .save_config = virtio_pci_save_config,
 618     .load_config = virtio_pci_load_config,
 619     .save_queue = virtio_pci_save_queue,
 620     .load_queue = virtio_pci_load_queue,
 621     .get_features = virtio_pci_get_features,
 622     .query_guest_notifiers = virtio_pci_query_guest_notifiers,
 623     .set_host_notifier = virtio_pci_set_host_notifier,
 624     .set_guest_notifiers = virtio_pci_set_guest_notifiers,
 625     .vmstate_change = virtio_pci_vmstate_change,
 626 };
 627
 628 void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev)
 629 {
 630     uint8_t *config;
 631     uint32_t size;
 632
 633     proxy->vdev = vdev;
 634
 635     config = proxy->pci_dev.config;
 636
 637     if (proxy->class_code) {
 638         pci_config_set_class(config, proxy->class_code);
 639     }
 640     pci_set_word(config + 0x2c, pci_get_word(config + PCI_VENDOR_ID));
 641     pci_set_word(config + 0x2e, vdev->device_id);
 642     config[0x3d] = 1;
 643
 644     if (vdev->nvectors && !msix_init(&proxy->pci_dev, vdev->nvectors, 1, 0)) {
 645         pci_register_bar(&proxy->pci_dev, 1,
 646                          msix_bar_size(&proxy->pci_dev),
 647                          PCI_BASE_ADDRESS_SPACE_MEMORY,
 648                          msix_mmio_map);
 649     } else
 650         vdev->nvectors = 0;
 651
 652     proxy->pci_dev.config_write = virtio_write_config;
 653
 654     size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) + vdev->config_len;
 655     if (size & (size-1))
 656         size = 1 << qemu_fls(size);
 657
 658     memory_region_init_io(&proxy->bar, &virtio_pci_config_ops, proxy,
 659                           "virtio-pci", size);
 660     pci_register_bar_region(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
 661                             &proxy->bar);
 662
 663     if (!kvm_has_many_ioeventfds()) {
 664         proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
 665     }
 666
 667     virtio_bind_device(vdev, &virtio_pci_bindings, proxy);
 668     proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
 669     proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
 670     proxy->host_features = vdev->get_features(vdev, proxy->host_features);
 671 }
 672
 673 static int virtio_blk_init_pci(PCIDevice *pci_dev)
 674 {
 675     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 676     VirtIODevice *vdev;
 677
 678     if (proxy->class_code != PCI_CLASS_STORAGE_SCSI &&
 679         proxy->class_code != PCI_CLASS_STORAGE_OTHER)
 680         proxy->class_code = PCI_CLASS_STORAGE_SCSI;
 681
 682     vdev = virtio_blk_init(&pci_dev->qdev, &proxy->block,
 683                            &proxy->block_serial);
 684     if (!vdev) {
 685         return -1;
 686     }
 687     vdev->nvectors = proxy->nvectors;
 688     virtio_init_pci(proxy, vdev);
 689     /* make the actual value visible */
 690     proxy->nvectors = vdev->nvectors;
 691     return 0;
 692 }
 693
 694 static int virtio_exit_pci(PCIDevice *pci_dev)
 695 {
 696     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 697
 698     memory_region_destroy(&proxy->bar);
 699     return msix_uninit(pci_dev);
 700 }
 701
 702 static int virtio_blk_exit_pci(PCIDevice *pci_dev)
 703 {
 704     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 705
 706     virtio_pci_stop_ioeventfd(proxy);
 707     virtio_blk_exit(proxy->vdev);
 708     blockdev_mark_auto_del(proxy->block.bs);
 709     return virtio_exit_pci(pci_dev);
 710 }
 711
 712 static int virtio_serial_init_pci(PCIDevice *pci_dev)
 713 {
 714     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 715     VirtIODevice *vdev;
 716
 717     if (proxy->class_code != PCI_CLASS_COMMUNICATION_OTHER &&
 718         proxy->class_code != PCI_CLASS_DISPLAY_OTHER && /* qemu 0.10 */
 719         proxy->class_code != PCI_CLASS_OTHERS)          /* qemu-kvm  */
 720         proxy->class_code = PCI_CLASS_COMMUNICATION_OTHER;
 721
 722     vdev = virtio_serial_init(&pci_dev->qdev, &proxy->serial);
 723     if (!vdev) {
 724         return -1;
 725     }
 726     vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED
 727                                         ? proxy->serial.max_virtserial_ports + 1
 728                                         : proxy->nvectors;
 729     virtio_init_pci(proxy, vdev);
 730     proxy->nvectors = vdev->nvectors;
 731     return 0;
 732 }
 733
 734 static int virtio_serial_exit_pci(PCIDevice *pci_dev)
 735 {
 736     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 737
 738     virtio_pci_stop_ioeventfd(proxy);
 739     virtio_serial_exit(proxy->vdev);
 740     return virtio_exit_pci(pci_dev);
 741 }
 742
 743 static int virtio_net_init_pci(PCIDevice *pci_dev)
 744 {
 745     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 746     VirtIODevice *vdev;
 747
 748     vdev = virtio_net_init(&pci_dev->qdev, &proxy->nic, &proxy->net);
 749
 750     vdev->nvectors = proxy->nvectors;
 751     virtio_init_pci(proxy, vdev);
 752
 753     /* make the actual value visible */
 754     proxy->nvectors = vdev->nvectors;
 755     return 0;
 756 }
 757
 758 static int virtio_net_exit_pci(PCIDevice *pci_dev)
 759 {
 760     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 761
 762     virtio_pci_stop_ioeventfd(proxy);
 763     virtio_net_exit(proxy->vdev);
 764     return virtio_exit_pci(pci_dev);
 765 }
 766
 767 static int virtio_balloon_init_pci(PCIDevice *pci_dev)
 768 {
 769     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 770     VirtIODevice *vdev;
 771
 772     vdev = virtio_balloon_init(&pci_dev->qdev);
 773     if (!vdev) {
 774         return -1;
 775     }
 776     virtio_init_pci(proxy, vdev);
 777     return 0;
 778 }
 779
 780 static int virtio_balloon_exit_pci(PCIDevice *pci_dev)
 781 {
 782     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
 783
 784     virtio_pci_stop_ioeventfd(proxy);
 785     virtio_balloon_exit(proxy->vdev);
 786     return virtio_exit_pci(pci_dev);
 787 }
 788
 789 static PCIDeviceInfo virtio_info[] = {
 790     {
 791         .qdev.name = "virtio-blk-pci",
 792         .qdev.alias = "virtio-blk",
 793         .qdev.size = sizeof(VirtIOPCIProxy),
 794         .init      = virtio_blk_init_pci,
 795         .exit      = virtio_blk_exit_pci,
 796         .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
 797         .device_id = PCI_DEVICE_ID_VIRTIO_BLOCK,
 798         .revision  = VIRTIO_PCI_ABI_VERSION,
 799         .class_id  = PCI_CLASS_STORAGE_SCSI,
 800         .qdev.props = (Property[]) {
 801             DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
 802             DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, block),
 803             DEFINE_PROP_STRING("serial", VirtIOPCIProxy, block_serial),
 804             DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
 805                             VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
 806             DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
 807             DEFINE_VIRTIO_BLK_FEATURES(VirtIOPCIProxy, host_features),
 808             DEFINE_PROP_END_OF_LIST(),
 809         },
 810         .qdev.reset = virtio_pci_reset,
 811     },{
 812         .qdev.name  = "virtio-net-pci",
 813         .qdev.alias = "virtio-net",
 814         .qdev.size  = sizeof(VirtIOPCIProxy),
 815         .init       = virtio_net_init_pci,
 816         .exit       = virtio_net_exit_pci,
 817         .romfile    = "pxe-virtio.rom",
 818         .vendor_id  = PCI_VENDOR_ID_REDHAT_QUMRANET,
 819         .device_id  = PCI_DEVICE_ID_VIRTIO_NET,
 820         .revision   = VIRTIO_PCI_ABI_VERSION,
 821         .class_id   = PCI_CLASS_NETWORK_ETHERNET,
 822         .qdev.props = (Property[]) {
 823             DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
 824                             VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, false),
 825             DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 3),
 826             DEFINE_VIRTIO_NET_FEATURES(VirtIOPCIProxy, host_features),
 827             DEFINE_NIC_PROPERTIES(VirtIOPCIProxy, nic),
 828             DEFINE_PROP_UINT32("x-txtimer", VirtIOPCIProxy,
 829                                net.txtimer, TX_TIMER_INTERVAL),
 830             DEFINE_PROP_INT32("x-txburst", VirtIOPCIProxy,
 831                               net.txburst, TX_BURST),
 832             DEFINE_PROP_STRING("tx", VirtIOPCIProxy, net.tx),
 833             DEFINE_PROP_END_OF_LIST(),
 834         },
 835         .qdev.reset = virtio_pci_reset,
 836     },{
 837         .qdev.name = "virtio-serial-pci",
 838         .qdev.alias = "virtio-serial",
 839         .qdev.size = sizeof(VirtIOPCIProxy),
 840         .init      = virtio_serial_init_pci,
 841         .exit      = virtio_serial_exit_pci,
 842         .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
 843         .device_id = PCI_DEVICE_ID_VIRTIO_CONSOLE,
 844         .revision  = VIRTIO_PCI_ABI_VERSION,
 845         .class_id  = PCI_CLASS_COMMUNICATION_OTHER,
 846         .qdev.props = (Property[]) {
 847             DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
 848                             VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
 849             DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
 850                                DEV_NVECTORS_UNSPECIFIED),
 851             DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
 852             DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
 853             DEFINE_PROP_UINT32("max_ports", VirtIOPCIProxy,
 854                                serial.max_virtserial_ports, 31),
 855             DEFINE_PROP_END_OF_LIST(),
 856         },
 857         .qdev.reset = virtio_pci_reset,
 858     },{
 859         .qdev.name = "virtio-balloon-pci",
 860         .qdev.alias = "virtio-balloon",
 861         .qdev.size = sizeof(VirtIOPCIProxy),
 862         .init      = virtio_balloon_init_pci,
 863         .exit      = virtio_balloon_exit_pci,
 864         .vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
 865         .device_id = PCI_DEVICE_ID_VIRTIO_BALLOON,
 866         .revision  = VIRTIO_PCI_ABI_VERSION,
 867         .class_id  = PCI_CLASS_MEMORY_RAM,
 868         .qdev.props = (Property[]) {
 869             DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
 870             DEFINE_PROP_END_OF_LIST(),
 871         },
 872         .qdev.reset = virtio_pci_reset,
 873     },{
 874         /* end of list */
 875     }
 876 };
 877
 878 static void virtio_pci_register_devices(void)
 879 {
 880     pci_qdev_register_many(virtio_info);
 881 }
 882
 883 device_init(virtio_pci_register_devices)