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 "qemu/osdep.h" 19 20 #include "exec/memop.h" 21 #include "standard-headers/linux/virtio_pci.h" 22 #include "standard-headers/linux/virtio_ids.h" 23 #include "hw/boards.h" 24 #include "hw/virtio/virtio.h" 25 #include "migration/qemu-file-types.h" 26 #include "hw/pci/pci.h" 27 #include "hw/pci/pci_bus.h" 28 #include "hw/qdev-properties.h" 29 #include "qapi/error.h" 30 #include "qemu/error-report.h" 31 #include "qemu/log.h" 32 #include "qemu/module.h" 33 #include "hw/pci/msi.h" 34 #include "hw/pci/msix.h" 35 #include "hw/loader.h" 36 #include "sysemu/kvm.h" 37 #include "hw/virtio/virtio-pci.h" 38 #include "qemu/range.h" 39 #include "hw/virtio/virtio-bus.h" 40 #include "qapi/visitor.h" 41 #include "sysemu/replay.h" 42 #include "trace.h" 43 44 #define VIRTIO_PCI_REGION_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_present(dev)) 45 46 #undef VIRTIO_PCI_CONFIG 47 48 /* The remaining space is defined by each driver as the per-driver 49 * configuration space */ 50 #define VIRTIO_PCI_CONFIG_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_enabled(dev)) 51 52 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size, 53 VirtIOPCIProxy *dev); 54 static void virtio_pci_reset(DeviceState *qdev); 55 56 /* virtio device */ 57 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */ 58 static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d) 59 { 60 return container_of(d, VirtIOPCIProxy, pci_dev.qdev); 61 } 62 63 /* DeviceState to VirtIOPCIProxy. Note: used on datapath, 64 * be careful and test performance if you change this. 65 */ 66 static inline VirtIOPCIProxy *to_virtio_pci_proxy_fast(DeviceState *d) 67 { 68 return container_of(d, VirtIOPCIProxy, pci_dev.qdev); 69 } 70 71 static void virtio_pci_notify(DeviceState *d, uint16_t vector) 72 { 73 VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(d); 74 75 if (msix_enabled(&proxy->pci_dev)) { 76 if (vector != VIRTIO_NO_VECTOR) { 77 msix_notify(&proxy->pci_dev, vector); 78 } 79 } else { 80 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 81 pci_set_irq(&proxy->pci_dev, qatomic_read(&vdev->isr) & 1); 82 } 83 } 84 85 static void virtio_pci_save_config(DeviceState *d, QEMUFile *f) 86 { 87 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 88 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 89 90 pci_device_save(&proxy->pci_dev, f); 91 msix_save(&proxy->pci_dev, f); 92 if (msix_present(&proxy->pci_dev)) 93 qemu_put_be16(f, vdev->config_vector); 94 } 95 96 static const VMStateDescription vmstate_virtio_pci_modern_queue_state = { 97 .name = "virtio_pci/modern_queue_state", 98 .version_id = 1, 99 .minimum_version_id = 1, 100 .fields = (VMStateField[]) { 101 VMSTATE_UINT16(num, VirtIOPCIQueue), 102 VMSTATE_UNUSED(1), /* enabled was stored as be16 */ 103 VMSTATE_BOOL(enabled, VirtIOPCIQueue), 104 VMSTATE_UINT32_ARRAY(desc, VirtIOPCIQueue, 2), 105 VMSTATE_UINT32_ARRAY(avail, VirtIOPCIQueue, 2), 106 VMSTATE_UINT32_ARRAY(used, VirtIOPCIQueue, 2), 107 VMSTATE_END_OF_LIST() 108 } 109 }; 110 111 static bool virtio_pci_modern_state_needed(void *opaque) 112 { 113 VirtIOPCIProxy *proxy = opaque; 114 115 return virtio_pci_modern(proxy); 116 } 117 118 static const VMStateDescription vmstate_virtio_pci_modern_state_sub = { 119 .name = "virtio_pci/modern_state", 120 .version_id = 1, 121 .minimum_version_id = 1, 122 .needed = &virtio_pci_modern_state_needed, 123 .fields = (VMStateField[]) { 124 VMSTATE_UINT32(dfselect, VirtIOPCIProxy), 125 VMSTATE_UINT32(gfselect, VirtIOPCIProxy), 126 VMSTATE_UINT32_ARRAY(guest_features, VirtIOPCIProxy, 2), 127 VMSTATE_STRUCT_ARRAY(vqs, VirtIOPCIProxy, VIRTIO_QUEUE_MAX, 0, 128 vmstate_virtio_pci_modern_queue_state, 129 VirtIOPCIQueue), 130 VMSTATE_END_OF_LIST() 131 } 132 }; 133 134 static const VMStateDescription vmstate_virtio_pci = { 135 .name = "virtio_pci", 136 .version_id = 1, 137 .minimum_version_id = 1, 138 .fields = (VMStateField[]) { 139 VMSTATE_END_OF_LIST() 140 }, 141 .subsections = (const VMStateDescription*[]) { 142 &vmstate_virtio_pci_modern_state_sub, 143 NULL 144 } 145 }; 146 147 static bool virtio_pci_has_extra_state(DeviceState *d) 148 { 149 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 150 151 return proxy->flags & VIRTIO_PCI_FLAG_MIGRATE_EXTRA; 152 } 153 154 static void virtio_pci_save_extra_state(DeviceState *d, QEMUFile *f) 155 { 156 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 157 158 vmstate_save_state(f, &vmstate_virtio_pci, proxy, NULL); 159 } 160 161 static int virtio_pci_load_extra_state(DeviceState *d, QEMUFile *f) 162 { 163 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 164 165 return vmstate_load_state(f, &vmstate_virtio_pci, proxy, 1); 166 } 167 168 static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f) 169 { 170 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 171 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 172 173 if (msix_present(&proxy->pci_dev)) 174 qemu_put_be16(f, virtio_queue_vector(vdev, n)); 175 } 176 177 static int virtio_pci_load_config(DeviceState *d, QEMUFile *f) 178 { 179 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 180 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 181 uint16_t vector; 182 183 int ret; 184 ret = pci_device_load(&proxy->pci_dev, f); 185 if (ret) { 186 return ret; 187 } 188 msix_unuse_all_vectors(&proxy->pci_dev); 189 msix_load(&proxy->pci_dev, f); 190 if (msix_present(&proxy->pci_dev)) { 191 qemu_get_be16s(f, &vector); 192 193 if (vector != VIRTIO_NO_VECTOR && vector >= proxy->nvectors) { 194 return -EINVAL; 195 } 196 } else { 197 vector = VIRTIO_NO_VECTOR; 198 } 199 vdev->config_vector = vector; 200 if (vector != VIRTIO_NO_VECTOR) { 201 msix_vector_use(&proxy->pci_dev, vector); 202 } 203 return 0; 204 } 205 206 static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f) 207 { 208 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 209 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 210 211 uint16_t vector; 212 if (msix_present(&proxy->pci_dev)) { 213 qemu_get_be16s(f, &vector); 214 if (vector != VIRTIO_NO_VECTOR && vector >= proxy->nvectors) { 215 return -EINVAL; 216 } 217 } else { 218 vector = VIRTIO_NO_VECTOR; 219 } 220 virtio_queue_set_vector(vdev, n, vector); 221 if (vector != VIRTIO_NO_VECTOR) { 222 msix_vector_use(&proxy->pci_dev, vector); 223 } 224 225 return 0; 226 } 227 228 typedef struct VirtIOPCIIDInfo { 229 /* virtio id */ 230 uint16_t vdev_id; 231 /* pci device id for the transitional device */ 232 uint16_t trans_devid; 233 uint16_t class_id; 234 } VirtIOPCIIDInfo; 235 236 static const VirtIOPCIIDInfo virtio_pci_id_info[] = { 237 { 238 .vdev_id = VIRTIO_ID_CRYPTO, 239 .class_id = PCI_CLASS_OTHERS, 240 }, { 241 .vdev_id = VIRTIO_ID_FS, 242 .class_id = PCI_CLASS_STORAGE_OTHER, 243 }, { 244 .vdev_id = VIRTIO_ID_NET, 245 .trans_devid = PCI_DEVICE_ID_VIRTIO_NET, 246 .class_id = PCI_CLASS_NETWORK_ETHERNET, 247 }, { 248 .vdev_id = VIRTIO_ID_BLOCK, 249 .trans_devid = PCI_DEVICE_ID_VIRTIO_BLOCK, 250 .class_id = PCI_CLASS_STORAGE_SCSI, 251 }, { 252 .vdev_id = VIRTIO_ID_CONSOLE, 253 .trans_devid = PCI_DEVICE_ID_VIRTIO_CONSOLE, 254 .class_id = PCI_CLASS_COMMUNICATION_OTHER, 255 }, { 256 .vdev_id = VIRTIO_ID_SCSI, 257 .trans_devid = PCI_DEVICE_ID_VIRTIO_SCSI, 258 .class_id = PCI_CLASS_STORAGE_SCSI 259 }, { 260 .vdev_id = VIRTIO_ID_9P, 261 .trans_devid = PCI_DEVICE_ID_VIRTIO_9P, 262 .class_id = PCI_BASE_CLASS_NETWORK, 263 }, { 264 .vdev_id = VIRTIO_ID_BALLOON, 265 .trans_devid = PCI_DEVICE_ID_VIRTIO_BALLOON, 266 .class_id = PCI_CLASS_OTHERS, 267 }, { 268 .vdev_id = VIRTIO_ID_RNG, 269 .trans_devid = PCI_DEVICE_ID_VIRTIO_RNG, 270 .class_id = PCI_CLASS_OTHERS, 271 }, 272 }; 273 274 static const VirtIOPCIIDInfo *virtio_pci_get_id_info(uint16_t vdev_id) 275 { 276 const VirtIOPCIIDInfo *info = NULL; 277 int i; 278 279 for (i = 0; i < ARRAY_SIZE(virtio_pci_id_info); i++) { 280 if (virtio_pci_id_info[i].vdev_id == vdev_id) { 281 info = &virtio_pci_id_info[i]; 282 break; 283 } 284 } 285 286 if (!info) { 287 /* The device id is invalid or not added to the id_info yet. */ 288 error_report("Invalid virtio device(id %u)", vdev_id); 289 abort(); 290 } 291 292 return info; 293 } 294 295 /* 296 * Get the Transitional Device ID for the specific device, return 297 * zero if the device is non-transitional. 298 */ 299 uint16_t virtio_pci_get_trans_devid(uint16_t device_id) 300 { 301 return virtio_pci_get_id_info(device_id)->trans_devid; 302 } 303 304 /* 305 * Get the Class ID for the specific device. 306 */ 307 uint16_t virtio_pci_get_class_id(uint16_t device_id) 308 { 309 return virtio_pci_get_id_info(device_id)->class_id; 310 } 311 312 static bool virtio_pci_ioeventfd_enabled(DeviceState *d) 313 { 314 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 315 316 return (proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) != 0; 317 } 318 319 #define QEMU_VIRTIO_PCI_QUEUE_MEM_MULT 0x1000 320 321 static inline int virtio_pci_queue_mem_mult(struct VirtIOPCIProxy *proxy) 322 { 323 return (proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ) ? 324 QEMU_VIRTIO_PCI_QUEUE_MEM_MULT : 4; 325 } 326 327 static int virtio_pci_ioeventfd_assign(DeviceState *d, EventNotifier *notifier, 328 int n, bool assign) 329 { 330 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 331 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 332 VirtQueue *vq = virtio_get_queue(vdev, n); 333 bool legacy = virtio_pci_legacy(proxy); 334 bool modern = virtio_pci_modern(proxy); 335 bool fast_mmio = kvm_ioeventfd_any_length_enabled(); 336 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 337 MemoryRegion *modern_mr = &proxy->notify.mr; 338 MemoryRegion *modern_notify_mr = &proxy->notify_pio.mr; 339 MemoryRegion *legacy_mr = &proxy->bar; 340 hwaddr modern_addr = virtio_pci_queue_mem_mult(proxy) * 341 virtio_get_queue_index(vq); 342 hwaddr legacy_addr = VIRTIO_PCI_QUEUE_NOTIFY; 343 344 if (assign) { 345 if (modern) { 346 if (fast_mmio) { 347 memory_region_add_eventfd(modern_mr, modern_addr, 0, 348 false, n, notifier); 349 } else { 350 memory_region_add_eventfd(modern_mr, modern_addr, 2, 351 false, n, notifier); 352 } 353 if (modern_pio) { 354 memory_region_add_eventfd(modern_notify_mr, 0, 2, 355 true, n, notifier); 356 } 357 } 358 if (legacy) { 359 memory_region_add_eventfd(legacy_mr, legacy_addr, 2, 360 true, n, notifier); 361 } 362 } else { 363 if (modern) { 364 if (fast_mmio) { 365 memory_region_del_eventfd(modern_mr, modern_addr, 0, 366 false, n, notifier); 367 } else { 368 memory_region_del_eventfd(modern_mr, modern_addr, 2, 369 false, n, notifier); 370 } 371 if (modern_pio) { 372 memory_region_del_eventfd(modern_notify_mr, 0, 2, 373 true, n, notifier); 374 } 375 } 376 if (legacy) { 377 memory_region_del_eventfd(legacy_mr, legacy_addr, 2, 378 true, n, notifier); 379 } 380 } 381 return 0; 382 } 383 384 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy) 385 { 386 virtio_bus_start_ioeventfd(&proxy->bus); 387 } 388 389 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy) 390 { 391 virtio_bus_stop_ioeventfd(&proxy->bus); 392 } 393 394 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) 395 { 396 VirtIOPCIProxy *proxy = opaque; 397 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 398 uint16_t vector; 399 hwaddr pa; 400 401 switch (addr) { 402 case VIRTIO_PCI_GUEST_FEATURES: 403 /* Guest does not negotiate properly? We have to assume nothing. */ 404 if (val & (1 << VIRTIO_F_BAD_FEATURE)) { 405 val = virtio_bus_get_vdev_bad_features(&proxy->bus); 406 } 407 virtio_set_features(vdev, val); 408 break; 409 case VIRTIO_PCI_QUEUE_PFN: 410 pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT; 411 if (pa == 0) { 412 virtio_pci_reset(DEVICE(proxy)); 413 } 414 else 415 virtio_queue_set_addr(vdev, vdev->queue_sel, pa); 416 break; 417 case VIRTIO_PCI_QUEUE_SEL: 418 if (val < VIRTIO_QUEUE_MAX) 419 vdev->queue_sel = val; 420 break; 421 case VIRTIO_PCI_QUEUE_NOTIFY: 422 if (val < VIRTIO_QUEUE_MAX) { 423 virtio_queue_notify(vdev, val); 424 } 425 break; 426 case VIRTIO_PCI_STATUS: 427 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) { 428 virtio_pci_stop_ioeventfd(proxy); 429 } 430 431 virtio_set_status(vdev, val & 0xFF); 432 433 if (val & VIRTIO_CONFIG_S_DRIVER_OK) { 434 virtio_pci_start_ioeventfd(proxy); 435 } 436 437 if (vdev->status == 0) { 438 virtio_pci_reset(DEVICE(proxy)); 439 } 440 441 /* Linux before 2.6.34 drives the device without enabling 442 the PCI device bus master bit. Enable it automatically 443 for the guest. This is a PCI spec violation but so is 444 initiating DMA with bus master bit clear. */ 445 if (val == (VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER)) { 446 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND, 447 proxy->pci_dev.config[PCI_COMMAND] | 448 PCI_COMMAND_MASTER, 1); 449 } 450 break; 451 case VIRTIO_MSI_CONFIG_VECTOR: 452 if (vdev->config_vector != VIRTIO_NO_VECTOR) { 453 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector); 454 } 455 /* Make it possible for guest to discover an error took place. */ 456 if (val < proxy->nvectors) { 457 msix_vector_use(&proxy->pci_dev, val); 458 } else { 459 val = VIRTIO_NO_VECTOR; 460 } 461 vdev->config_vector = val; 462 break; 463 case VIRTIO_MSI_QUEUE_VECTOR: 464 vector = virtio_queue_vector(vdev, vdev->queue_sel); 465 if (vector != VIRTIO_NO_VECTOR) { 466 msix_vector_unuse(&proxy->pci_dev, vector); 467 } 468 /* Make it possible for guest to discover an error took place. */ 469 if (val < proxy->nvectors) { 470 msix_vector_use(&proxy->pci_dev, val); 471 } else { 472 val = VIRTIO_NO_VECTOR; 473 } 474 virtio_queue_set_vector(vdev, vdev->queue_sel, val); 475 break; 476 default: 477 qemu_log_mask(LOG_GUEST_ERROR, 478 "%s: unexpected address 0x%x value 0x%x\n", 479 __func__, addr, val); 480 break; 481 } 482 } 483 484 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr) 485 { 486 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 487 uint32_t ret = 0xFFFFFFFF; 488 489 switch (addr) { 490 case VIRTIO_PCI_HOST_FEATURES: 491 ret = vdev->host_features; 492 break; 493 case VIRTIO_PCI_GUEST_FEATURES: 494 ret = vdev->guest_features; 495 break; 496 case VIRTIO_PCI_QUEUE_PFN: 497 ret = virtio_queue_get_addr(vdev, vdev->queue_sel) 498 >> VIRTIO_PCI_QUEUE_ADDR_SHIFT; 499 break; 500 case VIRTIO_PCI_QUEUE_NUM: 501 ret = virtio_queue_get_num(vdev, vdev->queue_sel); 502 break; 503 case VIRTIO_PCI_QUEUE_SEL: 504 ret = vdev->queue_sel; 505 break; 506 case VIRTIO_PCI_STATUS: 507 ret = vdev->status; 508 break; 509 case VIRTIO_PCI_ISR: 510 /* reading from the ISR also clears it. */ 511 ret = qatomic_xchg(&vdev->isr, 0); 512 pci_irq_deassert(&proxy->pci_dev); 513 break; 514 case VIRTIO_MSI_CONFIG_VECTOR: 515 ret = vdev->config_vector; 516 break; 517 case VIRTIO_MSI_QUEUE_VECTOR: 518 ret = virtio_queue_vector(vdev, vdev->queue_sel); 519 break; 520 default: 521 break; 522 } 523 524 return ret; 525 } 526 527 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr, 528 unsigned size) 529 { 530 VirtIOPCIProxy *proxy = opaque; 531 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 532 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev); 533 uint64_t val = 0; 534 535 if (vdev == NULL) { 536 return UINT64_MAX; 537 } 538 539 if (addr < config) { 540 return virtio_ioport_read(proxy, addr); 541 } 542 addr -= config; 543 544 switch (size) { 545 case 1: 546 val = virtio_config_readb(vdev, addr); 547 break; 548 case 2: 549 val = virtio_config_readw(vdev, addr); 550 if (virtio_is_big_endian(vdev)) { 551 val = bswap16(val); 552 } 553 break; 554 case 4: 555 val = virtio_config_readl(vdev, addr); 556 if (virtio_is_big_endian(vdev)) { 557 val = bswap32(val); 558 } 559 break; 560 } 561 return val; 562 } 563 564 static void virtio_pci_config_write(void *opaque, hwaddr addr, 565 uint64_t val, unsigned size) 566 { 567 VirtIOPCIProxy *proxy = opaque; 568 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev); 569 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 570 571 if (vdev == NULL) { 572 return; 573 } 574 575 if (addr < config) { 576 virtio_ioport_write(proxy, addr, val); 577 return; 578 } 579 addr -= config; 580 /* 581 * Virtio-PCI is odd. Ioports are LE but config space is target native 582 * endian. 583 */ 584 switch (size) { 585 case 1: 586 virtio_config_writeb(vdev, addr, val); 587 break; 588 case 2: 589 if (virtio_is_big_endian(vdev)) { 590 val = bswap16(val); 591 } 592 virtio_config_writew(vdev, addr, val); 593 break; 594 case 4: 595 if (virtio_is_big_endian(vdev)) { 596 val = bswap32(val); 597 } 598 virtio_config_writel(vdev, addr, val); 599 break; 600 } 601 } 602 603 static const MemoryRegionOps virtio_pci_config_ops = { 604 .read = virtio_pci_config_read, 605 .write = virtio_pci_config_write, 606 .impl = { 607 .min_access_size = 1, 608 .max_access_size = 4, 609 }, 610 .endianness = DEVICE_LITTLE_ENDIAN, 611 }; 612 613 static MemoryRegion *virtio_address_space_lookup(VirtIOPCIProxy *proxy, 614 hwaddr *off, int len) 615 { 616 int i; 617 VirtIOPCIRegion *reg; 618 619 for (i = 0; i < ARRAY_SIZE(proxy->regs); ++i) { 620 reg = &proxy->regs[i]; 621 if (*off >= reg->offset && 622 *off + len <= reg->offset + reg->size) { 623 *off -= reg->offset; 624 return ®->mr; 625 } 626 } 627 628 return NULL; 629 } 630 631 /* Below are generic functions to do memcpy from/to an address space, 632 * without byteswaps, with input validation. 633 * 634 * As regular address_space_* APIs all do some kind of byteswap at least for 635 * some host/target combinations, we are forced to explicitly convert to a 636 * known-endianness integer value. 637 * It doesn't really matter which endian format to go through, so the code 638 * below selects the endian that causes the least amount of work on the given 639 * host. 640 * 641 * Note: host pointer must be aligned. 642 */ 643 static 644 void virtio_address_space_write(VirtIOPCIProxy *proxy, hwaddr addr, 645 const uint8_t *buf, int len) 646 { 647 uint64_t val; 648 MemoryRegion *mr; 649 650 /* address_space_* APIs assume an aligned address. 651 * As address is under guest control, handle illegal values. 652 */ 653 addr &= ~(len - 1); 654 655 mr = virtio_address_space_lookup(proxy, &addr, len); 656 if (!mr) { 657 return; 658 } 659 660 /* Make sure caller aligned buf properly */ 661 assert(!(((uintptr_t)buf) & (len - 1))); 662 663 switch (len) { 664 case 1: 665 val = pci_get_byte(buf); 666 break; 667 case 2: 668 val = pci_get_word(buf); 669 break; 670 case 4: 671 val = pci_get_long(buf); 672 break; 673 default: 674 /* As length is under guest control, handle illegal values. */ 675 return; 676 } 677 memory_region_dispatch_write(mr, addr, val, size_memop(len) | MO_LE, 678 MEMTXATTRS_UNSPECIFIED); 679 } 680 681 static void 682 virtio_address_space_read(VirtIOPCIProxy *proxy, hwaddr addr, 683 uint8_t *buf, int len) 684 { 685 uint64_t val; 686 MemoryRegion *mr; 687 688 /* address_space_* APIs assume an aligned address. 689 * As address is under guest control, handle illegal values. 690 */ 691 addr &= ~(len - 1); 692 693 mr = virtio_address_space_lookup(proxy, &addr, len); 694 if (!mr) { 695 return; 696 } 697 698 /* Make sure caller aligned buf properly */ 699 assert(!(((uintptr_t)buf) & (len - 1))); 700 701 memory_region_dispatch_read(mr, addr, &val, size_memop(len) | MO_LE, 702 MEMTXATTRS_UNSPECIFIED); 703 switch (len) { 704 case 1: 705 pci_set_byte(buf, val); 706 break; 707 case 2: 708 pci_set_word(buf, val); 709 break; 710 case 4: 711 pci_set_long(buf, val); 712 break; 713 default: 714 /* As length is under guest control, handle illegal values. */ 715 break; 716 } 717 } 718 719 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address, 720 uint32_t val, int len) 721 { 722 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 723 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 724 struct virtio_pci_cfg_cap *cfg; 725 726 pci_default_write_config(pci_dev, address, val, len); 727 728 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) { 729 pcie_cap_flr_write_config(pci_dev, address, val, len); 730 } 731 732 if (range_covers_byte(address, len, PCI_COMMAND)) { 733 if (!(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) { 734 virtio_set_disabled(vdev, true); 735 virtio_pci_stop_ioeventfd(proxy); 736 virtio_set_status(vdev, vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK); 737 } else { 738 virtio_set_disabled(vdev, false); 739 } 740 } 741 742 if (proxy->config_cap && 743 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap, 744 pci_cfg_data), 745 sizeof cfg->pci_cfg_data)) { 746 uint32_t off; 747 uint32_t len; 748 749 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap); 750 off = le32_to_cpu(cfg->cap.offset); 751 len = le32_to_cpu(cfg->cap.length); 752 753 if (len == 1 || len == 2 || len == 4) { 754 assert(len <= sizeof cfg->pci_cfg_data); 755 virtio_address_space_write(proxy, off, cfg->pci_cfg_data, len); 756 } 757 } 758 } 759 760 static uint32_t virtio_read_config(PCIDevice *pci_dev, 761 uint32_t address, int len) 762 { 763 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 764 struct virtio_pci_cfg_cap *cfg; 765 766 if (proxy->config_cap && 767 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap, 768 pci_cfg_data), 769 sizeof cfg->pci_cfg_data)) { 770 uint32_t off; 771 uint32_t len; 772 773 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap); 774 off = le32_to_cpu(cfg->cap.offset); 775 len = le32_to_cpu(cfg->cap.length); 776 777 if (len == 1 || len == 2 || len == 4) { 778 assert(len <= sizeof cfg->pci_cfg_data); 779 virtio_address_space_read(proxy, off, cfg->pci_cfg_data, len); 780 } 781 } 782 783 return pci_default_read_config(pci_dev, address, len); 784 } 785 786 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy, 787 unsigned int vector) 788 { 789 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 790 int ret; 791 792 if (irqfd->users == 0) { 793 KVMRouteChange c = kvm_irqchip_begin_route_changes(kvm_state); 794 ret = kvm_irqchip_add_msi_route(&c, vector, &proxy->pci_dev); 795 if (ret < 0) { 796 return ret; 797 } 798 kvm_irqchip_commit_route_changes(&c); 799 irqfd->virq = ret; 800 } 801 irqfd->users++; 802 return 0; 803 } 804 805 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy, 806 unsigned int vector) 807 { 808 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 809 if (--irqfd->users == 0) { 810 kvm_irqchip_release_virq(kvm_state, irqfd->virq); 811 } 812 } 813 814 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy, 815 EventNotifier *n, 816 unsigned int vector) 817 { 818 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 819 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq); 820 } 821 822 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy, 823 EventNotifier *n , 824 unsigned int vector) 825 { 826 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 827 int ret; 828 829 ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, irqfd->virq); 830 assert(ret == 0); 831 } 832 static int virtio_pci_get_notifier(VirtIOPCIProxy *proxy, int queue_no, 833 EventNotifier **n, unsigned int *vector) 834 { 835 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 836 VirtQueue *vq; 837 838 if (queue_no == VIRTIO_CONFIG_IRQ_IDX) { 839 *n = virtio_config_get_guest_notifier(vdev); 840 *vector = vdev->config_vector; 841 } else { 842 if (!virtio_queue_get_num(vdev, queue_no)) { 843 return -1; 844 } 845 *vector = virtio_queue_vector(vdev, queue_no); 846 vq = virtio_get_queue(vdev, queue_no); 847 *n = virtio_queue_get_guest_notifier(vq); 848 } 849 return 0; 850 } 851 852 static int kvm_virtio_pci_vector_use_one(VirtIOPCIProxy *proxy, int queue_no) 853 { 854 unsigned int vector; 855 int ret; 856 EventNotifier *n; 857 PCIDevice *dev = &proxy->pci_dev; 858 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 859 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 860 861 ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); 862 if (ret < 0) { 863 return ret; 864 } 865 if (vector >= msix_nr_vectors_allocated(dev)) { 866 return 0; 867 } 868 ret = kvm_virtio_pci_vq_vector_use(proxy, vector); 869 if (ret < 0) { 870 goto undo; 871 } 872 /* 873 * If guest supports masking, set up irqfd now. 874 * Otherwise, delay until unmasked in the frontend. 875 */ 876 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 877 ret = kvm_virtio_pci_irqfd_use(proxy, n, vector); 878 if (ret < 0) { 879 kvm_virtio_pci_vq_vector_release(proxy, vector); 880 goto undo; 881 } 882 } 883 884 return 0; 885 undo: 886 887 vector = virtio_queue_vector(vdev, queue_no); 888 if (vector >= msix_nr_vectors_allocated(dev)) { 889 return ret; 890 } 891 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 892 ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); 893 if (ret < 0) { 894 return ret; 895 } 896 kvm_virtio_pci_irqfd_release(proxy, n, vector); 897 } 898 return ret; 899 } 900 static int kvm_virtio_pci_vector_vq_use(VirtIOPCIProxy *proxy, int nvqs) 901 { 902 int queue_no; 903 int ret = 0; 904 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 905 906 for (queue_no = 0; queue_no < nvqs; queue_no++) { 907 if (!virtio_queue_get_num(vdev, queue_no)) { 908 return -1; 909 } 910 ret = kvm_virtio_pci_vector_use_one(proxy, queue_no); 911 } 912 return ret; 913 } 914 915 static int kvm_virtio_pci_vector_config_use(VirtIOPCIProxy *proxy) 916 { 917 return kvm_virtio_pci_vector_use_one(proxy, VIRTIO_CONFIG_IRQ_IDX); 918 } 919 920 static void kvm_virtio_pci_vector_release_one(VirtIOPCIProxy *proxy, 921 int queue_no) 922 { 923 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 924 unsigned int vector; 925 EventNotifier *n; 926 int ret; 927 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 928 PCIDevice *dev = &proxy->pci_dev; 929 930 ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); 931 if (ret < 0) { 932 return; 933 } 934 if (vector >= msix_nr_vectors_allocated(dev)) { 935 return; 936 } 937 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 938 kvm_virtio_pci_irqfd_release(proxy, n, vector); 939 } 940 kvm_virtio_pci_vq_vector_release(proxy, vector); 941 } 942 943 static void kvm_virtio_pci_vector_vq_release(VirtIOPCIProxy *proxy, int nvqs) 944 { 945 int queue_no; 946 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 947 948 for (queue_no = 0; queue_no < nvqs; queue_no++) { 949 if (!virtio_queue_get_num(vdev, queue_no)) { 950 break; 951 } 952 kvm_virtio_pci_vector_release_one(proxy, queue_no); 953 } 954 } 955 956 static void kvm_virtio_pci_vector_config_release(VirtIOPCIProxy *proxy) 957 { 958 kvm_virtio_pci_vector_release_one(proxy, VIRTIO_CONFIG_IRQ_IDX); 959 } 960 961 static int virtio_pci_one_vector_unmask(VirtIOPCIProxy *proxy, 962 unsigned int queue_no, 963 unsigned int vector, 964 MSIMessage msg, 965 EventNotifier *n) 966 { 967 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 968 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 969 VirtIOIRQFD *irqfd; 970 int ret = 0; 971 972 if (proxy->vector_irqfd) { 973 irqfd = &proxy->vector_irqfd[vector]; 974 if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) { 975 ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg, 976 &proxy->pci_dev); 977 if (ret < 0) { 978 return ret; 979 } 980 kvm_irqchip_commit_routes(kvm_state); 981 } 982 } 983 984 /* If guest supports masking, irqfd is already setup, unmask it. 985 * Otherwise, set it up now. 986 */ 987 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 988 k->guest_notifier_mask(vdev, queue_no, false); 989 /* Test after unmasking to avoid losing events. */ 990 if (k->guest_notifier_pending && 991 k->guest_notifier_pending(vdev, queue_no)) { 992 event_notifier_set(n); 993 } 994 } else { 995 ret = kvm_virtio_pci_irqfd_use(proxy, n, vector); 996 } 997 return ret; 998 } 999 1000 static void virtio_pci_one_vector_mask(VirtIOPCIProxy *proxy, 1001 unsigned int queue_no, 1002 unsigned int vector, 1003 EventNotifier *n) 1004 { 1005 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1006 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 1007 1008 /* If guest supports masking, keep irqfd but mask it. 1009 * Otherwise, clean it up now. 1010 */ 1011 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 1012 k->guest_notifier_mask(vdev, queue_no, true); 1013 } else { 1014 kvm_virtio_pci_irqfd_release(proxy, n, vector); 1015 } 1016 } 1017 1018 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector, 1019 MSIMessage msg) 1020 { 1021 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 1022 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1023 VirtQueue *vq = virtio_vector_first_queue(vdev, vector); 1024 EventNotifier *n; 1025 int ret, index, unmasked = 0; 1026 1027 while (vq) { 1028 index = virtio_get_queue_index(vq); 1029 if (!virtio_queue_get_num(vdev, index)) { 1030 break; 1031 } 1032 if (index < proxy->nvqs_with_notifiers) { 1033 n = virtio_queue_get_guest_notifier(vq); 1034 ret = virtio_pci_one_vector_unmask(proxy, index, vector, msg, n); 1035 if (ret < 0) { 1036 goto undo; 1037 } 1038 ++unmasked; 1039 } 1040 vq = virtio_vector_next_queue(vq); 1041 } 1042 /* unmask config intr */ 1043 if (vector == vdev->config_vector) { 1044 n = virtio_config_get_guest_notifier(vdev); 1045 ret = virtio_pci_one_vector_unmask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, 1046 msg, n); 1047 if (ret < 0) { 1048 goto undo_config; 1049 } 1050 } 1051 return 0; 1052 undo_config: 1053 n = virtio_config_get_guest_notifier(vdev); 1054 virtio_pci_one_vector_mask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, n); 1055 undo: 1056 vq = virtio_vector_first_queue(vdev, vector); 1057 while (vq && unmasked >= 0) { 1058 index = virtio_get_queue_index(vq); 1059 if (index < proxy->nvqs_with_notifiers) { 1060 n = virtio_queue_get_guest_notifier(vq); 1061 virtio_pci_one_vector_mask(proxy, index, vector, n); 1062 --unmasked; 1063 } 1064 vq = virtio_vector_next_queue(vq); 1065 } 1066 return ret; 1067 } 1068 1069 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector) 1070 { 1071 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 1072 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1073 VirtQueue *vq = virtio_vector_first_queue(vdev, vector); 1074 EventNotifier *n; 1075 int index; 1076 1077 while (vq) { 1078 index = virtio_get_queue_index(vq); 1079 n = virtio_queue_get_guest_notifier(vq); 1080 if (!virtio_queue_get_num(vdev, index)) { 1081 break; 1082 } 1083 if (index < proxy->nvqs_with_notifiers) { 1084 virtio_pci_one_vector_mask(proxy, index, vector, n); 1085 } 1086 vq = virtio_vector_next_queue(vq); 1087 } 1088 1089 if (vector == vdev->config_vector) { 1090 n = virtio_config_get_guest_notifier(vdev); 1091 virtio_pci_one_vector_mask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, n); 1092 } 1093 } 1094 1095 static void virtio_pci_vector_poll(PCIDevice *dev, 1096 unsigned int vector_start, 1097 unsigned int vector_end) 1098 { 1099 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 1100 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1101 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 1102 int queue_no; 1103 unsigned int vector; 1104 EventNotifier *notifier; 1105 int ret; 1106 1107 for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) { 1108 ret = virtio_pci_get_notifier(proxy, queue_no, ¬ifier, &vector); 1109 if (ret < 0) { 1110 break; 1111 } 1112 if (vector < vector_start || vector >= vector_end || 1113 !msix_is_masked(dev, vector)) { 1114 continue; 1115 } 1116 if (k->guest_notifier_pending) { 1117 if (k->guest_notifier_pending(vdev, queue_no)) { 1118 msix_set_pending(dev, vector); 1119 } 1120 } else if (event_notifier_test_and_clear(notifier)) { 1121 msix_set_pending(dev, vector); 1122 } 1123 } 1124 /* poll the config intr */ 1125 ret = virtio_pci_get_notifier(proxy, VIRTIO_CONFIG_IRQ_IDX, ¬ifier, 1126 &vector); 1127 if (ret < 0) { 1128 return; 1129 } 1130 if (vector < vector_start || vector >= vector_end || 1131 !msix_is_masked(dev, vector)) { 1132 return; 1133 } 1134 if (k->guest_notifier_pending) { 1135 if (k->guest_notifier_pending(vdev, VIRTIO_CONFIG_IRQ_IDX)) { 1136 msix_set_pending(dev, vector); 1137 } 1138 } else if (event_notifier_test_and_clear(notifier)) { 1139 msix_set_pending(dev, vector); 1140 } 1141 } 1142 1143 void virtio_pci_set_guest_notifier_fd_handler(VirtIODevice *vdev, VirtQueue *vq, 1144 int n, bool assign, 1145 bool with_irqfd) 1146 { 1147 if (n == VIRTIO_CONFIG_IRQ_IDX) { 1148 virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd); 1149 } else { 1150 virtio_queue_set_guest_notifier_fd_handler(vq, assign, with_irqfd); 1151 } 1152 } 1153 1154 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign, 1155 bool with_irqfd) 1156 { 1157 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1158 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1159 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 1160 VirtQueue *vq = NULL; 1161 EventNotifier *notifier = NULL; 1162 1163 if (n == VIRTIO_CONFIG_IRQ_IDX) { 1164 notifier = virtio_config_get_guest_notifier(vdev); 1165 } else { 1166 vq = virtio_get_queue(vdev, n); 1167 notifier = virtio_queue_get_guest_notifier(vq); 1168 } 1169 1170 if (assign) { 1171 int r = event_notifier_init(notifier, 0); 1172 if (r < 0) { 1173 return r; 1174 } 1175 virtio_pci_set_guest_notifier_fd_handler(vdev, vq, n, true, with_irqfd); 1176 } else { 1177 virtio_pci_set_guest_notifier_fd_handler(vdev, vq, n, false, 1178 with_irqfd); 1179 event_notifier_cleanup(notifier); 1180 } 1181 1182 if (!msix_enabled(&proxy->pci_dev) && 1183 vdev->use_guest_notifier_mask && 1184 vdc->guest_notifier_mask) { 1185 vdc->guest_notifier_mask(vdev, n, !assign); 1186 } 1187 1188 return 0; 1189 } 1190 1191 static bool virtio_pci_query_guest_notifiers(DeviceState *d) 1192 { 1193 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1194 return msix_enabled(&proxy->pci_dev); 1195 } 1196 1197 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign) 1198 { 1199 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1200 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1201 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 1202 int r, n; 1203 bool with_irqfd = msix_enabled(&proxy->pci_dev) && 1204 kvm_msi_via_irqfd_enabled(); 1205 1206 nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX); 1207 1208 /* 1209 * When deassigning, pass a consistent nvqs value to avoid leaking 1210 * notifiers. But first check we've actually been configured, exit 1211 * early if we haven't. 1212 */ 1213 if (!assign && !proxy->nvqs_with_notifiers) { 1214 return 0; 1215 } 1216 assert(assign || nvqs == proxy->nvqs_with_notifiers); 1217 1218 proxy->nvqs_with_notifiers = nvqs; 1219 1220 /* Must unset vector notifier while guest notifier is still assigned */ 1221 if ((proxy->vector_irqfd || 1222 (vdev->use_guest_notifier_mask && k->guest_notifier_mask)) && 1223 !assign) { 1224 msix_unset_vector_notifiers(&proxy->pci_dev); 1225 if (proxy->vector_irqfd) { 1226 kvm_virtio_pci_vector_vq_release(proxy, nvqs); 1227 kvm_virtio_pci_vector_config_release(proxy); 1228 g_free(proxy->vector_irqfd); 1229 proxy->vector_irqfd = NULL; 1230 } 1231 } 1232 1233 for (n = 0; n < nvqs; n++) { 1234 if (!virtio_queue_get_num(vdev, n)) { 1235 break; 1236 } 1237 1238 r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd); 1239 if (r < 0) { 1240 goto assign_error; 1241 } 1242 } 1243 r = virtio_pci_set_guest_notifier(d, VIRTIO_CONFIG_IRQ_IDX, assign, 1244 with_irqfd); 1245 if (r < 0) { 1246 goto config_assign_error; 1247 } 1248 /* Must set vector notifier after guest notifier has been assigned */ 1249 if ((with_irqfd || 1250 (vdev->use_guest_notifier_mask && k->guest_notifier_mask)) && 1251 assign) { 1252 if (with_irqfd) { 1253 proxy->vector_irqfd = 1254 g_malloc0(sizeof(*proxy->vector_irqfd) * 1255 msix_nr_vectors_allocated(&proxy->pci_dev)); 1256 r = kvm_virtio_pci_vector_vq_use(proxy, nvqs); 1257 if (r < 0) { 1258 goto config_assign_error; 1259 } 1260 r = kvm_virtio_pci_vector_config_use(proxy); 1261 if (r < 0) { 1262 goto config_error; 1263 } 1264 } 1265 1266 r = msix_set_vector_notifiers(&proxy->pci_dev, virtio_pci_vector_unmask, 1267 virtio_pci_vector_mask, 1268 virtio_pci_vector_poll); 1269 if (r < 0) { 1270 goto notifiers_error; 1271 } 1272 } 1273 1274 return 0; 1275 1276 notifiers_error: 1277 if (with_irqfd) { 1278 assert(assign); 1279 kvm_virtio_pci_vector_vq_release(proxy, nvqs); 1280 } 1281 config_error: 1282 if (with_irqfd) { 1283 kvm_virtio_pci_vector_config_release(proxy); 1284 } 1285 config_assign_error: 1286 virtio_pci_set_guest_notifier(d, VIRTIO_CONFIG_IRQ_IDX, !assign, 1287 with_irqfd); 1288 assign_error: 1289 /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */ 1290 assert(assign); 1291 while (--n >= 0) { 1292 virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd); 1293 } 1294 return r; 1295 } 1296 1297 static int virtio_pci_set_host_notifier_mr(DeviceState *d, int n, 1298 MemoryRegion *mr, bool assign) 1299 { 1300 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1301 int offset; 1302 1303 if (n >= VIRTIO_QUEUE_MAX || !virtio_pci_modern(proxy) || 1304 virtio_pci_queue_mem_mult(proxy) != memory_region_size(mr)) { 1305 return -1; 1306 } 1307 1308 if (assign) { 1309 offset = virtio_pci_queue_mem_mult(proxy) * n; 1310 memory_region_add_subregion_overlap(&proxy->notify.mr, offset, mr, 1); 1311 } else { 1312 memory_region_del_subregion(&proxy->notify.mr, mr); 1313 } 1314 1315 return 0; 1316 } 1317 1318 static void virtio_pci_vmstate_change(DeviceState *d, bool running) 1319 { 1320 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1321 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1322 1323 if (running) { 1324 /* Old QEMU versions did not set bus master enable on status write. 1325 * Detect DRIVER set and enable it. 1326 */ 1327 if ((proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION) && 1328 (vdev->status & VIRTIO_CONFIG_S_DRIVER) && 1329 !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) { 1330 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND, 1331 proxy->pci_dev.config[PCI_COMMAND] | 1332 PCI_COMMAND_MASTER, 1); 1333 } 1334 virtio_pci_start_ioeventfd(proxy); 1335 } else { 1336 virtio_pci_stop_ioeventfd(proxy); 1337 } 1338 } 1339 1340 /* 1341 * virtio-pci: This is the PCIDevice which has a virtio-pci-bus. 1342 */ 1343 1344 static int virtio_pci_query_nvectors(DeviceState *d) 1345 { 1346 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1347 1348 return proxy->nvectors; 1349 } 1350 1351 static AddressSpace *virtio_pci_get_dma_as(DeviceState *d) 1352 { 1353 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1354 PCIDevice *dev = &proxy->pci_dev; 1355 1356 return pci_get_address_space(dev); 1357 } 1358 1359 static bool virtio_pci_iommu_enabled(DeviceState *d) 1360 { 1361 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1362 PCIDevice *dev = &proxy->pci_dev; 1363 AddressSpace *dma_as = pci_device_iommu_address_space(dev); 1364 1365 if (dma_as == &address_space_memory) { 1366 return false; 1367 } 1368 1369 return true; 1370 } 1371 1372 static bool virtio_pci_queue_enabled(DeviceState *d, int n) 1373 { 1374 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1375 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1376 1377 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { 1378 return proxy->vqs[n].enabled; 1379 } 1380 1381 return virtio_queue_enabled_legacy(vdev, n); 1382 } 1383 1384 static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy, 1385 struct virtio_pci_cap *cap) 1386 { 1387 PCIDevice *dev = &proxy->pci_dev; 1388 int offset; 1389 1390 offset = pci_add_capability(dev, PCI_CAP_ID_VNDR, 0, 1391 cap->cap_len, &error_abort); 1392 1393 assert(cap->cap_len >= sizeof *cap); 1394 memcpy(dev->config + offset + PCI_CAP_FLAGS, &cap->cap_len, 1395 cap->cap_len - PCI_CAP_FLAGS); 1396 1397 return offset; 1398 } 1399 1400 static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr, 1401 unsigned size) 1402 { 1403 VirtIOPCIProxy *proxy = opaque; 1404 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1405 uint32_t val = 0; 1406 int i; 1407 1408 if (vdev == NULL) { 1409 return UINT64_MAX; 1410 } 1411 1412 switch (addr) { 1413 case VIRTIO_PCI_COMMON_DFSELECT: 1414 val = proxy->dfselect; 1415 break; 1416 case VIRTIO_PCI_COMMON_DF: 1417 if (proxy->dfselect <= 1) { 1418 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 1419 1420 val = (vdev->host_features & ~vdc->legacy_features) >> 1421 (32 * proxy->dfselect); 1422 } 1423 break; 1424 case VIRTIO_PCI_COMMON_GFSELECT: 1425 val = proxy->gfselect; 1426 break; 1427 case VIRTIO_PCI_COMMON_GF: 1428 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) { 1429 val = proxy->guest_features[proxy->gfselect]; 1430 } 1431 break; 1432 case VIRTIO_PCI_COMMON_MSIX: 1433 val = vdev->config_vector; 1434 break; 1435 case VIRTIO_PCI_COMMON_NUMQ: 1436 for (i = 0; i < VIRTIO_QUEUE_MAX; ++i) { 1437 if (virtio_queue_get_num(vdev, i)) { 1438 val = i + 1; 1439 } 1440 } 1441 break; 1442 case VIRTIO_PCI_COMMON_STATUS: 1443 val = vdev->status; 1444 break; 1445 case VIRTIO_PCI_COMMON_CFGGENERATION: 1446 val = vdev->generation; 1447 break; 1448 case VIRTIO_PCI_COMMON_Q_SELECT: 1449 val = vdev->queue_sel; 1450 break; 1451 case VIRTIO_PCI_COMMON_Q_SIZE: 1452 val = virtio_queue_get_num(vdev, vdev->queue_sel); 1453 break; 1454 case VIRTIO_PCI_COMMON_Q_MSIX: 1455 val = virtio_queue_vector(vdev, vdev->queue_sel); 1456 break; 1457 case VIRTIO_PCI_COMMON_Q_ENABLE: 1458 val = proxy->vqs[vdev->queue_sel].enabled; 1459 break; 1460 case VIRTIO_PCI_COMMON_Q_NOFF: 1461 /* Simply map queues in order */ 1462 val = vdev->queue_sel; 1463 break; 1464 case VIRTIO_PCI_COMMON_Q_DESCLO: 1465 val = proxy->vqs[vdev->queue_sel].desc[0]; 1466 break; 1467 case VIRTIO_PCI_COMMON_Q_DESCHI: 1468 val = proxy->vqs[vdev->queue_sel].desc[1]; 1469 break; 1470 case VIRTIO_PCI_COMMON_Q_AVAILLO: 1471 val = proxy->vqs[vdev->queue_sel].avail[0]; 1472 break; 1473 case VIRTIO_PCI_COMMON_Q_AVAILHI: 1474 val = proxy->vqs[vdev->queue_sel].avail[1]; 1475 break; 1476 case VIRTIO_PCI_COMMON_Q_USEDLO: 1477 val = proxy->vqs[vdev->queue_sel].used[0]; 1478 break; 1479 case VIRTIO_PCI_COMMON_Q_USEDHI: 1480 val = proxy->vqs[vdev->queue_sel].used[1]; 1481 break; 1482 case VIRTIO_PCI_COMMON_Q_RESET: 1483 val = proxy->vqs[vdev->queue_sel].reset; 1484 break; 1485 default: 1486 val = 0; 1487 } 1488 1489 return val; 1490 } 1491 1492 static void virtio_pci_common_write(void *opaque, hwaddr addr, 1493 uint64_t val, unsigned size) 1494 { 1495 VirtIOPCIProxy *proxy = opaque; 1496 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1497 uint16_t vector; 1498 1499 if (vdev == NULL) { 1500 return; 1501 } 1502 1503 switch (addr) { 1504 case VIRTIO_PCI_COMMON_DFSELECT: 1505 proxy->dfselect = val; 1506 break; 1507 case VIRTIO_PCI_COMMON_GFSELECT: 1508 proxy->gfselect = val; 1509 break; 1510 case VIRTIO_PCI_COMMON_GF: 1511 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) { 1512 proxy->guest_features[proxy->gfselect] = val; 1513 virtio_set_features(vdev, 1514 (((uint64_t)proxy->guest_features[1]) << 32) | 1515 proxy->guest_features[0]); 1516 } 1517 break; 1518 case VIRTIO_PCI_COMMON_MSIX: 1519 if (vdev->config_vector != VIRTIO_NO_VECTOR) { 1520 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector); 1521 } 1522 /* Make it possible for guest to discover an error took place. */ 1523 if (val < proxy->nvectors) { 1524 msix_vector_use(&proxy->pci_dev, val); 1525 } else { 1526 val = VIRTIO_NO_VECTOR; 1527 } 1528 vdev->config_vector = val; 1529 break; 1530 case VIRTIO_PCI_COMMON_STATUS: 1531 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) { 1532 virtio_pci_stop_ioeventfd(proxy); 1533 } 1534 1535 virtio_set_status(vdev, val & 0xFF); 1536 1537 if (val & VIRTIO_CONFIG_S_DRIVER_OK) { 1538 virtio_pci_start_ioeventfd(proxy); 1539 } 1540 1541 if (vdev->status == 0) { 1542 virtio_pci_reset(DEVICE(proxy)); 1543 } 1544 1545 break; 1546 case VIRTIO_PCI_COMMON_Q_SELECT: 1547 if (val < VIRTIO_QUEUE_MAX) { 1548 vdev->queue_sel = val; 1549 } 1550 break; 1551 case VIRTIO_PCI_COMMON_Q_SIZE: 1552 proxy->vqs[vdev->queue_sel].num = val; 1553 virtio_queue_set_num(vdev, vdev->queue_sel, 1554 proxy->vqs[vdev->queue_sel].num); 1555 break; 1556 case VIRTIO_PCI_COMMON_Q_MSIX: 1557 vector = virtio_queue_vector(vdev, vdev->queue_sel); 1558 if (vector != VIRTIO_NO_VECTOR) { 1559 msix_vector_unuse(&proxy->pci_dev, vector); 1560 } 1561 /* Make it possible for guest to discover an error took place. */ 1562 if (val < proxy->nvectors) { 1563 msix_vector_use(&proxy->pci_dev, val); 1564 } else { 1565 val = VIRTIO_NO_VECTOR; 1566 } 1567 virtio_queue_set_vector(vdev, vdev->queue_sel, val); 1568 break; 1569 case VIRTIO_PCI_COMMON_Q_ENABLE: 1570 if (val == 1) { 1571 virtio_queue_set_num(vdev, vdev->queue_sel, 1572 proxy->vqs[vdev->queue_sel].num); 1573 virtio_queue_set_rings(vdev, vdev->queue_sel, 1574 ((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 | 1575 proxy->vqs[vdev->queue_sel].desc[0], 1576 ((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 | 1577 proxy->vqs[vdev->queue_sel].avail[0], 1578 ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 | 1579 proxy->vqs[vdev->queue_sel].used[0]); 1580 proxy->vqs[vdev->queue_sel].enabled = 1; 1581 proxy->vqs[vdev->queue_sel].reset = 0; 1582 virtio_queue_enable(vdev, vdev->queue_sel); 1583 } else { 1584 virtio_error(vdev, "wrong value for queue_enable %"PRIx64, val); 1585 } 1586 break; 1587 case VIRTIO_PCI_COMMON_Q_DESCLO: 1588 proxy->vqs[vdev->queue_sel].desc[0] = val; 1589 break; 1590 case VIRTIO_PCI_COMMON_Q_DESCHI: 1591 proxy->vqs[vdev->queue_sel].desc[1] = val; 1592 break; 1593 case VIRTIO_PCI_COMMON_Q_AVAILLO: 1594 proxy->vqs[vdev->queue_sel].avail[0] = val; 1595 break; 1596 case VIRTIO_PCI_COMMON_Q_AVAILHI: 1597 proxy->vqs[vdev->queue_sel].avail[1] = val; 1598 break; 1599 case VIRTIO_PCI_COMMON_Q_USEDLO: 1600 proxy->vqs[vdev->queue_sel].used[0] = val; 1601 break; 1602 case VIRTIO_PCI_COMMON_Q_USEDHI: 1603 proxy->vqs[vdev->queue_sel].used[1] = val; 1604 break; 1605 case VIRTIO_PCI_COMMON_Q_RESET: 1606 if (val == 1) { 1607 proxy->vqs[vdev->queue_sel].reset = 1; 1608 1609 virtio_queue_reset(vdev, vdev->queue_sel); 1610 1611 proxy->vqs[vdev->queue_sel].reset = 0; 1612 proxy->vqs[vdev->queue_sel].enabled = 0; 1613 } 1614 break; 1615 default: 1616 break; 1617 } 1618 } 1619 1620 1621 static uint64_t virtio_pci_notify_read(void *opaque, hwaddr addr, 1622 unsigned size) 1623 { 1624 VirtIOPCIProxy *proxy = opaque; 1625 if (virtio_bus_get_device(&proxy->bus) == NULL) { 1626 return UINT64_MAX; 1627 } 1628 1629 return 0; 1630 } 1631 1632 static void virtio_pci_notify_write(void *opaque, hwaddr addr, 1633 uint64_t val, unsigned size) 1634 { 1635 VirtIOPCIProxy *proxy = opaque; 1636 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1637 1638 unsigned queue = addr / virtio_pci_queue_mem_mult(proxy); 1639 1640 if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) { 1641 trace_virtio_pci_notify_write(addr, val, size); 1642 virtio_queue_notify(vdev, queue); 1643 } 1644 } 1645 1646 static void virtio_pci_notify_write_pio(void *opaque, hwaddr addr, 1647 uint64_t val, unsigned size) 1648 { 1649 VirtIOPCIProxy *proxy = opaque; 1650 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1651 1652 unsigned queue = val; 1653 1654 if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) { 1655 trace_virtio_pci_notify_write_pio(addr, val, size); 1656 virtio_queue_notify(vdev, queue); 1657 } 1658 } 1659 1660 static uint64_t virtio_pci_isr_read(void *opaque, hwaddr addr, 1661 unsigned size) 1662 { 1663 VirtIOPCIProxy *proxy = opaque; 1664 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1665 uint64_t val; 1666 1667 if (vdev == NULL) { 1668 return UINT64_MAX; 1669 } 1670 1671 val = qatomic_xchg(&vdev->isr, 0); 1672 pci_irq_deassert(&proxy->pci_dev); 1673 return val; 1674 } 1675 1676 static void virtio_pci_isr_write(void *opaque, hwaddr addr, 1677 uint64_t val, unsigned size) 1678 { 1679 } 1680 1681 static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr, 1682 unsigned size) 1683 { 1684 VirtIOPCIProxy *proxy = opaque; 1685 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1686 uint64_t val; 1687 1688 if (vdev == NULL) { 1689 return UINT64_MAX; 1690 } 1691 1692 switch (size) { 1693 case 1: 1694 val = virtio_config_modern_readb(vdev, addr); 1695 break; 1696 case 2: 1697 val = virtio_config_modern_readw(vdev, addr); 1698 break; 1699 case 4: 1700 val = virtio_config_modern_readl(vdev, addr); 1701 break; 1702 default: 1703 val = 0; 1704 break; 1705 } 1706 return val; 1707 } 1708 1709 static void virtio_pci_device_write(void *opaque, hwaddr addr, 1710 uint64_t val, unsigned size) 1711 { 1712 VirtIOPCIProxy *proxy = opaque; 1713 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1714 1715 if (vdev == NULL) { 1716 return; 1717 } 1718 1719 switch (size) { 1720 case 1: 1721 virtio_config_modern_writeb(vdev, addr, val); 1722 break; 1723 case 2: 1724 virtio_config_modern_writew(vdev, addr, val); 1725 break; 1726 case 4: 1727 virtio_config_modern_writel(vdev, addr, val); 1728 break; 1729 } 1730 } 1731 1732 static void virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy, 1733 const char *vdev_name) 1734 { 1735 static const MemoryRegionOps common_ops = { 1736 .read = virtio_pci_common_read, 1737 .write = virtio_pci_common_write, 1738 .impl = { 1739 .min_access_size = 1, 1740 .max_access_size = 4, 1741 }, 1742 .endianness = DEVICE_LITTLE_ENDIAN, 1743 }; 1744 static const MemoryRegionOps isr_ops = { 1745 .read = virtio_pci_isr_read, 1746 .write = virtio_pci_isr_write, 1747 .impl = { 1748 .min_access_size = 1, 1749 .max_access_size = 4, 1750 }, 1751 .endianness = DEVICE_LITTLE_ENDIAN, 1752 }; 1753 static const MemoryRegionOps device_ops = { 1754 .read = virtio_pci_device_read, 1755 .write = virtio_pci_device_write, 1756 .impl = { 1757 .min_access_size = 1, 1758 .max_access_size = 4, 1759 }, 1760 .endianness = DEVICE_LITTLE_ENDIAN, 1761 }; 1762 static const MemoryRegionOps notify_ops = { 1763 .read = virtio_pci_notify_read, 1764 .write = virtio_pci_notify_write, 1765 .impl = { 1766 .min_access_size = 1, 1767 .max_access_size = 4, 1768 }, 1769 .endianness = DEVICE_LITTLE_ENDIAN, 1770 }; 1771 static const MemoryRegionOps notify_pio_ops = { 1772 .read = virtio_pci_notify_read, 1773 .write = virtio_pci_notify_write_pio, 1774 .impl = { 1775 .min_access_size = 1, 1776 .max_access_size = 4, 1777 }, 1778 .endianness = DEVICE_LITTLE_ENDIAN, 1779 }; 1780 g_autoptr(GString) name = g_string_new(NULL); 1781 1782 g_string_printf(name, "virtio-pci-common-%s", vdev_name); 1783 memory_region_init_io(&proxy->common.mr, OBJECT(proxy), 1784 &common_ops, 1785 proxy, 1786 name->str, 1787 proxy->common.size); 1788 1789 g_string_printf(name, "virtio-pci-isr-%s", vdev_name); 1790 memory_region_init_io(&proxy->isr.mr, OBJECT(proxy), 1791 &isr_ops, 1792 proxy, 1793 name->str, 1794 proxy->isr.size); 1795 1796 g_string_printf(name, "virtio-pci-device-%s", vdev_name); 1797 memory_region_init_io(&proxy->device.mr, OBJECT(proxy), 1798 &device_ops, 1799 proxy, 1800 name->str, 1801 proxy->device.size); 1802 1803 g_string_printf(name, "virtio-pci-notify-%s", vdev_name); 1804 memory_region_init_io(&proxy->notify.mr, OBJECT(proxy), 1805 ¬ify_ops, 1806 proxy, 1807 name->str, 1808 proxy->notify.size); 1809 1810 g_string_printf(name, "virtio-pci-notify-pio-%s", vdev_name); 1811 memory_region_init_io(&proxy->notify_pio.mr, OBJECT(proxy), 1812 ¬ify_pio_ops, 1813 proxy, 1814 name->str, 1815 proxy->notify_pio.size); 1816 } 1817 1818 static void virtio_pci_modern_region_map(VirtIOPCIProxy *proxy, 1819 VirtIOPCIRegion *region, 1820 struct virtio_pci_cap *cap, 1821 MemoryRegion *mr, 1822 uint8_t bar) 1823 { 1824 memory_region_add_subregion(mr, region->offset, ®ion->mr); 1825 1826 cap->cfg_type = region->type; 1827 cap->bar = bar; 1828 cap->offset = cpu_to_le32(region->offset); 1829 cap->length = cpu_to_le32(region->size); 1830 virtio_pci_add_mem_cap(proxy, cap); 1831 1832 } 1833 1834 static void virtio_pci_modern_mem_region_map(VirtIOPCIProxy *proxy, 1835 VirtIOPCIRegion *region, 1836 struct virtio_pci_cap *cap) 1837 { 1838 virtio_pci_modern_region_map(proxy, region, cap, 1839 &proxy->modern_bar, proxy->modern_mem_bar_idx); 1840 } 1841 1842 static void virtio_pci_modern_io_region_map(VirtIOPCIProxy *proxy, 1843 VirtIOPCIRegion *region, 1844 struct virtio_pci_cap *cap) 1845 { 1846 virtio_pci_modern_region_map(proxy, region, cap, 1847 &proxy->io_bar, proxy->modern_io_bar_idx); 1848 } 1849 1850 static void virtio_pci_modern_mem_region_unmap(VirtIOPCIProxy *proxy, 1851 VirtIOPCIRegion *region) 1852 { 1853 memory_region_del_subregion(&proxy->modern_bar, 1854 ®ion->mr); 1855 } 1856 1857 static void virtio_pci_modern_io_region_unmap(VirtIOPCIProxy *proxy, 1858 VirtIOPCIRegion *region) 1859 { 1860 memory_region_del_subregion(&proxy->io_bar, 1861 ®ion->mr); 1862 } 1863 1864 static void virtio_pci_pre_plugged(DeviceState *d, Error **errp) 1865 { 1866 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1867 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1868 1869 if (virtio_pci_modern(proxy)) { 1870 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 1871 } 1872 1873 virtio_add_feature(&vdev->host_features, VIRTIO_F_BAD_FEATURE); 1874 } 1875 1876 /* This is called by virtio-bus just after the device is plugged. */ 1877 static void virtio_pci_device_plugged(DeviceState *d, Error **errp) 1878 { 1879 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1880 VirtioBusState *bus = &proxy->bus; 1881 bool legacy = virtio_pci_legacy(proxy); 1882 bool modern; 1883 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 1884 uint8_t *config; 1885 uint32_t size; 1886 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1887 1888 /* 1889 * Virtio capabilities present without 1890 * VIRTIO_F_VERSION_1 confuses guests 1891 */ 1892 if (!proxy->ignore_backend_features && 1893 !virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) { 1894 virtio_pci_disable_modern(proxy); 1895 1896 if (!legacy) { 1897 error_setg(errp, "Device doesn't support modern mode, and legacy" 1898 " mode is disabled"); 1899 error_append_hint(errp, "Set disable-legacy to off\n"); 1900 1901 return; 1902 } 1903 } 1904 1905 modern = virtio_pci_modern(proxy); 1906 1907 config = proxy->pci_dev.config; 1908 if (proxy->class_code) { 1909 pci_config_set_class(config, proxy->class_code); 1910 } 1911 1912 if (legacy) { 1913 if (!virtio_legacy_allowed(vdev)) { 1914 /* 1915 * To avoid migration issues, we allow legacy mode when legacy 1916 * check is disabled in the old machine types (< 5.1). 1917 */ 1918 if (virtio_legacy_check_disabled(vdev)) { 1919 warn_report("device is modern-only, but for backward " 1920 "compatibility legacy is allowed"); 1921 } else { 1922 error_setg(errp, 1923 "device is modern-only, use disable-legacy=on"); 1924 return; 1925 } 1926 } 1927 if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) { 1928 error_setg(errp, "VIRTIO_F_IOMMU_PLATFORM was supported by" 1929 " neither legacy nor transitional device"); 1930 return; 1931 } 1932 /* 1933 * Legacy and transitional devices use specific subsystem IDs. 1934 * Note that the subsystem vendor ID (config + PCI_SUBSYSTEM_VENDOR_ID) 1935 * is set to PCI_SUBVENDOR_ID_REDHAT_QUMRANET by default. 1936 */ 1937 pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus)); 1938 if (proxy->trans_devid) { 1939 pci_config_set_device_id(config, proxy->trans_devid); 1940 } 1941 } else { 1942 /* pure virtio-1.0 */ 1943 pci_set_word(config + PCI_VENDOR_ID, 1944 PCI_VENDOR_ID_REDHAT_QUMRANET); 1945 pci_set_word(config + PCI_DEVICE_ID, 1946 PCI_DEVICE_ID_VIRTIO_10_BASE + virtio_bus_get_vdev_id(bus)); 1947 pci_config_set_revision(config, 1); 1948 } 1949 config[PCI_INTERRUPT_PIN] = 1; 1950 1951 1952 if (modern) { 1953 struct virtio_pci_cap cap = { 1954 .cap_len = sizeof cap, 1955 }; 1956 struct virtio_pci_notify_cap notify = { 1957 .cap.cap_len = sizeof notify, 1958 .notify_off_multiplier = 1959 cpu_to_le32(virtio_pci_queue_mem_mult(proxy)), 1960 }; 1961 struct virtio_pci_cfg_cap cfg = { 1962 .cap.cap_len = sizeof cfg, 1963 .cap.cfg_type = VIRTIO_PCI_CAP_PCI_CFG, 1964 }; 1965 struct virtio_pci_notify_cap notify_pio = { 1966 .cap.cap_len = sizeof notify, 1967 .notify_off_multiplier = cpu_to_le32(0x0), 1968 }; 1969 1970 struct virtio_pci_cfg_cap *cfg_mask; 1971 1972 virtio_pci_modern_regions_init(proxy, vdev->name); 1973 1974 virtio_pci_modern_mem_region_map(proxy, &proxy->common, &cap); 1975 virtio_pci_modern_mem_region_map(proxy, &proxy->isr, &cap); 1976 virtio_pci_modern_mem_region_map(proxy, &proxy->device, &cap); 1977 virtio_pci_modern_mem_region_map(proxy, &proxy->notify, ¬ify.cap); 1978 1979 if (modern_pio) { 1980 memory_region_init(&proxy->io_bar, OBJECT(proxy), 1981 "virtio-pci-io", 0x4); 1982 1983 pci_register_bar(&proxy->pci_dev, proxy->modern_io_bar_idx, 1984 PCI_BASE_ADDRESS_SPACE_IO, &proxy->io_bar); 1985 1986 virtio_pci_modern_io_region_map(proxy, &proxy->notify_pio, 1987 ¬ify_pio.cap); 1988 } 1989 1990 pci_register_bar(&proxy->pci_dev, proxy->modern_mem_bar_idx, 1991 PCI_BASE_ADDRESS_SPACE_MEMORY | 1992 PCI_BASE_ADDRESS_MEM_PREFETCH | 1993 PCI_BASE_ADDRESS_MEM_TYPE_64, 1994 &proxy->modern_bar); 1995 1996 proxy->config_cap = virtio_pci_add_mem_cap(proxy, &cfg.cap); 1997 cfg_mask = (void *)(proxy->pci_dev.wmask + proxy->config_cap); 1998 pci_set_byte(&cfg_mask->cap.bar, ~0x0); 1999 pci_set_long((uint8_t *)&cfg_mask->cap.offset, ~0x0); 2000 pci_set_long((uint8_t *)&cfg_mask->cap.length, ~0x0); 2001 pci_set_long(cfg_mask->pci_cfg_data, ~0x0); 2002 } 2003 2004 if (proxy->nvectors) { 2005 int err = msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 2006 proxy->msix_bar_idx, NULL); 2007 if (err) { 2008 /* Notice when a system that supports MSIx can't initialize it */ 2009 if (err != -ENOTSUP) { 2010 warn_report("unable to init msix vectors to %" PRIu32, 2011 proxy->nvectors); 2012 } 2013 proxy->nvectors = 0; 2014 } 2015 } 2016 2017 proxy->pci_dev.config_write = virtio_write_config; 2018 proxy->pci_dev.config_read = virtio_read_config; 2019 2020 if (legacy) { 2021 size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) 2022 + virtio_bus_get_vdev_config_len(bus); 2023 size = pow2ceil(size); 2024 2025 memory_region_init_io(&proxy->bar, OBJECT(proxy), 2026 &virtio_pci_config_ops, 2027 proxy, "virtio-pci", size); 2028 2029 pci_register_bar(&proxy->pci_dev, proxy->legacy_io_bar_idx, 2030 PCI_BASE_ADDRESS_SPACE_IO, &proxy->bar); 2031 } 2032 } 2033 2034 static void virtio_pci_device_unplugged(DeviceState *d) 2035 { 2036 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 2037 bool modern = virtio_pci_modern(proxy); 2038 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 2039 2040 virtio_pci_stop_ioeventfd(proxy); 2041 2042 if (modern) { 2043 virtio_pci_modern_mem_region_unmap(proxy, &proxy->common); 2044 virtio_pci_modern_mem_region_unmap(proxy, &proxy->isr); 2045 virtio_pci_modern_mem_region_unmap(proxy, &proxy->device); 2046 virtio_pci_modern_mem_region_unmap(proxy, &proxy->notify); 2047 if (modern_pio) { 2048 virtio_pci_modern_io_region_unmap(proxy, &proxy->notify_pio); 2049 } 2050 } 2051 } 2052 2053 static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp) 2054 { 2055 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 2056 VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev); 2057 bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) && 2058 !pci_bus_is_root(pci_get_bus(pci_dev)); 2059 2060 if (kvm_enabled() && !kvm_has_many_ioeventfds()) { 2061 proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD; 2062 } 2063 2064 /* fd-based ioevents can't be synchronized in record/replay */ 2065 if (replay_mode != REPLAY_MODE_NONE) { 2066 proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD; 2067 } 2068 2069 /* 2070 * virtio pci bar layout used by default. 2071 * subclasses can re-arrange things if needed. 2072 * 2073 * region 0 -- virtio legacy io bar 2074 * region 1 -- msi-x bar 2075 * region 2 -- virtio modern io bar (off by default) 2076 * region 4+5 -- virtio modern memory (64bit) bar 2077 * 2078 */ 2079 proxy->legacy_io_bar_idx = 0; 2080 proxy->msix_bar_idx = 1; 2081 proxy->modern_io_bar_idx = 2; 2082 proxy->modern_mem_bar_idx = 4; 2083 2084 proxy->common.offset = 0x0; 2085 proxy->common.size = 0x1000; 2086 proxy->common.type = VIRTIO_PCI_CAP_COMMON_CFG; 2087 2088 proxy->isr.offset = 0x1000; 2089 proxy->isr.size = 0x1000; 2090 proxy->isr.type = VIRTIO_PCI_CAP_ISR_CFG; 2091 2092 proxy->device.offset = 0x2000; 2093 proxy->device.size = 0x1000; 2094 proxy->device.type = VIRTIO_PCI_CAP_DEVICE_CFG; 2095 2096 proxy->notify.offset = 0x3000; 2097 proxy->notify.size = virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX; 2098 proxy->notify.type = VIRTIO_PCI_CAP_NOTIFY_CFG; 2099 2100 proxy->notify_pio.offset = 0x0; 2101 proxy->notify_pio.size = 0x4; 2102 proxy->notify_pio.type = VIRTIO_PCI_CAP_NOTIFY_CFG; 2103 2104 /* subclasses can enforce modern, so do this unconditionally */ 2105 memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci", 2106 /* PCI BAR regions must be powers of 2 */ 2107 pow2ceil(proxy->notify.offset + proxy->notify.size)); 2108 2109 if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) { 2110 proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF; 2111 } 2112 2113 if (!virtio_pci_modern(proxy) && !virtio_pci_legacy(proxy)) { 2114 error_setg(errp, "device cannot work as neither modern nor legacy mode" 2115 " is enabled"); 2116 error_append_hint(errp, "Set either disable-modern or disable-legacy" 2117 " to off\n"); 2118 return; 2119 } 2120 2121 if (pcie_port && pci_is_express(pci_dev)) { 2122 int pos; 2123 uint16_t last_pcie_cap_offset = PCI_CONFIG_SPACE_SIZE; 2124 2125 pos = pcie_endpoint_cap_init(pci_dev, 0); 2126 assert(pos > 0); 2127 2128 pos = pci_add_capability(pci_dev, PCI_CAP_ID_PM, 0, 2129 PCI_PM_SIZEOF, errp); 2130 if (pos < 0) { 2131 return; 2132 } 2133 2134 pci_dev->exp.pm_cap = pos; 2135 2136 /* 2137 * Indicates that this function complies with revision 1.2 of the 2138 * PCI Power Management Interface Specification. 2139 */ 2140 pci_set_word(pci_dev->config + pos + PCI_PM_PMC, 0x3); 2141 2142 if (proxy->flags & VIRTIO_PCI_FLAG_AER) { 2143 pcie_aer_init(pci_dev, PCI_ERR_VER, last_pcie_cap_offset, 2144 PCI_ERR_SIZEOF, NULL); 2145 last_pcie_cap_offset += PCI_ERR_SIZEOF; 2146 } 2147 2148 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_DEVERR) { 2149 /* Init error enabling flags */ 2150 pcie_cap_deverr_init(pci_dev); 2151 } 2152 2153 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_LNKCTL) { 2154 /* Init Link Control Register */ 2155 pcie_cap_lnkctl_init(pci_dev); 2156 } 2157 2158 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_PM) { 2159 /* Init Power Management Control Register */ 2160 pci_set_word(pci_dev->wmask + pos + PCI_PM_CTRL, 2161 PCI_PM_CTRL_STATE_MASK); 2162 } 2163 2164 if (proxy->flags & VIRTIO_PCI_FLAG_ATS) { 2165 pcie_ats_init(pci_dev, last_pcie_cap_offset, 2166 proxy->flags & VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED); 2167 last_pcie_cap_offset += PCI_EXT_CAP_ATS_SIZEOF; 2168 } 2169 2170 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) { 2171 /* Set Function Level Reset capability bit */ 2172 pcie_cap_flr_init(pci_dev); 2173 } 2174 } else { 2175 /* 2176 * make future invocations of pci_is_express() return false 2177 * and pci_config_size() return PCI_CONFIG_SPACE_SIZE. 2178 */ 2179 pci_dev->cap_present &= ~QEMU_PCI_CAP_EXPRESS; 2180 } 2181 2182 virtio_pci_bus_new(&proxy->bus, sizeof(proxy->bus), proxy); 2183 if (k->realize) { 2184 k->realize(proxy, errp); 2185 } 2186 } 2187 2188 static void virtio_pci_exit(PCIDevice *pci_dev) 2189 { 2190 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 2191 bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) && 2192 !pci_bus_is_root(pci_get_bus(pci_dev)); 2193 2194 msix_uninit_exclusive_bar(pci_dev); 2195 if (proxy->flags & VIRTIO_PCI_FLAG_AER && pcie_port && 2196 pci_is_express(pci_dev)) { 2197 pcie_aer_exit(pci_dev); 2198 } 2199 } 2200 2201 static void virtio_pci_reset(DeviceState *qdev) 2202 { 2203 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev); 2204 VirtioBusState *bus = VIRTIO_BUS(&proxy->bus); 2205 int i; 2206 2207 virtio_bus_reset(bus); 2208 msix_unuse_all_vectors(&proxy->pci_dev); 2209 2210 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { 2211 proxy->vqs[i].enabled = 0; 2212 proxy->vqs[i].reset = 0; 2213 proxy->vqs[i].num = 0; 2214 proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0; 2215 proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0; 2216 proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0; 2217 } 2218 } 2219 2220 static void virtio_pci_bus_reset_hold(Object *obj) 2221 { 2222 PCIDevice *dev = PCI_DEVICE(obj); 2223 DeviceState *qdev = DEVICE(obj); 2224 2225 virtio_pci_reset(qdev); 2226 2227 if (pci_is_express(dev)) { 2228 pcie_cap_deverr_reset(dev); 2229 pcie_cap_lnkctl_reset(dev); 2230 2231 pci_set_word(dev->config + dev->exp.pm_cap + PCI_PM_CTRL, 0); 2232 } 2233 } 2234 2235 static Property virtio_pci_properties[] = { 2236 DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy, flags, 2237 VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT, false), 2238 DEFINE_PROP_BIT("migrate-extra", VirtIOPCIProxy, flags, 2239 VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT, true), 2240 DEFINE_PROP_BIT("modern-pio-notify", VirtIOPCIProxy, flags, 2241 VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT, false), 2242 DEFINE_PROP_BIT("x-disable-pcie", VirtIOPCIProxy, flags, 2243 VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT, false), 2244 DEFINE_PROP_BIT("page-per-vq", VirtIOPCIProxy, flags, 2245 VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT, false), 2246 DEFINE_PROP_BOOL("x-ignore-backend-features", VirtIOPCIProxy, 2247 ignore_backend_features, false), 2248 DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags, 2249 VIRTIO_PCI_FLAG_ATS_BIT, false), 2250 DEFINE_PROP_BIT("x-ats-page-aligned", VirtIOPCIProxy, flags, 2251 VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT, true), 2252 DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy, flags, 2253 VIRTIO_PCI_FLAG_INIT_DEVERR_BIT, true), 2254 DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy, flags, 2255 VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT, true), 2256 DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy, flags, 2257 VIRTIO_PCI_FLAG_INIT_PM_BIT, true), 2258 DEFINE_PROP_BIT("x-pcie-flr-init", VirtIOPCIProxy, flags, 2259 VIRTIO_PCI_FLAG_INIT_FLR_BIT, true), 2260 DEFINE_PROP_BIT("aer", VirtIOPCIProxy, flags, 2261 VIRTIO_PCI_FLAG_AER_BIT, false), 2262 DEFINE_PROP_END_OF_LIST(), 2263 }; 2264 2265 static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp) 2266 { 2267 VirtioPCIClass *vpciklass = VIRTIO_PCI_GET_CLASS(qdev); 2268 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev); 2269 PCIDevice *pci_dev = &proxy->pci_dev; 2270 2271 if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) && 2272 virtio_pci_modern(proxy)) { 2273 pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS; 2274 } 2275 2276 vpciklass->parent_dc_realize(qdev, errp); 2277 } 2278 2279 static void virtio_pci_class_init(ObjectClass *klass, void *data) 2280 { 2281 DeviceClass *dc = DEVICE_CLASS(klass); 2282 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 2283 VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass); 2284 ResettableClass *rc = RESETTABLE_CLASS(klass); 2285 2286 device_class_set_props(dc, virtio_pci_properties); 2287 k->realize = virtio_pci_realize; 2288 k->exit = virtio_pci_exit; 2289 k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; 2290 k->revision = VIRTIO_PCI_ABI_VERSION; 2291 k->class_id = PCI_CLASS_OTHERS; 2292 device_class_set_parent_realize(dc, virtio_pci_dc_realize, 2293 &vpciklass->parent_dc_realize); 2294 rc->phases.hold = virtio_pci_bus_reset_hold; 2295 } 2296 2297 static const TypeInfo virtio_pci_info = { 2298 .name = TYPE_VIRTIO_PCI, 2299 .parent = TYPE_PCI_DEVICE, 2300 .instance_size = sizeof(VirtIOPCIProxy), 2301 .class_init = virtio_pci_class_init, 2302 .class_size = sizeof(VirtioPCIClass), 2303 .abstract = true, 2304 }; 2305 2306 static Property virtio_pci_generic_properties[] = { 2307 DEFINE_PROP_ON_OFF_AUTO("disable-legacy", VirtIOPCIProxy, disable_legacy, 2308 ON_OFF_AUTO_AUTO), 2309 DEFINE_PROP_BOOL("disable-modern", VirtIOPCIProxy, disable_modern, false), 2310 DEFINE_PROP_END_OF_LIST(), 2311 }; 2312 2313 static void virtio_pci_base_class_init(ObjectClass *klass, void *data) 2314 { 2315 const VirtioPCIDeviceTypeInfo *t = data; 2316 if (t->class_init) { 2317 t->class_init(klass, NULL); 2318 } 2319 } 2320 2321 static void virtio_pci_generic_class_init(ObjectClass *klass, void *data) 2322 { 2323 DeviceClass *dc = DEVICE_CLASS(klass); 2324 2325 device_class_set_props(dc, virtio_pci_generic_properties); 2326 } 2327 2328 static void virtio_pci_transitional_instance_init(Object *obj) 2329 { 2330 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj); 2331 2332 proxy->disable_legacy = ON_OFF_AUTO_OFF; 2333 proxy->disable_modern = false; 2334 } 2335 2336 static void virtio_pci_non_transitional_instance_init(Object *obj) 2337 { 2338 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj); 2339 2340 proxy->disable_legacy = ON_OFF_AUTO_ON; 2341 proxy->disable_modern = false; 2342 } 2343 2344 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t) 2345 { 2346 char *base_name = NULL; 2347 TypeInfo base_type_info = { 2348 .name = t->base_name, 2349 .parent = t->parent ? t->parent : TYPE_VIRTIO_PCI, 2350 .instance_size = t->instance_size, 2351 .instance_init = t->instance_init, 2352 .class_size = t->class_size, 2353 .abstract = true, 2354 .interfaces = t->interfaces, 2355 }; 2356 TypeInfo generic_type_info = { 2357 .name = t->generic_name, 2358 .parent = base_type_info.name, 2359 .class_init = virtio_pci_generic_class_init, 2360 .interfaces = (InterfaceInfo[]) { 2361 { INTERFACE_PCIE_DEVICE }, 2362 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 2363 { } 2364 }, 2365 }; 2366 2367 if (!base_type_info.name) { 2368 /* No base type -> register a single generic device type */ 2369 /* use intermediate %s-base-type to add generic device props */ 2370 base_name = g_strdup_printf("%s-base-type", t->generic_name); 2371 base_type_info.name = base_name; 2372 base_type_info.class_init = virtio_pci_generic_class_init; 2373 2374 generic_type_info.parent = base_name; 2375 generic_type_info.class_init = virtio_pci_base_class_init; 2376 generic_type_info.class_data = (void *)t; 2377 2378 assert(!t->non_transitional_name); 2379 assert(!t->transitional_name); 2380 } else { 2381 base_type_info.class_init = virtio_pci_base_class_init; 2382 base_type_info.class_data = (void *)t; 2383 } 2384 2385 type_register(&base_type_info); 2386 if (generic_type_info.name) { 2387 type_register(&generic_type_info); 2388 } 2389 2390 if (t->non_transitional_name) { 2391 const TypeInfo non_transitional_type_info = { 2392 .name = t->non_transitional_name, 2393 .parent = base_type_info.name, 2394 .instance_init = virtio_pci_non_transitional_instance_init, 2395 .interfaces = (InterfaceInfo[]) { 2396 { INTERFACE_PCIE_DEVICE }, 2397 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 2398 { } 2399 }, 2400 }; 2401 type_register(&non_transitional_type_info); 2402 } 2403 2404 if (t->transitional_name) { 2405 const TypeInfo transitional_type_info = { 2406 .name = t->transitional_name, 2407 .parent = base_type_info.name, 2408 .instance_init = virtio_pci_transitional_instance_init, 2409 .interfaces = (InterfaceInfo[]) { 2410 /* 2411 * Transitional virtio devices work only as Conventional PCI 2412 * devices because they require PIO ports. 2413 */ 2414 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 2415 { } 2416 }, 2417 }; 2418 type_register(&transitional_type_info); 2419 } 2420 g_free(base_name); 2421 } 2422 2423 unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues) 2424 { 2425 /* 2426 * 1:1 vq to vCPU mapping is ideal because the same vCPU that submitted 2427 * virtqueue buffers can handle their completion. When a different vCPU 2428 * handles completion it may need to IPI the vCPU that submitted the 2429 * request and this adds overhead. 2430 * 2431 * Virtqueues consume guest RAM and MSI-X vectors. This is wasteful in 2432 * guests with very many vCPUs and a device that is only used by a few 2433 * vCPUs. Unfortunately optimizing that case requires manual pinning inside 2434 * the guest, so those users might as well manually set the number of 2435 * queues. There is no upper limit that can be applied automatically and 2436 * doing so arbitrarily would result in a sudden performance drop once the 2437 * threshold number of vCPUs is exceeded. 2438 */ 2439 unsigned num_queues = current_machine->smp.cpus; 2440 2441 /* 2442 * The maximum number of MSI-X vectors is PCI_MSIX_FLAGS_QSIZE + 1, but the 2443 * config change interrupt and the fixed virtqueues must be taken into 2444 * account too. 2445 */ 2446 num_queues = MIN(num_queues, PCI_MSIX_FLAGS_QSIZE - fixed_queues); 2447 2448 /* 2449 * There is a limit to how many virtqueues a device can have. 2450 */ 2451 return MIN(num_queues, VIRTIO_QUEUE_MAX - fixed_queues); 2452 } 2453 2454 /* virtio-pci-bus */ 2455 2456 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size, 2457 VirtIOPCIProxy *dev) 2458 { 2459 DeviceState *qdev = DEVICE(dev); 2460 char virtio_bus_name[] = "virtio-bus"; 2461 2462 qbus_init(bus, bus_size, TYPE_VIRTIO_PCI_BUS, qdev, virtio_bus_name); 2463 } 2464 2465 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data) 2466 { 2467 BusClass *bus_class = BUS_CLASS(klass); 2468 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 2469 bus_class->max_dev = 1; 2470 k->notify = virtio_pci_notify; 2471 k->save_config = virtio_pci_save_config; 2472 k->load_config = virtio_pci_load_config; 2473 k->save_queue = virtio_pci_save_queue; 2474 k->load_queue = virtio_pci_load_queue; 2475 k->save_extra_state = virtio_pci_save_extra_state; 2476 k->load_extra_state = virtio_pci_load_extra_state; 2477 k->has_extra_state = virtio_pci_has_extra_state; 2478 k->query_guest_notifiers = virtio_pci_query_guest_notifiers; 2479 k->set_guest_notifiers = virtio_pci_set_guest_notifiers; 2480 k->set_host_notifier_mr = virtio_pci_set_host_notifier_mr; 2481 k->vmstate_change = virtio_pci_vmstate_change; 2482 k->pre_plugged = virtio_pci_pre_plugged; 2483 k->device_plugged = virtio_pci_device_plugged; 2484 k->device_unplugged = virtio_pci_device_unplugged; 2485 k->query_nvectors = virtio_pci_query_nvectors; 2486 k->ioeventfd_enabled = virtio_pci_ioeventfd_enabled; 2487 k->ioeventfd_assign = virtio_pci_ioeventfd_assign; 2488 k->get_dma_as = virtio_pci_get_dma_as; 2489 k->iommu_enabled = virtio_pci_iommu_enabled; 2490 k->queue_enabled = virtio_pci_queue_enabled; 2491 } 2492 2493 static const TypeInfo virtio_pci_bus_info = { 2494 .name = TYPE_VIRTIO_PCI_BUS, 2495 .parent = TYPE_VIRTIO_BUS, 2496 .instance_size = sizeof(VirtioPCIBusState), 2497 .class_size = sizeof(VirtioPCIBusClass), 2498 .class_init = virtio_pci_bus_class_init, 2499 }; 2500 2501 static void virtio_pci_register_types(void) 2502 { 2503 /* Base types: */ 2504 type_register_static(&virtio_pci_bus_info); 2505 type_register_static(&virtio_pci_info); 2506 } 2507 2508 type_init(virtio_pci_register_types) 2509 2510