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 modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 336 MemoryRegion *modern_mr = &proxy->notify.mr; 337 MemoryRegion *modern_notify_mr = &proxy->notify_pio.mr; 338 MemoryRegion *legacy_mr = &proxy->bar; 339 hwaddr modern_addr = virtio_pci_queue_mem_mult(proxy) * 340 virtio_get_queue_index(vq); 341 hwaddr legacy_addr = VIRTIO_PCI_QUEUE_NOTIFY; 342 343 if (assign) { 344 if (modern) { 345 memory_region_add_eventfd(modern_mr, modern_addr, 0, 346 false, n, notifier); 347 if (modern_pio) { 348 memory_region_add_eventfd(modern_notify_mr, 0, 2, 349 true, n, notifier); 350 } 351 } 352 if (legacy) { 353 memory_region_add_eventfd(legacy_mr, legacy_addr, 2, 354 true, n, notifier); 355 } 356 } else { 357 if (modern) { 358 memory_region_del_eventfd(modern_mr, modern_addr, 0, 359 false, n, notifier); 360 if (modern_pio) { 361 memory_region_del_eventfd(modern_notify_mr, 0, 2, 362 true, n, notifier); 363 } 364 } 365 if (legacy) { 366 memory_region_del_eventfd(legacy_mr, legacy_addr, 2, 367 true, n, notifier); 368 } 369 } 370 return 0; 371 } 372 373 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy) 374 { 375 virtio_bus_start_ioeventfd(&proxy->bus); 376 } 377 378 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy) 379 { 380 virtio_bus_stop_ioeventfd(&proxy->bus); 381 } 382 383 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) 384 { 385 VirtIOPCIProxy *proxy = opaque; 386 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 387 uint16_t vector; 388 hwaddr pa; 389 390 switch (addr) { 391 case VIRTIO_PCI_GUEST_FEATURES: 392 /* Guest does not negotiate properly? We have to assume nothing. */ 393 if (val & (1 << VIRTIO_F_BAD_FEATURE)) { 394 val = virtio_bus_get_vdev_bad_features(&proxy->bus); 395 } 396 virtio_set_features(vdev, val); 397 break; 398 case VIRTIO_PCI_QUEUE_PFN: 399 pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT; 400 if (pa == 0) { 401 virtio_pci_reset(DEVICE(proxy)); 402 } 403 else 404 virtio_queue_set_addr(vdev, vdev->queue_sel, pa); 405 break; 406 case VIRTIO_PCI_QUEUE_SEL: 407 if (val < VIRTIO_QUEUE_MAX) 408 vdev->queue_sel = val; 409 break; 410 case VIRTIO_PCI_QUEUE_NOTIFY: 411 if (val < VIRTIO_QUEUE_MAX) { 412 virtio_queue_notify(vdev, val); 413 } 414 break; 415 case VIRTIO_PCI_STATUS: 416 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) { 417 virtio_pci_stop_ioeventfd(proxy); 418 } 419 420 virtio_set_status(vdev, val & 0xFF); 421 422 if (val & VIRTIO_CONFIG_S_DRIVER_OK) { 423 virtio_pci_start_ioeventfd(proxy); 424 } 425 426 if (vdev->status == 0) { 427 virtio_pci_reset(DEVICE(proxy)); 428 } 429 430 /* Linux before 2.6.34 drives the device without enabling 431 the PCI device bus master bit. Enable it automatically 432 for the guest. This is a PCI spec violation but so is 433 initiating DMA with bus master bit clear. */ 434 if (val == (VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER)) { 435 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND, 436 proxy->pci_dev.config[PCI_COMMAND] | 437 PCI_COMMAND_MASTER, 1); 438 } 439 break; 440 case VIRTIO_MSI_CONFIG_VECTOR: 441 if (vdev->config_vector != VIRTIO_NO_VECTOR) { 442 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector); 443 } 444 /* Make it possible for guest to discover an error took place. */ 445 if (val < proxy->nvectors) { 446 msix_vector_use(&proxy->pci_dev, val); 447 } else { 448 val = VIRTIO_NO_VECTOR; 449 } 450 vdev->config_vector = val; 451 break; 452 case VIRTIO_MSI_QUEUE_VECTOR: 453 vector = virtio_queue_vector(vdev, vdev->queue_sel); 454 if (vector != VIRTIO_NO_VECTOR) { 455 msix_vector_unuse(&proxy->pci_dev, vector); 456 } 457 /* Make it possible for guest to discover an error took place. */ 458 if (val < proxy->nvectors) { 459 msix_vector_use(&proxy->pci_dev, val); 460 } else { 461 val = VIRTIO_NO_VECTOR; 462 } 463 virtio_queue_set_vector(vdev, vdev->queue_sel, val); 464 break; 465 default: 466 qemu_log_mask(LOG_GUEST_ERROR, 467 "%s: unexpected address 0x%x value 0x%x\n", 468 __func__, addr, val); 469 break; 470 } 471 } 472 473 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr) 474 { 475 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 476 uint32_t ret = 0xFFFFFFFF; 477 478 switch (addr) { 479 case VIRTIO_PCI_HOST_FEATURES: 480 ret = vdev->host_features; 481 break; 482 case VIRTIO_PCI_GUEST_FEATURES: 483 ret = vdev->guest_features; 484 break; 485 case VIRTIO_PCI_QUEUE_PFN: 486 ret = virtio_queue_get_addr(vdev, vdev->queue_sel) 487 >> VIRTIO_PCI_QUEUE_ADDR_SHIFT; 488 break; 489 case VIRTIO_PCI_QUEUE_NUM: 490 ret = virtio_queue_get_num(vdev, vdev->queue_sel); 491 break; 492 case VIRTIO_PCI_QUEUE_SEL: 493 ret = vdev->queue_sel; 494 break; 495 case VIRTIO_PCI_STATUS: 496 ret = vdev->status; 497 break; 498 case VIRTIO_PCI_ISR: 499 /* reading from the ISR also clears it. */ 500 ret = qatomic_xchg(&vdev->isr, 0); 501 pci_irq_deassert(&proxy->pci_dev); 502 break; 503 case VIRTIO_MSI_CONFIG_VECTOR: 504 ret = vdev->config_vector; 505 break; 506 case VIRTIO_MSI_QUEUE_VECTOR: 507 ret = virtio_queue_vector(vdev, vdev->queue_sel); 508 break; 509 default: 510 break; 511 } 512 513 return ret; 514 } 515 516 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr, 517 unsigned size) 518 { 519 VirtIOPCIProxy *proxy = opaque; 520 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 521 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev); 522 uint64_t val = 0; 523 524 if (vdev == NULL) { 525 return UINT64_MAX; 526 } 527 528 if (addr < config) { 529 return virtio_ioport_read(proxy, addr); 530 } 531 addr -= config; 532 533 switch (size) { 534 case 1: 535 val = virtio_config_readb(vdev, addr); 536 break; 537 case 2: 538 val = virtio_config_readw(vdev, addr); 539 if (virtio_is_big_endian(vdev)) { 540 val = bswap16(val); 541 } 542 break; 543 case 4: 544 val = virtio_config_readl(vdev, addr); 545 if (virtio_is_big_endian(vdev)) { 546 val = bswap32(val); 547 } 548 break; 549 } 550 return val; 551 } 552 553 static void virtio_pci_config_write(void *opaque, hwaddr addr, 554 uint64_t val, unsigned size) 555 { 556 VirtIOPCIProxy *proxy = opaque; 557 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev); 558 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 559 560 if (vdev == NULL) { 561 return; 562 } 563 564 if (addr < config) { 565 virtio_ioport_write(proxy, addr, val); 566 return; 567 } 568 addr -= config; 569 /* 570 * Virtio-PCI is odd. Ioports are LE but config space is target native 571 * endian. 572 */ 573 switch (size) { 574 case 1: 575 virtio_config_writeb(vdev, addr, val); 576 break; 577 case 2: 578 if (virtio_is_big_endian(vdev)) { 579 val = bswap16(val); 580 } 581 virtio_config_writew(vdev, addr, val); 582 break; 583 case 4: 584 if (virtio_is_big_endian(vdev)) { 585 val = bswap32(val); 586 } 587 virtio_config_writel(vdev, addr, val); 588 break; 589 } 590 } 591 592 static const MemoryRegionOps virtio_pci_config_ops = { 593 .read = virtio_pci_config_read, 594 .write = virtio_pci_config_write, 595 .impl = { 596 .min_access_size = 1, 597 .max_access_size = 4, 598 }, 599 .endianness = DEVICE_LITTLE_ENDIAN, 600 }; 601 602 static MemoryRegion *virtio_address_space_lookup(VirtIOPCIProxy *proxy, 603 hwaddr *off, int len) 604 { 605 int i; 606 VirtIOPCIRegion *reg; 607 608 for (i = 0; i < ARRAY_SIZE(proxy->regs); ++i) { 609 reg = &proxy->regs[i]; 610 if (*off >= reg->offset && 611 *off + len <= reg->offset + reg->size) { 612 *off -= reg->offset; 613 return ®->mr; 614 } 615 } 616 617 return NULL; 618 } 619 620 /* Below are generic functions to do memcpy from/to an address space, 621 * without byteswaps, with input validation. 622 * 623 * As regular address_space_* APIs all do some kind of byteswap at least for 624 * some host/target combinations, we are forced to explicitly convert to a 625 * known-endianness integer value. 626 * It doesn't really matter which endian format to go through, so the code 627 * below selects the endian that causes the least amount of work on the given 628 * host. 629 * 630 * Note: host pointer must be aligned. 631 */ 632 static 633 void virtio_address_space_write(VirtIOPCIProxy *proxy, hwaddr addr, 634 const uint8_t *buf, int len) 635 { 636 uint64_t val; 637 MemoryRegion *mr; 638 639 /* address_space_* APIs assume an aligned address. 640 * As address is under guest control, handle illegal values. 641 */ 642 addr &= ~(len - 1); 643 644 mr = virtio_address_space_lookup(proxy, &addr, len); 645 if (!mr) { 646 return; 647 } 648 649 /* Make sure caller aligned buf properly */ 650 assert(!(((uintptr_t)buf) & (len - 1))); 651 652 switch (len) { 653 case 1: 654 val = pci_get_byte(buf); 655 break; 656 case 2: 657 val = pci_get_word(buf); 658 break; 659 case 4: 660 val = pci_get_long(buf); 661 break; 662 default: 663 /* As length is under guest control, handle illegal values. */ 664 return; 665 } 666 memory_region_dispatch_write(mr, addr, val, size_memop(len) | MO_LE, 667 MEMTXATTRS_UNSPECIFIED); 668 } 669 670 static void 671 virtio_address_space_read(VirtIOPCIProxy *proxy, hwaddr addr, 672 uint8_t *buf, int len) 673 { 674 uint64_t val; 675 MemoryRegion *mr; 676 677 /* address_space_* APIs assume an aligned address. 678 * As address is under guest control, handle illegal values. 679 */ 680 addr &= ~(len - 1); 681 682 mr = virtio_address_space_lookup(proxy, &addr, len); 683 if (!mr) { 684 return; 685 } 686 687 /* Make sure caller aligned buf properly */ 688 assert(!(((uintptr_t)buf) & (len - 1))); 689 690 memory_region_dispatch_read(mr, addr, &val, size_memop(len) | MO_LE, 691 MEMTXATTRS_UNSPECIFIED); 692 switch (len) { 693 case 1: 694 pci_set_byte(buf, val); 695 break; 696 case 2: 697 pci_set_word(buf, val); 698 break; 699 case 4: 700 pci_set_long(buf, val); 701 break; 702 default: 703 /* As length is under guest control, handle illegal values. */ 704 break; 705 } 706 } 707 708 static void virtio_pci_ats_ctrl_trigger(PCIDevice *pci_dev, bool enable) 709 { 710 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 711 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 712 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 713 714 vdev->device_iotlb_enabled = enable; 715 716 if (k->toggle_device_iotlb) { 717 k->toggle_device_iotlb(vdev); 718 } 719 } 720 721 static void pcie_ats_config_write(PCIDevice *dev, uint32_t address, 722 uint32_t val, int len) 723 { 724 uint32_t off; 725 uint16_t ats_cap = dev->exp.ats_cap; 726 727 if (!ats_cap || address < ats_cap) { 728 return; 729 } 730 off = address - ats_cap; 731 if (off >= PCI_EXT_CAP_ATS_SIZEOF) { 732 return; 733 } 734 735 if (range_covers_byte(off, len, PCI_ATS_CTRL + 1)) { 736 virtio_pci_ats_ctrl_trigger(dev, !!(val & PCI_ATS_CTRL_ENABLE)); 737 } 738 } 739 740 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address, 741 uint32_t val, int len) 742 { 743 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 744 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 745 struct virtio_pci_cfg_cap *cfg; 746 747 pci_default_write_config(pci_dev, address, val, len); 748 749 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) { 750 pcie_cap_flr_write_config(pci_dev, address, val, len); 751 } 752 753 if (proxy->flags & VIRTIO_PCI_FLAG_ATS) { 754 pcie_ats_config_write(pci_dev, address, val, len); 755 } 756 757 if (range_covers_byte(address, len, PCI_COMMAND)) { 758 if (!(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) { 759 virtio_set_disabled(vdev, true); 760 virtio_pci_stop_ioeventfd(proxy); 761 virtio_set_status(vdev, vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK); 762 } else { 763 virtio_set_disabled(vdev, false); 764 } 765 } 766 767 if (proxy->config_cap && 768 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap, 769 pci_cfg_data), 770 sizeof cfg->pci_cfg_data)) { 771 uint32_t off; 772 uint32_t caplen; 773 774 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap); 775 off = le32_to_cpu(cfg->cap.offset); 776 caplen = le32_to_cpu(cfg->cap.length); 777 778 if (caplen == 1 || caplen == 2 || caplen == 4) { 779 assert(caplen <= sizeof cfg->pci_cfg_data); 780 virtio_address_space_write(proxy, off, cfg->pci_cfg_data, caplen); 781 } 782 } 783 } 784 785 static uint32_t virtio_read_config(PCIDevice *pci_dev, 786 uint32_t address, int len) 787 { 788 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 789 struct virtio_pci_cfg_cap *cfg; 790 791 if (proxy->config_cap && 792 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap, 793 pci_cfg_data), 794 sizeof cfg->pci_cfg_data)) { 795 uint32_t off; 796 uint32_t caplen; 797 798 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap); 799 off = le32_to_cpu(cfg->cap.offset); 800 caplen = le32_to_cpu(cfg->cap.length); 801 802 if (caplen == 1 || caplen == 2 || caplen == 4) { 803 assert(caplen <= sizeof cfg->pci_cfg_data); 804 virtio_address_space_read(proxy, off, cfg->pci_cfg_data, caplen); 805 } 806 } 807 808 return pci_default_read_config(pci_dev, address, len); 809 } 810 811 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy, 812 unsigned int vector) 813 { 814 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 815 int ret; 816 817 if (irqfd->users == 0) { 818 KVMRouteChange c = kvm_irqchip_begin_route_changes(kvm_state); 819 ret = kvm_irqchip_add_msi_route(&c, vector, &proxy->pci_dev); 820 if (ret < 0) { 821 return ret; 822 } 823 kvm_irqchip_commit_route_changes(&c); 824 irqfd->virq = ret; 825 } 826 irqfd->users++; 827 return 0; 828 } 829 830 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy, 831 unsigned int vector) 832 { 833 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 834 if (--irqfd->users == 0) { 835 kvm_irqchip_release_virq(kvm_state, irqfd->virq); 836 } 837 } 838 839 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy, 840 EventNotifier *n, 841 unsigned int vector) 842 { 843 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 844 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq); 845 } 846 847 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy, 848 EventNotifier *n , 849 unsigned int vector) 850 { 851 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 852 int ret; 853 854 ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, irqfd->virq); 855 assert(ret == 0); 856 } 857 static int virtio_pci_get_notifier(VirtIOPCIProxy *proxy, int queue_no, 858 EventNotifier **n, unsigned int *vector) 859 { 860 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 861 VirtQueue *vq; 862 863 if (queue_no == VIRTIO_CONFIG_IRQ_IDX) { 864 *n = virtio_config_get_guest_notifier(vdev); 865 *vector = vdev->config_vector; 866 } else { 867 if (!virtio_queue_get_num(vdev, queue_no)) { 868 return -1; 869 } 870 *vector = virtio_queue_vector(vdev, queue_no); 871 vq = virtio_get_queue(vdev, queue_no); 872 *n = virtio_queue_get_guest_notifier(vq); 873 } 874 return 0; 875 } 876 877 static int kvm_virtio_pci_vector_use_one(VirtIOPCIProxy *proxy, int queue_no) 878 { 879 unsigned int vector; 880 int ret; 881 EventNotifier *n; 882 PCIDevice *dev = &proxy->pci_dev; 883 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 884 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 885 886 ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); 887 if (ret < 0) { 888 return ret; 889 } 890 if (vector >= msix_nr_vectors_allocated(dev)) { 891 return 0; 892 } 893 ret = kvm_virtio_pci_vq_vector_use(proxy, vector); 894 if (ret < 0) { 895 goto undo; 896 } 897 /* 898 * If guest supports masking, set up irqfd now. 899 * Otherwise, delay until unmasked in the frontend. 900 */ 901 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 902 ret = kvm_virtio_pci_irqfd_use(proxy, n, vector); 903 if (ret < 0) { 904 kvm_virtio_pci_vq_vector_release(proxy, vector); 905 goto undo; 906 } 907 } 908 909 return 0; 910 undo: 911 912 vector = virtio_queue_vector(vdev, queue_no); 913 if (vector >= msix_nr_vectors_allocated(dev)) { 914 return ret; 915 } 916 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 917 ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); 918 if (ret < 0) { 919 return ret; 920 } 921 kvm_virtio_pci_irqfd_release(proxy, n, vector); 922 } 923 return ret; 924 } 925 static int kvm_virtio_pci_vector_vq_use(VirtIOPCIProxy *proxy, int nvqs) 926 { 927 int queue_no; 928 int ret = 0; 929 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 930 931 for (queue_no = 0; queue_no < nvqs; queue_no++) { 932 if (!virtio_queue_get_num(vdev, queue_no)) { 933 return -1; 934 } 935 ret = kvm_virtio_pci_vector_use_one(proxy, queue_no); 936 } 937 return ret; 938 } 939 940 static int kvm_virtio_pci_vector_config_use(VirtIOPCIProxy *proxy) 941 { 942 return kvm_virtio_pci_vector_use_one(proxy, VIRTIO_CONFIG_IRQ_IDX); 943 } 944 945 static void kvm_virtio_pci_vector_release_one(VirtIOPCIProxy *proxy, 946 int queue_no) 947 { 948 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 949 unsigned int vector; 950 EventNotifier *n; 951 int ret; 952 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 953 PCIDevice *dev = &proxy->pci_dev; 954 955 ret = virtio_pci_get_notifier(proxy, queue_no, &n, &vector); 956 if (ret < 0) { 957 return; 958 } 959 if (vector >= msix_nr_vectors_allocated(dev)) { 960 return; 961 } 962 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 963 kvm_virtio_pci_irqfd_release(proxy, n, vector); 964 } 965 kvm_virtio_pci_vq_vector_release(proxy, vector); 966 } 967 968 static void kvm_virtio_pci_vector_vq_release(VirtIOPCIProxy *proxy, int nvqs) 969 { 970 int queue_no; 971 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 972 973 for (queue_no = 0; queue_no < nvqs; queue_no++) { 974 if (!virtio_queue_get_num(vdev, queue_no)) { 975 break; 976 } 977 kvm_virtio_pci_vector_release_one(proxy, queue_no); 978 } 979 } 980 981 static void kvm_virtio_pci_vector_config_release(VirtIOPCIProxy *proxy) 982 { 983 kvm_virtio_pci_vector_release_one(proxy, VIRTIO_CONFIG_IRQ_IDX); 984 } 985 986 static int virtio_pci_one_vector_unmask(VirtIOPCIProxy *proxy, 987 unsigned int queue_no, 988 unsigned int vector, 989 MSIMessage msg, 990 EventNotifier *n) 991 { 992 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 993 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 994 VirtIOIRQFD *irqfd; 995 int ret = 0; 996 997 if (proxy->vector_irqfd) { 998 irqfd = &proxy->vector_irqfd[vector]; 999 if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) { 1000 ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg, 1001 &proxy->pci_dev); 1002 if (ret < 0) { 1003 return ret; 1004 } 1005 kvm_irqchip_commit_routes(kvm_state); 1006 } 1007 } 1008 1009 /* If guest supports masking, irqfd is already setup, unmask it. 1010 * Otherwise, set it up now. 1011 */ 1012 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 1013 k->guest_notifier_mask(vdev, queue_no, false); 1014 /* Test after unmasking to avoid losing events. */ 1015 if (k->guest_notifier_pending && 1016 k->guest_notifier_pending(vdev, queue_no)) { 1017 event_notifier_set(n); 1018 } 1019 } else { 1020 ret = kvm_virtio_pci_irqfd_use(proxy, n, vector); 1021 } 1022 return ret; 1023 } 1024 1025 static void virtio_pci_one_vector_mask(VirtIOPCIProxy *proxy, 1026 unsigned int queue_no, 1027 unsigned int vector, 1028 EventNotifier *n) 1029 { 1030 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1031 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 1032 1033 /* If guest supports masking, keep irqfd but mask it. 1034 * Otherwise, clean it up now. 1035 */ 1036 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 1037 k->guest_notifier_mask(vdev, queue_no, true); 1038 } else { 1039 kvm_virtio_pci_irqfd_release(proxy, n, vector); 1040 } 1041 } 1042 1043 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector, 1044 MSIMessage msg) 1045 { 1046 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 1047 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1048 VirtQueue *vq = virtio_vector_first_queue(vdev, vector); 1049 EventNotifier *n; 1050 int ret, index, unmasked = 0; 1051 1052 while (vq) { 1053 index = virtio_get_queue_index(vq); 1054 if (!virtio_queue_get_num(vdev, index)) { 1055 break; 1056 } 1057 if (index < proxy->nvqs_with_notifiers) { 1058 n = virtio_queue_get_guest_notifier(vq); 1059 ret = virtio_pci_one_vector_unmask(proxy, index, vector, msg, n); 1060 if (ret < 0) { 1061 goto undo; 1062 } 1063 ++unmasked; 1064 } 1065 vq = virtio_vector_next_queue(vq); 1066 } 1067 /* unmask config intr */ 1068 if (vector == vdev->config_vector) { 1069 n = virtio_config_get_guest_notifier(vdev); 1070 ret = virtio_pci_one_vector_unmask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, 1071 msg, n); 1072 if (ret < 0) { 1073 goto undo_config; 1074 } 1075 } 1076 return 0; 1077 undo_config: 1078 n = virtio_config_get_guest_notifier(vdev); 1079 virtio_pci_one_vector_mask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, n); 1080 undo: 1081 vq = virtio_vector_first_queue(vdev, vector); 1082 while (vq && unmasked >= 0) { 1083 index = virtio_get_queue_index(vq); 1084 if (index < proxy->nvqs_with_notifiers) { 1085 n = virtio_queue_get_guest_notifier(vq); 1086 virtio_pci_one_vector_mask(proxy, index, vector, n); 1087 --unmasked; 1088 } 1089 vq = virtio_vector_next_queue(vq); 1090 } 1091 return ret; 1092 } 1093 1094 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector) 1095 { 1096 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 1097 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1098 VirtQueue *vq = virtio_vector_first_queue(vdev, vector); 1099 EventNotifier *n; 1100 int index; 1101 1102 while (vq) { 1103 index = virtio_get_queue_index(vq); 1104 n = virtio_queue_get_guest_notifier(vq); 1105 if (!virtio_queue_get_num(vdev, index)) { 1106 break; 1107 } 1108 if (index < proxy->nvqs_with_notifiers) { 1109 virtio_pci_one_vector_mask(proxy, index, vector, n); 1110 } 1111 vq = virtio_vector_next_queue(vq); 1112 } 1113 1114 if (vector == vdev->config_vector) { 1115 n = virtio_config_get_guest_notifier(vdev); 1116 virtio_pci_one_vector_mask(proxy, VIRTIO_CONFIG_IRQ_IDX, vector, n); 1117 } 1118 } 1119 1120 static void virtio_pci_vector_poll(PCIDevice *dev, 1121 unsigned int vector_start, 1122 unsigned int vector_end) 1123 { 1124 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 1125 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1126 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 1127 int queue_no; 1128 unsigned int vector; 1129 EventNotifier *notifier; 1130 int ret; 1131 1132 for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) { 1133 ret = virtio_pci_get_notifier(proxy, queue_no, ¬ifier, &vector); 1134 if (ret < 0) { 1135 break; 1136 } 1137 if (vector < vector_start || vector >= vector_end || 1138 !msix_is_masked(dev, vector)) { 1139 continue; 1140 } 1141 if (k->guest_notifier_pending) { 1142 if (k->guest_notifier_pending(vdev, queue_no)) { 1143 msix_set_pending(dev, vector); 1144 } 1145 } else if (event_notifier_test_and_clear(notifier)) { 1146 msix_set_pending(dev, vector); 1147 } 1148 } 1149 /* poll the config intr */ 1150 ret = virtio_pci_get_notifier(proxy, VIRTIO_CONFIG_IRQ_IDX, ¬ifier, 1151 &vector); 1152 if (ret < 0) { 1153 return; 1154 } 1155 if (vector < vector_start || vector >= vector_end || 1156 !msix_is_masked(dev, vector)) { 1157 return; 1158 } 1159 if (k->guest_notifier_pending) { 1160 if (k->guest_notifier_pending(vdev, VIRTIO_CONFIG_IRQ_IDX)) { 1161 msix_set_pending(dev, vector); 1162 } 1163 } else if (event_notifier_test_and_clear(notifier)) { 1164 msix_set_pending(dev, vector); 1165 } 1166 } 1167 1168 void virtio_pci_set_guest_notifier_fd_handler(VirtIODevice *vdev, VirtQueue *vq, 1169 int n, bool assign, 1170 bool with_irqfd) 1171 { 1172 if (n == VIRTIO_CONFIG_IRQ_IDX) { 1173 virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd); 1174 } else { 1175 virtio_queue_set_guest_notifier_fd_handler(vq, assign, with_irqfd); 1176 } 1177 } 1178 1179 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign, 1180 bool with_irqfd) 1181 { 1182 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1183 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1184 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 1185 VirtQueue *vq = NULL; 1186 EventNotifier *notifier = NULL; 1187 1188 if (n == VIRTIO_CONFIG_IRQ_IDX) { 1189 notifier = virtio_config_get_guest_notifier(vdev); 1190 } else { 1191 vq = virtio_get_queue(vdev, n); 1192 notifier = virtio_queue_get_guest_notifier(vq); 1193 } 1194 1195 if (assign) { 1196 int r = event_notifier_init(notifier, 0); 1197 if (r < 0) { 1198 return r; 1199 } 1200 virtio_pci_set_guest_notifier_fd_handler(vdev, vq, n, true, with_irqfd); 1201 } else { 1202 virtio_pci_set_guest_notifier_fd_handler(vdev, vq, n, false, 1203 with_irqfd); 1204 event_notifier_cleanup(notifier); 1205 } 1206 1207 if (!msix_enabled(&proxy->pci_dev) && 1208 vdev->use_guest_notifier_mask && 1209 vdc->guest_notifier_mask) { 1210 vdc->guest_notifier_mask(vdev, n, !assign); 1211 } 1212 1213 return 0; 1214 } 1215 1216 static bool virtio_pci_query_guest_notifiers(DeviceState *d) 1217 { 1218 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1219 return msix_enabled(&proxy->pci_dev); 1220 } 1221 1222 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign) 1223 { 1224 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1225 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1226 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 1227 int r, n; 1228 bool with_irqfd = msix_enabled(&proxy->pci_dev) && 1229 kvm_msi_via_irqfd_enabled(); 1230 1231 nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX); 1232 1233 /* 1234 * When deassigning, pass a consistent nvqs value to avoid leaking 1235 * notifiers. But first check we've actually been configured, exit 1236 * early if we haven't. 1237 */ 1238 if (!assign && !proxy->nvqs_with_notifiers) { 1239 return 0; 1240 } 1241 assert(assign || nvqs == proxy->nvqs_with_notifiers); 1242 1243 proxy->nvqs_with_notifiers = nvqs; 1244 1245 /* Must unset vector notifier while guest notifier is still assigned */ 1246 if ((proxy->vector_irqfd || 1247 (vdev->use_guest_notifier_mask && k->guest_notifier_mask)) && 1248 !assign) { 1249 msix_unset_vector_notifiers(&proxy->pci_dev); 1250 if (proxy->vector_irqfd) { 1251 kvm_virtio_pci_vector_vq_release(proxy, nvqs); 1252 kvm_virtio_pci_vector_config_release(proxy); 1253 g_free(proxy->vector_irqfd); 1254 proxy->vector_irqfd = NULL; 1255 } 1256 } 1257 1258 for (n = 0; n < nvqs; n++) { 1259 if (!virtio_queue_get_num(vdev, n)) { 1260 break; 1261 } 1262 1263 r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd); 1264 if (r < 0) { 1265 goto assign_error; 1266 } 1267 } 1268 r = virtio_pci_set_guest_notifier(d, VIRTIO_CONFIG_IRQ_IDX, assign, 1269 with_irqfd); 1270 if (r < 0) { 1271 goto config_assign_error; 1272 } 1273 /* Must set vector notifier after guest notifier has been assigned */ 1274 if ((with_irqfd || 1275 (vdev->use_guest_notifier_mask && k->guest_notifier_mask)) && 1276 assign) { 1277 if (with_irqfd) { 1278 proxy->vector_irqfd = 1279 g_malloc0(sizeof(*proxy->vector_irqfd) * 1280 msix_nr_vectors_allocated(&proxy->pci_dev)); 1281 r = kvm_virtio_pci_vector_vq_use(proxy, nvqs); 1282 if (r < 0) { 1283 goto config_assign_error; 1284 } 1285 r = kvm_virtio_pci_vector_config_use(proxy); 1286 if (r < 0) { 1287 goto config_error; 1288 } 1289 } 1290 1291 r = msix_set_vector_notifiers(&proxy->pci_dev, virtio_pci_vector_unmask, 1292 virtio_pci_vector_mask, 1293 virtio_pci_vector_poll); 1294 if (r < 0) { 1295 goto notifiers_error; 1296 } 1297 } 1298 1299 return 0; 1300 1301 notifiers_error: 1302 if (with_irqfd) { 1303 assert(assign); 1304 kvm_virtio_pci_vector_vq_release(proxy, nvqs); 1305 } 1306 config_error: 1307 if (with_irqfd) { 1308 kvm_virtio_pci_vector_config_release(proxy); 1309 } 1310 config_assign_error: 1311 virtio_pci_set_guest_notifier(d, VIRTIO_CONFIG_IRQ_IDX, !assign, 1312 with_irqfd); 1313 assign_error: 1314 /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */ 1315 assert(assign); 1316 while (--n >= 0) { 1317 virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd); 1318 } 1319 g_free(proxy->vector_irqfd); 1320 proxy->vector_irqfd = NULL; 1321 return r; 1322 } 1323 1324 static int virtio_pci_set_host_notifier_mr(DeviceState *d, int n, 1325 MemoryRegion *mr, bool assign) 1326 { 1327 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1328 int offset; 1329 1330 if (n >= VIRTIO_QUEUE_MAX || !virtio_pci_modern(proxy) || 1331 virtio_pci_queue_mem_mult(proxy) != memory_region_size(mr)) { 1332 return -1; 1333 } 1334 1335 if (assign) { 1336 offset = virtio_pci_queue_mem_mult(proxy) * n; 1337 memory_region_add_subregion_overlap(&proxy->notify.mr, offset, mr, 1); 1338 } else { 1339 memory_region_del_subregion(&proxy->notify.mr, mr); 1340 } 1341 1342 return 0; 1343 } 1344 1345 static void virtio_pci_vmstate_change(DeviceState *d, bool running) 1346 { 1347 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1348 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1349 1350 if (running) { 1351 /* Old QEMU versions did not set bus master enable on status write. 1352 * Detect DRIVER set and enable it. 1353 */ 1354 if ((proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION) && 1355 (vdev->status & VIRTIO_CONFIG_S_DRIVER) && 1356 !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) { 1357 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND, 1358 proxy->pci_dev.config[PCI_COMMAND] | 1359 PCI_COMMAND_MASTER, 1); 1360 } 1361 virtio_pci_start_ioeventfd(proxy); 1362 } else { 1363 virtio_pci_stop_ioeventfd(proxy); 1364 } 1365 } 1366 1367 /* 1368 * virtio-pci: This is the PCIDevice which has a virtio-pci-bus. 1369 */ 1370 1371 static int virtio_pci_query_nvectors(DeviceState *d) 1372 { 1373 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1374 1375 return proxy->nvectors; 1376 } 1377 1378 static AddressSpace *virtio_pci_get_dma_as(DeviceState *d) 1379 { 1380 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1381 PCIDevice *dev = &proxy->pci_dev; 1382 1383 return pci_get_address_space(dev); 1384 } 1385 1386 static bool virtio_pci_iommu_enabled(DeviceState *d) 1387 { 1388 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1389 PCIDevice *dev = &proxy->pci_dev; 1390 AddressSpace *dma_as = pci_device_iommu_address_space(dev); 1391 1392 if (dma_as == &address_space_memory) { 1393 return false; 1394 } 1395 1396 return true; 1397 } 1398 1399 static bool virtio_pci_queue_enabled(DeviceState *d, int n) 1400 { 1401 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1402 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1403 1404 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { 1405 return proxy->vqs[n].enabled; 1406 } 1407 1408 return virtio_queue_enabled_legacy(vdev, n); 1409 } 1410 1411 static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy, 1412 struct virtio_pci_cap *cap) 1413 { 1414 PCIDevice *dev = &proxy->pci_dev; 1415 int offset; 1416 1417 offset = pci_add_capability(dev, PCI_CAP_ID_VNDR, 0, 1418 cap->cap_len, &error_abort); 1419 1420 assert(cap->cap_len >= sizeof *cap); 1421 memcpy(dev->config + offset + PCI_CAP_FLAGS, &cap->cap_len, 1422 cap->cap_len - PCI_CAP_FLAGS); 1423 1424 return offset; 1425 } 1426 1427 int virtio_pci_add_shm_cap(VirtIOPCIProxy *proxy, 1428 uint8_t bar, uint64_t offset, uint64_t length, 1429 uint8_t id) 1430 { 1431 struct virtio_pci_cap64 cap = { 1432 .cap.cap_len = sizeof cap, 1433 .cap.cfg_type = VIRTIO_PCI_CAP_SHARED_MEMORY_CFG, 1434 }; 1435 1436 cap.cap.bar = bar; 1437 cap.cap.length = cpu_to_le32(length); 1438 cap.length_hi = cpu_to_le32(length >> 32); 1439 cap.cap.offset = cpu_to_le32(offset); 1440 cap.offset_hi = cpu_to_le32(offset >> 32); 1441 cap.cap.id = id; 1442 return virtio_pci_add_mem_cap(proxy, &cap.cap); 1443 } 1444 1445 static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr, 1446 unsigned size) 1447 { 1448 VirtIOPCIProxy *proxy = opaque; 1449 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1450 uint32_t val = 0; 1451 int i; 1452 1453 if (vdev == NULL) { 1454 return UINT64_MAX; 1455 } 1456 1457 switch (addr) { 1458 case VIRTIO_PCI_COMMON_DFSELECT: 1459 val = proxy->dfselect; 1460 break; 1461 case VIRTIO_PCI_COMMON_DF: 1462 if (proxy->dfselect <= 1) { 1463 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 1464 1465 val = (vdev->host_features & ~vdc->legacy_features) >> 1466 (32 * proxy->dfselect); 1467 } 1468 break; 1469 case VIRTIO_PCI_COMMON_GFSELECT: 1470 val = proxy->gfselect; 1471 break; 1472 case VIRTIO_PCI_COMMON_GF: 1473 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) { 1474 val = proxy->guest_features[proxy->gfselect]; 1475 } 1476 break; 1477 case VIRTIO_PCI_COMMON_MSIX: 1478 val = vdev->config_vector; 1479 break; 1480 case VIRTIO_PCI_COMMON_NUMQ: 1481 for (i = 0; i < VIRTIO_QUEUE_MAX; ++i) { 1482 if (virtio_queue_get_num(vdev, i)) { 1483 val = i + 1; 1484 } 1485 } 1486 break; 1487 case VIRTIO_PCI_COMMON_STATUS: 1488 val = vdev->status; 1489 break; 1490 case VIRTIO_PCI_COMMON_CFGGENERATION: 1491 val = vdev->generation; 1492 break; 1493 case VIRTIO_PCI_COMMON_Q_SELECT: 1494 val = vdev->queue_sel; 1495 break; 1496 case VIRTIO_PCI_COMMON_Q_SIZE: 1497 val = virtio_queue_get_num(vdev, vdev->queue_sel); 1498 break; 1499 case VIRTIO_PCI_COMMON_Q_MSIX: 1500 val = virtio_queue_vector(vdev, vdev->queue_sel); 1501 break; 1502 case VIRTIO_PCI_COMMON_Q_ENABLE: 1503 val = proxy->vqs[vdev->queue_sel].enabled; 1504 break; 1505 case VIRTIO_PCI_COMMON_Q_NOFF: 1506 /* Simply map queues in order */ 1507 val = vdev->queue_sel; 1508 break; 1509 case VIRTIO_PCI_COMMON_Q_DESCLO: 1510 val = proxy->vqs[vdev->queue_sel].desc[0]; 1511 break; 1512 case VIRTIO_PCI_COMMON_Q_DESCHI: 1513 val = proxy->vqs[vdev->queue_sel].desc[1]; 1514 break; 1515 case VIRTIO_PCI_COMMON_Q_AVAILLO: 1516 val = proxy->vqs[vdev->queue_sel].avail[0]; 1517 break; 1518 case VIRTIO_PCI_COMMON_Q_AVAILHI: 1519 val = proxy->vqs[vdev->queue_sel].avail[1]; 1520 break; 1521 case VIRTIO_PCI_COMMON_Q_USEDLO: 1522 val = proxy->vqs[vdev->queue_sel].used[0]; 1523 break; 1524 case VIRTIO_PCI_COMMON_Q_USEDHI: 1525 val = proxy->vqs[vdev->queue_sel].used[1]; 1526 break; 1527 case VIRTIO_PCI_COMMON_Q_RESET: 1528 val = proxy->vqs[vdev->queue_sel].reset; 1529 break; 1530 default: 1531 val = 0; 1532 } 1533 1534 return val; 1535 } 1536 1537 static void virtio_pci_common_write(void *opaque, hwaddr addr, 1538 uint64_t val, unsigned size) 1539 { 1540 VirtIOPCIProxy *proxy = opaque; 1541 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1542 uint16_t vector; 1543 1544 if (vdev == NULL) { 1545 return; 1546 } 1547 1548 switch (addr) { 1549 case VIRTIO_PCI_COMMON_DFSELECT: 1550 proxy->dfselect = val; 1551 break; 1552 case VIRTIO_PCI_COMMON_GFSELECT: 1553 proxy->gfselect = val; 1554 break; 1555 case VIRTIO_PCI_COMMON_GF: 1556 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) { 1557 proxy->guest_features[proxy->gfselect] = val; 1558 virtio_set_features(vdev, 1559 (((uint64_t)proxy->guest_features[1]) << 32) | 1560 proxy->guest_features[0]); 1561 } 1562 break; 1563 case VIRTIO_PCI_COMMON_MSIX: 1564 if (vdev->config_vector != VIRTIO_NO_VECTOR) { 1565 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector); 1566 } 1567 /* Make it possible for guest to discover an error took place. */ 1568 if (val < proxy->nvectors) { 1569 msix_vector_use(&proxy->pci_dev, val); 1570 } else { 1571 val = VIRTIO_NO_VECTOR; 1572 } 1573 vdev->config_vector = val; 1574 break; 1575 case VIRTIO_PCI_COMMON_STATUS: 1576 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) { 1577 virtio_pci_stop_ioeventfd(proxy); 1578 } 1579 1580 virtio_set_status(vdev, val & 0xFF); 1581 1582 if (val & VIRTIO_CONFIG_S_DRIVER_OK) { 1583 virtio_pci_start_ioeventfd(proxy); 1584 } 1585 1586 if (vdev->status == 0) { 1587 virtio_pci_reset(DEVICE(proxy)); 1588 } 1589 1590 break; 1591 case VIRTIO_PCI_COMMON_Q_SELECT: 1592 if (val < VIRTIO_QUEUE_MAX) { 1593 vdev->queue_sel = val; 1594 } 1595 break; 1596 case VIRTIO_PCI_COMMON_Q_SIZE: 1597 proxy->vqs[vdev->queue_sel].num = val; 1598 virtio_queue_set_num(vdev, vdev->queue_sel, 1599 proxy->vqs[vdev->queue_sel].num); 1600 virtio_init_region_cache(vdev, vdev->queue_sel); 1601 break; 1602 case VIRTIO_PCI_COMMON_Q_MSIX: 1603 vector = virtio_queue_vector(vdev, vdev->queue_sel); 1604 if (vector != VIRTIO_NO_VECTOR) { 1605 msix_vector_unuse(&proxy->pci_dev, vector); 1606 } 1607 /* Make it possible for guest to discover an error took place. */ 1608 if (val < proxy->nvectors) { 1609 msix_vector_use(&proxy->pci_dev, val); 1610 } else { 1611 val = VIRTIO_NO_VECTOR; 1612 } 1613 virtio_queue_set_vector(vdev, vdev->queue_sel, val); 1614 break; 1615 case VIRTIO_PCI_COMMON_Q_ENABLE: 1616 if (val == 1) { 1617 virtio_queue_set_num(vdev, vdev->queue_sel, 1618 proxy->vqs[vdev->queue_sel].num); 1619 virtio_queue_set_rings(vdev, vdev->queue_sel, 1620 ((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 | 1621 proxy->vqs[vdev->queue_sel].desc[0], 1622 ((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 | 1623 proxy->vqs[vdev->queue_sel].avail[0], 1624 ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 | 1625 proxy->vqs[vdev->queue_sel].used[0]); 1626 proxy->vqs[vdev->queue_sel].enabled = 1; 1627 proxy->vqs[vdev->queue_sel].reset = 0; 1628 virtio_queue_enable(vdev, vdev->queue_sel); 1629 } else { 1630 virtio_error(vdev, "wrong value for queue_enable %"PRIx64, val); 1631 } 1632 break; 1633 case VIRTIO_PCI_COMMON_Q_DESCLO: 1634 proxy->vqs[vdev->queue_sel].desc[0] = val; 1635 break; 1636 case VIRTIO_PCI_COMMON_Q_DESCHI: 1637 proxy->vqs[vdev->queue_sel].desc[1] = val; 1638 break; 1639 case VIRTIO_PCI_COMMON_Q_AVAILLO: 1640 proxy->vqs[vdev->queue_sel].avail[0] = val; 1641 break; 1642 case VIRTIO_PCI_COMMON_Q_AVAILHI: 1643 proxy->vqs[vdev->queue_sel].avail[1] = val; 1644 break; 1645 case VIRTIO_PCI_COMMON_Q_USEDLO: 1646 proxy->vqs[vdev->queue_sel].used[0] = val; 1647 break; 1648 case VIRTIO_PCI_COMMON_Q_USEDHI: 1649 proxy->vqs[vdev->queue_sel].used[1] = val; 1650 break; 1651 case VIRTIO_PCI_COMMON_Q_RESET: 1652 if (val == 1) { 1653 proxy->vqs[vdev->queue_sel].reset = 1; 1654 1655 virtio_queue_reset(vdev, vdev->queue_sel); 1656 1657 proxy->vqs[vdev->queue_sel].reset = 0; 1658 proxy->vqs[vdev->queue_sel].enabled = 0; 1659 } 1660 break; 1661 default: 1662 break; 1663 } 1664 } 1665 1666 1667 static uint64_t virtio_pci_notify_read(void *opaque, hwaddr addr, 1668 unsigned size) 1669 { 1670 VirtIOPCIProxy *proxy = opaque; 1671 if (virtio_bus_get_device(&proxy->bus) == NULL) { 1672 return UINT64_MAX; 1673 } 1674 1675 return 0; 1676 } 1677 1678 static void virtio_pci_notify_write(void *opaque, hwaddr addr, 1679 uint64_t val, unsigned size) 1680 { 1681 VirtIOPCIProxy *proxy = opaque; 1682 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1683 1684 unsigned queue = addr / virtio_pci_queue_mem_mult(proxy); 1685 1686 if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) { 1687 trace_virtio_pci_notify_write(addr, val, size); 1688 virtio_queue_notify(vdev, queue); 1689 } 1690 } 1691 1692 static void virtio_pci_notify_write_pio(void *opaque, hwaddr addr, 1693 uint64_t val, unsigned size) 1694 { 1695 VirtIOPCIProxy *proxy = opaque; 1696 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1697 1698 unsigned queue = val; 1699 1700 if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) { 1701 trace_virtio_pci_notify_write_pio(addr, val, size); 1702 virtio_queue_notify(vdev, queue); 1703 } 1704 } 1705 1706 static uint64_t virtio_pci_isr_read(void *opaque, hwaddr addr, 1707 unsigned size) 1708 { 1709 VirtIOPCIProxy *proxy = opaque; 1710 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1711 uint64_t val; 1712 1713 if (vdev == NULL) { 1714 return UINT64_MAX; 1715 } 1716 1717 val = qatomic_xchg(&vdev->isr, 0); 1718 pci_irq_deassert(&proxy->pci_dev); 1719 return val; 1720 } 1721 1722 static void virtio_pci_isr_write(void *opaque, hwaddr addr, 1723 uint64_t val, unsigned size) 1724 { 1725 } 1726 1727 static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr, 1728 unsigned size) 1729 { 1730 VirtIOPCIProxy *proxy = opaque; 1731 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1732 uint64_t val; 1733 1734 if (vdev == NULL) { 1735 return UINT64_MAX; 1736 } 1737 1738 switch (size) { 1739 case 1: 1740 val = virtio_config_modern_readb(vdev, addr); 1741 break; 1742 case 2: 1743 val = virtio_config_modern_readw(vdev, addr); 1744 break; 1745 case 4: 1746 val = virtio_config_modern_readl(vdev, addr); 1747 break; 1748 default: 1749 val = 0; 1750 break; 1751 } 1752 return val; 1753 } 1754 1755 static void virtio_pci_device_write(void *opaque, hwaddr addr, 1756 uint64_t val, unsigned size) 1757 { 1758 VirtIOPCIProxy *proxy = opaque; 1759 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1760 1761 if (vdev == NULL) { 1762 return; 1763 } 1764 1765 switch (size) { 1766 case 1: 1767 virtio_config_modern_writeb(vdev, addr, val); 1768 break; 1769 case 2: 1770 virtio_config_modern_writew(vdev, addr, val); 1771 break; 1772 case 4: 1773 virtio_config_modern_writel(vdev, addr, val); 1774 break; 1775 } 1776 } 1777 1778 static void virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy, 1779 const char *vdev_name) 1780 { 1781 static const MemoryRegionOps common_ops = { 1782 .read = virtio_pci_common_read, 1783 .write = virtio_pci_common_write, 1784 .impl = { 1785 .min_access_size = 1, 1786 .max_access_size = 4, 1787 }, 1788 .endianness = DEVICE_LITTLE_ENDIAN, 1789 }; 1790 static const MemoryRegionOps isr_ops = { 1791 .read = virtio_pci_isr_read, 1792 .write = virtio_pci_isr_write, 1793 .impl = { 1794 .min_access_size = 1, 1795 .max_access_size = 4, 1796 }, 1797 .endianness = DEVICE_LITTLE_ENDIAN, 1798 }; 1799 static const MemoryRegionOps device_ops = { 1800 .read = virtio_pci_device_read, 1801 .write = virtio_pci_device_write, 1802 .impl = { 1803 .min_access_size = 1, 1804 .max_access_size = 4, 1805 }, 1806 .endianness = DEVICE_LITTLE_ENDIAN, 1807 }; 1808 static const MemoryRegionOps notify_ops = { 1809 .read = virtio_pci_notify_read, 1810 .write = virtio_pci_notify_write, 1811 .impl = { 1812 .min_access_size = 1, 1813 .max_access_size = 4, 1814 }, 1815 .endianness = DEVICE_LITTLE_ENDIAN, 1816 }; 1817 static const MemoryRegionOps notify_pio_ops = { 1818 .read = virtio_pci_notify_read, 1819 .write = virtio_pci_notify_write_pio, 1820 .impl = { 1821 .min_access_size = 1, 1822 .max_access_size = 4, 1823 }, 1824 .endianness = DEVICE_LITTLE_ENDIAN, 1825 }; 1826 g_autoptr(GString) name = g_string_new(NULL); 1827 1828 g_string_printf(name, "virtio-pci-common-%s", vdev_name); 1829 memory_region_init_io(&proxy->common.mr, OBJECT(proxy), 1830 &common_ops, 1831 proxy, 1832 name->str, 1833 proxy->common.size); 1834 1835 g_string_printf(name, "virtio-pci-isr-%s", vdev_name); 1836 memory_region_init_io(&proxy->isr.mr, OBJECT(proxy), 1837 &isr_ops, 1838 proxy, 1839 name->str, 1840 proxy->isr.size); 1841 1842 g_string_printf(name, "virtio-pci-device-%s", vdev_name); 1843 memory_region_init_io(&proxy->device.mr, OBJECT(proxy), 1844 &device_ops, 1845 proxy, 1846 name->str, 1847 proxy->device.size); 1848 1849 g_string_printf(name, "virtio-pci-notify-%s", vdev_name); 1850 memory_region_init_io(&proxy->notify.mr, OBJECT(proxy), 1851 ¬ify_ops, 1852 proxy, 1853 name->str, 1854 proxy->notify.size); 1855 1856 g_string_printf(name, "virtio-pci-notify-pio-%s", vdev_name); 1857 memory_region_init_io(&proxy->notify_pio.mr, OBJECT(proxy), 1858 ¬ify_pio_ops, 1859 proxy, 1860 name->str, 1861 proxy->notify_pio.size); 1862 } 1863 1864 static void virtio_pci_modern_region_map(VirtIOPCIProxy *proxy, 1865 VirtIOPCIRegion *region, 1866 struct virtio_pci_cap *cap, 1867 MemoryRegion *mr, 1868 uint8_t bar) 1869 { 1870 memory_region_add_subregion(mr, region->offset, ®ion->mr); 1871 1872 cap->cfg_type = region->type; 1873 cap->bar = bar; 1874 cap->offset = cpu_to_le32(region->offset); 1875 cap->length = cpu_to_le32(region->size); 1876 virtio_pci_add_mem_cap(proxy, cap); 1877 1878 } 1879 1880 static void virtio_pci_modern_mem_region_map(VirtIOPCIProxy *proxy, 1881 VirtIOPCIRegion *region, 1882 struct virtio_pci_cap *cap) 1883 { 1884 virtio_pci_modern_region_map(proxy, region, cap, 1885 &proxy->modern_bar, proxy->modern_mem_bar_idx); 1886 } 1887 1888 static void virtio_pci_modern_io_region_map(VirtIOPCIProxy *proxy, 1889 VirtIOPCIRegion *region, 1890 struct virtio_pci_cap *cap) 1891 { 1892 virtio_pci_modern_region_map(proxy, region, cap, 1893 &proxy->io_bar, proxy->modern_io_bar_idx); 1894 } 1895 1896 static void virtio_pci_modern_mem_region_unmap(VirtIOPCIProxy *proxy, 1897 VirtIOPCIRegion *region) 1898 { 1899 memory_region_del_subregion(&proxy->modern_bar, 1900 ®ion->mr); 1901 } 1902 1903 static void virtio_pci_modern_io_region_unmap(VirtIOPCIProxy *proxy, 1904 VirtIOPCIRegion *region) 1905 { 1906 memory_region_del_subregion(&proxy->io_bar, 1907 ®ion->mr); 1908 } 1909 1910 static void virtio_pci_pre_plugged(DeviceState *d, Error **errp) 1911 { 1912 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1913 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1914 1915 if (virtio_pci_modern(proxy)) { 1916 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 1917 } 1918 1919 virtio_add_feature(&vdev->host_features, VIRTIO_F_BAD_FEATURE); 1920 } 1921 1922 /* This is called by virtio-bus just after the device is plugged. */ 1923 static void virtio_pci_device_plugged(DeviceState *d, Error **errp) 1924 { 1925 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1926 VirtioBusState *bus = &proxy->bus; 1927 bool legacy = virtio_pci_legacy(proxy); 1928 bool modern; 1929 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 1930 uint8_t *config; 1931 uint32_t size; 1932 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1933 1934 /* 1935 * Virtio capabilities present without 1936 * VIRTIO_F_VERSION_1 confuses guests 1937 */ 1938 if (!proxy->ignore_backend_features && 1939 !virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) { 1940 virtio_pci_disable_modern(proxy); 1941 1942 if (!legacy) { 1943 error_setg(errp, "Device doesn't support modern mode, and legacy" 1944 " mode is disabled"); 1945 error_append_hint(errp, "Set disable-legacy to off\n"); 1946 1947 return; 1948 } 1949 } 1950 1951 modern = virtio_pci_modern(proxy); 1952 1953 config = proxy->pci_dev.config; 1954 if (proxy->class_code) { 1955 pci_config_set_class(config, proxy->class_code); 1956 } 1957 1958 if (legacy) { 1959 if (!virtio_legacy_allowed(vdev)) { 1960 /* 1961 * To avoid migration issues, we allow legacy mode when legacy 1962 * check is disabled in the old machine types (< 5.1). 1963 */ 1964 if (virtio_legacy_check_disabled(vdev)) { 1965 warn_report("device is modern-only, but for backward " 1966 "compatibility legacy is allowed"); 1967 } else { 1968 error_setg(errp, 1969 "device is modern-only, use disable-legacy=on"); 1970 return; 1971 } 1972 } 1973 if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) { 1974 error_setg(errp, "VIRTIO_F_IOMMU_PLATFORM was supported by" 1975 " neither legacy nor transitional device"); 1976 return; 1977 } 1978 /* 1979 * Legacy and transitional devices use specific subsystem IDs. 1980 * Note that the subsystem vendor ID (config + PCI_SUBSYSTEM_VENDOR_ID) 1981 * is set to PCI_SUBVENDOR_ID_REDHAT_QUMRANET by default. 1982 */ 1983 pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus)); 1984 if (proxy->trans_devid) { 1985 pci_config_set_device_id(config, proxy->trans_devid); 1986 } 1987 } else { 1988 /* pure virtio-1.0 */ 1989 pci_set_word(config + PCI_VENDOR_ID, 1990 PCI_VENDOR_ID_REDHAT_QUMRANET); 1991 pci_set_word(config + PCI_DEVICE_ID, 1992 PCI_DEVICE_ID_VIRTIO_10_BASE + virtio_bus_get_vdev_id(bus)); 1993 pci_config_set_revision(config, 1); 1994 } 1995 config[PCI_INTERRUPT_PIN] = 1; 1996 1997 1998 if (modern) { 1999 struct virtio_pci_cap cap = { 2000 .cap_len = sizeof cap, 2001 }; 2002 struct virtio_pci_notify_cap notify = { 2003 .cap.cap_len = sizeof notify, 2004 .notify_off_multiplier = 2005 cpu_to_le32(virtio_pci_queue_mem_mult(proxy)), 2006 }; 2007 struct virtio_pci_cfg_cap cfg = { 2008 .cap.cap_len = sizeof cfg, 2009 .cap.cfg_type = VIRTIO_PCI_CAP_PCI_CFG, 2010 }; 2011 struct virtio_pci_notify_cap notify_pio = { 2012 .cap.cap_len = sizeof notify, 2013 .notify_off_multiplier = cpu_to_le32(0x0), 2014 }; 2015 2016 struct virtio_pci_cfg_cap *cfg_mask; 2017 2018 virtio_pci_modern_regions_init(proxy, vdev->name); 2019 2020 virtio_pci_modern_mem_region_map(proxy, &proxy->common, &cap); 2021 virtio_pci_modern_mem_region_map(proxy, &proxy->isr, &cap); 2022 virtio_pci_modern_mem_region_map(proxy, &proxy->device, &cap); 2023 virtio_pci_modern_mem_region_map(proxy, &proxy->notify, ¬ify.cap); 2024 2025 if (modern_pio) { 2026 memory_region_init(&proxy->io_bar, OBJECT(proxy), 2027 "virtio-pci-io", 0x4); 2028 2029 pci_register_bar(&proxy->pci_dev, proxy->modern_io_bar_idx, 2030 PCI_BASE_ADDRESS_SPACE_IO, &proxy->io_bar); 2031 2032 virtio_pci_modern_io_region_map(proxy, &proxy->notify_pio, 2033 ¬ify_pio.cap); 2034 } 2035 2036 pci_register_bar(&proxy->pci_dev, proxy->modern_mem_bar_idx, 2037 PCI_BASE_ADDRESS_SPACE_MEMORY | 2038 PCI_BASE_ADDRESS_MEM_PREFETCH | 2039 PCI_BASE_ADDRESS_MEM_TYPE_64, 2040 &proxy->modern_bar); 2041 2042 proxy->config_cap = virtio_pci_add_mem_cap(proxy, &cfg.cap); 2043 cfg_mask = (void *)(proxy->pci_dev.wmask + proxy->config_cap); 2044 pci_set_byte(&cfg_mask->cap.bar, ~0x0); 2045 pci_set_long((uint8_t *)&cfg_mask->cap.offset, ~0x0); 2046 pci_set_long((uint8_t *)&cfg_mask->cap.length, ~0x0); 2047 pci_set_long(cfg_mask->pci_cfg_data, ~0x0); 2048 } 2049 2050 if (proxy->nvectors) { 2051 int err = msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 2052 proxy->msix_bar_idx, NULL); 2053 if (err) { 2054 /* Notice when a system that supports MSIx can't initialize it */ 2055 if (err != -ENOTSUP) { 2056 warn_report("unable to init msix vectors to %" PRIu32, 2057 proxy->nvectors); 2058 } 2059 proxy->nvectors = 0; 2060 } 2061 } 2062 2063 proxy->pci_dev.config_write = virtio_write_config; 2064 proxy->pci_dev.config_read = virtio_read_config; 2065 2066 if (legacy) { 2067 size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) 2068 + virtio_bus_get_vdev_config_len(bus); 2069 size = pow2ceil(size); 2070 2071 memory_region_init_io(&proxy->bar, OBJECT(proxy), 2072 &virtio_pci_config_ops, 2073 proxy, "virtio-pci", size); 2074 2075 pci_register_bar(&proxy->pci_dev, proxy->legacy_io_bar_idx, 2076 PCI_BASE_ADDRESS_SPACE_IO, &proxy->bar); 2077 } 2078 } 2079 2080 static void virtio_pci_device_unplugged(DeviceState *d) 2081 { 2082 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 2083 bool modern = virtio_pci_modern(proxy); 2084 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 2085 2086 virtio_pci_stop_ioeventfd(proxy); 2087 2088 if (modern) { 2089 virtio_pci_modern_mem_region_unmap(proxy, &proxy->common); 2090 virtio_pci_modern_mem_region_unmap(proxy, &proxy->isr); 2091 virtio_pci_modern_mem_region_unmap(proxy, &proxy->device); 2092 virtio_pci_modern_mem_region_unmap(proxy, &proxy->notify); 2093 if (modern_pio) { 2094 virtio_pci_modern_io_region_unmap(proxy, &proxy->notify_pio); 2095 } 2096 } 2097 } 2098 2099 static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp) 2100 { 2101 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 2102 VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev); 2103 bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) && 2104 !pci_bus_is_root(pci_get_bus(pci_dev)); 2105 2106 /* fd-based ioevents can't be synchronized in record/replay */ 2107 if (replay_mode != REPLAY_MODE_NONE) { 2108 proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD; 2109 } 2110 2111 /* 2112 * virtio pci bar layout used by default. 2113 * subclasses can re-arrange things if needed. 2114 * 2115 * region 0 -- virtio legacy io bar 2116 * region 1 -- msi-x bar 2117 * region 2 -- virtio modern io bar (off by default) 2118 * region 4+5 -- virtio modern memory (64bit) bar 2119 * 2120 */ 2121 proxy->legacy_io_bar_idx = 0; 2122 proxy->msix_bar_idx = 1; 2123 proxy->modern_io_bar_idx = 2; 2124 proxy->modern_mem_bar_idx = 4; 2125 2126 proxy->common.offset = 0x0; 2127 proxy->common.size = 0x1000; 2128 proxy->common.type = VIRTIO_PCI_CAP_COMMON_CFG; 2129 2130 proxy->isr.offset = 0x1000; 2131 proxy->isr.size = 0x1000; 2132 proxy->isr.type = VIRTIO_PCI_CAP_ISR_CFG; 2133 2134 proxy->device.offset = 0x2000; 2135 proxy->device.size = 0x1000; 2136 proxy->device.type = VIRTIO_PCI_CAP_DEVICE_CFG; 2137 2138 proxy->notify.offset = 0x3000; 2139 proxy->notify.size = virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX; 2140 proxy->notify.type = VIRTIO_PCI_CAP_NOTIFY_CFG; 2141 2142 proxy->notify_pio.offset = 0x0; 2143 proxy->notify_pio.size = 0x4; 2144 proxy->notify_pio.type = VIRTIO_PCI_CAP_NOTIFY_CFG; 2145 2146 /* subclasses can enforce modern, so do this unconditionally */ 2147 memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci", 2148 /* PCI BAR regions must be powers of 2 */ 2149 pow2ceil(proxy->notify.offset + proxy->notify.size)); 2150 2151 if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) { 2152 proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF; 2153 } 2154 2155 if (!virtio_pci_modern(proxy) && !virtio_pci_legacy(proxy)) { 2156 error_setg(errp, "device cannot work as neither modern nor legacy mode" 2157 " is enabled"); 2158 error_append_hint(errp, "Set either disable-modern or disable-legacy" 2159 " to off\n"); 2160 return; 2161 } 2162 2163 if (pcie_port && pci_is_express(pci_dev)) { 2164 int pos; 2165 uint16_t last_pcie_cap_offset = PCI_CONFIG_SPACE_SIZE; 2166 2167 pos = pcie_endpoint_cap_init(pci_dev, 0); 2168 assert(pos > 0); 2169 2170 pos = pci_add_capability(pci_dev, PCI_CAP_ID_PM, 0, 2171 PCI_PM_SIZEOF, errp); 2172 if (pos < 0) { 2173 return; 2174 } 2175 2176 pci_dev->exp.pm_cap = pos; 2177 2178 /* 2179 * Indicates that this function complies with revision 1.2 of the 2180 * PCI Power Management Interface Specification. 2181 */ 2182 pci_set_word(pci_dev->config + pos + PCI_PM_PMC, 0x3); 2183 2184 if (proxy->flags & VIRTIO_PCI_FLAG_AER) { 2185 pcie_aer_init(pci_dev, PCI_ERR_VER, last_pcie_cap_offset, 2186 PCI_ERR_SIZEOF, NULL); 2187 last_pcie_cap_offset += PCI_ERR_SIZEOF; 2188 } 2189 2190 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_DEVERR) { 2191 /* Init error enabling flags */ 2192 pcie_cap_deverr_init(pci_dev); 2193 } 2194 2195 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_LNKCTL) { 2196 /* Init Link Control Register */ 2197 pcie_cap_lnkctl_init(pci_dev); 2198 } 2199 2200 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_PM) { 2201 /* Init Power Management Control Register */ 2202 pci_set_word(pci_dev->wmask + pos + PCI_PM_CTRL, 2203 PCI_PM_CTRL_STATE_MASK); 2204 } 2205 2206 if (proxy->flags & VIRTIO_PCI_FLAG_ATS) { 2207 pcie_ats_init(pci_dev, last_pcie_cap_offset, 2208 proxy->flags & VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED); 2209 last_pcie_cap_offset += PCI_EXT_CAP_ATS_SIZEOF; 2210 } 2211 2212 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) { 2213 /* Set Function Level Reset capability bit */ 2214 pcie_cap_flr_init(pci_dev); 2215 } 2216 } else { 2217 /* 2218 * make future invocations of pci_is_express() return false 2219 * and pci_config_size() return PCI_CONFIG_SPACE_SIZE. 2220 */ 2221 pci_dev->cap_present &= ~QEMU_PCI_CAP_EXPRESS; 2222 } 2223 2224 virtio_pci_bus_new(&proxy->bus, sizeof(proxy->bus), proxy); 2225 if (k->realize) { 2226 k->realize(proxy, errp); 2227 } 2228 } 2229 2230 static void virtio_pci_exit(PCIDevice *pci_dev) 2231 { 2232 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 2233 bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) && 2234 !pci_bus_is_root(pci_get_bus(pci_dev)); 2235 2236 msix_uninit_exclusive_bar(pci_dev); 2237 if (proxy->flags & VIRTIO_PCI_FLAG_AER && pcie_port && 2238 pci_is_express(pci_dev)) { 2239 pcie_aer_exit(pci_dev); 2240 } 2241 } 2242 2243 static void virtio_pci_reset(DeviceState *qdev) 2244 { 2245 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev); 2246 VirtioBusState *bus = VIRTIO_BUS(&proxy->bus); 2247 int i; 2248 2249 virtio_bus_reset(bus); 2250 msix_unuse_all_vectors(&proxy->pci_dev); 2251 2252 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { 2253 proxy->vqs[i].enabled = 0; 2254 proxy->vqs[i].reset = 0; 2255 proxy->vqs[i].num = 0; 2256 proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0; 2257 proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0; 2258 proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0; 2259 } 2260 } 2261 2262 static void virtio_pci_bus_reset_hold(Object *obj) 2263 { 2264 PCIDevice *dev = PCI_DEVICE(obj); 2265 DeviceState *qdev = DEVICE(obj); 2266 2267 virtio_pci_reset(qdev); 2268 2269 if (pci_is_express(dev)) { 2270 pcie_cap_deverr_reset(dev); 2271 pcie_cap_lnkctl_reset(dev); 2272 2273 pci_set_word(dev->config + dev->exp.pm_cap + PCI_PM_CTRL, 0); 2274 } 2275 } 2276 2277 static Property virtio_pci_properties[] = { 2278 DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy, flags, 2279 VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT, false), 2280 DEFINE_PROP_BIT("migrate-extra", VirtIOPCIProxy, flags, 2281 VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT, true), 2282 DEFINE_PROP_BIT("modern-pio-notify", VirtIOPCIProxy, flags, 2283 VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT, false), 2284 DEFINE_PROP_BIT("x-disable-pcie", VirtIOPCIProxy, flags, 2285 VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT, false), 2286 DEFINE_PROP_BIT("page-per-vq", VirtIOPCIProxy, flags, 2287 VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT, false), 2288 DEFINE_PROP_BOOL("x-ignore-backend-features", VirtIOPCIProxy, 2289 ignore_backend_features, false), 2290 DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags, 2291 VIRTIO_PCI_FLAG_ATS_BIT, false), 2292 DEFINE_PROP_BIT("x-ats-page-aligned", VirtIOPCIProxy, flags, 2293 VIRTIO_PCI_FLAG_ATS_PAGE_ALIGNED_BIT, true), 2294 DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy, flags, 2295 VIRTIO_PCI_FLAG_INIT_DEVERR_BIT, true), 2296 DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy, flags, 2297 VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT, true), 2298 DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy, flags, 2299 VIRTIO_PCI_FLAG_INIT_PM_BIT, true), 2300 DEFINE_PROP_BIT("x-pcie-flr-init", VirtIOPCIProxy, flags, 2301 VIRTIO_PCI_FLAG_INIT_FLR_BIT, true), 2302 DEFINE_PROP_BIT("aer", VirtIOPCIProxy, flags, 2303 VIRTIO_PCI_FLAG_AER_BIT, false), 2304 DEFINE_PROP_END_OF_LIST(), 2305 }; 2306 2307 static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp) 2308 { 2309 VirtioPCIClass *vpciklass = VIRTIO_PCI_GET_CLASS(qdev); 2310 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev); 2311 PCIDevice *pci_dev = &proxy->pci_dev; 2312 2313 if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) && 2314 virtio_pci_modern(proxy)) { 2315 pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS; 2316 } 2317 2318 vpciklass->parent_dc_realize(qdev, errp); 2319 } 2320 2321 static void virtio_pci_class_init(ObjectClass *klass, void *data) 2322 { 2323 DeviceClass *dc = DEVICE_CLASS(klass); 2324 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 2325 VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass); 2326 ResettableClass *rc = RESETTABLE_CLASS(klass); 2327 2328 device_class_set_props(dc, virtio_pci_properties); 2329 k->realize = virtio_pci_realize; 2330 k->exit = virtio_pci_exit; 2331 k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; 2332 k->revision = VIRTIO_PCI_ABI_VERSION; 2333 k->class_id = PCI_CLASS_OTHERS; 2334 device_class_set_parent_realize(dc, virtio_pci_dc_realize, 2335 &vpciklass->parent_dc_realize); 2336 rc->phases.hold = virtio_pci_bus_reset_hold; 2337 } 2338 2339 static const TypeInfo virtio_pci_info = { 2340 .name = TYPE_VIRTIO_PCI, 2341 .parent = TYPE_PCI_DEVICE, 2342 .instance_size = sizeof(VirtIOPCIProxy), 2343 .class_init = virtio_pci_class_init, 2344 .class_size = sizeof(VirtioPCIClass), 2345 .abstract = true, 2346 }; 2347 2348 static Property virtio_pci_generic_properties[] = { 2349 DEFINE_PROP_ON_OFF_AUTO("disable-legacy", VirtIOPCIProxy, disable_legacy, 2350 ON_OFF_AUTO_AUTO), 2351 DEFINE_PROP_BOOL("disable-modern", VirtIOPCIProxy, disable_modern, false), 2352 DEFINE_PROP_END_OF_LIST(), 2353 }; 2354 2355 static void virtio_pci_base_class_init(ObjectClass *klass, void *data) 2356 { 2357 const VirtioPCIDeviceTypeInfo *t = data; 2358 if (t->class_init) { 2359 t->class_init(klass, NULL); 2360 } 2361 } 2362 2363 static void virtio_pci_generic_class_init(ObjectClass *klass, void *data) 2364 { 2365 DeviceClass *dc = DEVICE_CLASS(klass); 2366 2367 device_class_set_props(dc, virtio_pci_generic_properties); 2368 } 2369 2370 static void virtio_pci_transitional_instance_init(Object *obj) 2371 { 2372 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj); 2373 2374 proxy->disable_legacy = ON_OFF_AUTO_OFF; 2375 proxy->disable_modern = false; 2376 } 2377 2378 static void virtio_pci_non_transitional_instance_init(Object *obj) 2379 { 2380 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj); 2381 2382 proxy->disable_legacy = ON_OFF_AUTO_ON; 2383 proxy->disable_modern = false; 2384 } 2385 2386 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t) 2387 { 2388 char *base_name = NULL; 2389 TypeInfo base_type_info = { 2390 .name = t->base_name, 2391 .parent = t->parent ? t->parent : TYPE_VIRTIO_PCI, 2392 .instance_size = t->instance_size, 2393 .instance_init = t->instance_init, 2394 .instance_finalize = t->instance_finalize, 2395 .class_size = t->class_size, 2396 .abstract = true, 2397 .interfaces = t->interfaces, 2398 }; 2399 TypeInfo generic_type_info = { 2400 .name = t->generic_name, 2401 .parent = base_type_info.name, 2402 .class_init = virtio_pci_generic_class_init, 2403 .interfaces = (InterfaceInfo[]) { 2404 { INTERFACE_PCIE_DEVICE }, 2405 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 2406 { } 2407 }, 2408 }; 2409 2410 if (!base_type_info.name) { 2411 /* No base type -> register a single generic device type */ 2412 /* use intermediate %s-base-type to add generic device props */ 2413 base_name = g_strdup_printf("%s-base-type", t->generic_name); 2414 base_type_info.name = base_name; 2415 base_type_info.class_init = virtio_pci_generic_class_init; 2416 2417 generic_type_info.parent = base_name; 2418 generic_type_info.class_init = virtio_pci_base_class_init; 2419 generic_type_info.class_data = (void *)t; 2420 2421 assert(!t->non_transitional_name); 2422 assert(!t->transitional_name); 2423 } else { 2424 base_type_info.class_init = virtio_pci_base_class_init; 2425 base_type_info.class_data = (void *)t; 2426 } 2427 2428 type_register(&base_type_info); 2429 if (generic_type_info.name) { 2430 type_register(&generic_type_info); 2431 } 2432 2433 if (t->non_transitional_name) { 2434 const TypeInfo non_transitional_type_info = { 2435 .name = t->non_transitional_name, 2436 .parent = base_type_info.name, 2437 .instance_init = virtio_pci_non_transitional_instance_init, 2438 .interfaces = (InterfaceInfo[]) { 2439 { INTERFACE_PCIE_DEVICE }, 2440 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 2441 { } 2442 }, 2443 }; 2444 type_register(&non_transitional_type_info); 2445 } 2446 2447 if (t->transitional_name) { 2448 const TypeInfo transitional_type_info = { 2449 .name = t->transitional_name, 2450 .parent = base_type_info.name, 2451 .instance_init = virtio_pci_transitional_instance_init, 2452 .interfaces = (InterfaceInfo[]) { 2453 /* 2454 * Transitional virtio devices work only as Conventional PCI 2455 * devices because they require PIO ports. 2456 */ 2457 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 2458 { } 2459 }, 2460 }; 2461 type_register(&transitional_type_info); 2462 } 2463 g_free(base_name); 2464 } 2465 2466 unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues) 2467 { 2468 /* 2469 * 1:1 vq to vCPU mapping is ideal because the same vCPU that submitted 2470 * virtqueue buffers can handle their completion. When a different vCPU 2471 * handles completion it may need to IPI the vCPU that submitted the 2472 * request and this adds overhead. 2473 * 2474 * Virtqueues consume guest RAM and MSI-X vectors. This is wasteful in 2475 * guests with very many vCPUs and a device that is only used by a few 2476 * vCPUs. Unfortunately optimizing that case requires manual pinning inside 2477 * the guest, so those users might as well manually set the number of 2478 * queues. There is no upper limit that can be applied automatically and 2479 * doing so arbitrarily would result in a sudden performance drop once the 2480 * threshold number of vCPUs is exceeded. 2481 */ 2482 unsigned num_queues = current_machine->smp.cpus; 2483 2484 /* 2485 * The maximum number of MSI-X vectors is PCI_MSIX_FLAGS_QSIZE + 1, but the 2486 * config change interrupt and the fixed virtqueues must be taken into 2487 * account too. 2488 */ 2489 num_queues = MIN(num_queues, PCI_MSIX_FLAGS_QSIZE - fixed_queues); 2490 2491 /* 2492 * There is a limit to how many virtqueues a device can have. 2493 */ 2494 return MIN(num_queues, VIRTIO_QUEUE_MAX - fixed_queues); 2495 } 2496 2497 /* virtio-pci-bus */ 2498 2499 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size, 2500 VirtIOPCIProxy *dev) 2501 { 2502 DeviceState *qdev = DEVICE(dev); 2503 char virtio_bus_name[] = "virtio-bus"; 2504 2505 qbus_init(bus, bus_size, TYPE_VIRTIO_PCI_BUS, qdev, virtio_bus_name); 2506 } 2507 2508 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data) 2509 { 2510 BusClass *bus_class = BUS_CLASS(klass); 2511 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 2512 bus_class->max_dev = 1; 2513 k->notify = virtio_pci_notify; 2514 k->save_config = virtio_pci_save_config; 2515 k->load_config = virtio_pci_load_config; 2516 k->save_queue = virtio_pci_save_queue; 2517 k->load_queue = virtio_pci_load_queue; 2518 k->save_extra_state = virtio_pci_save_extra_state; 2519 k->load_extra_state = virtio_pci_load_extra_state; 2520 k->has_extra_state = virtio_pci_has_extra_state; 2521 k->query_guest_notifiers = virtio_pci_query_guest_notifiers; 2522 k->set_guest_notifiers = virtio_pci_set_guest_notifiers; 2523 k->set_host_notifier_mr = virtio_pci_set_host_notifier_mr; 2524 k->vmstate_change = virtio_pci_vmstate_change; 2525 k->pre_plugged = virtio_pci_pre_plugged; 2526 k->device_plugged = virtio_pci_device_plugged; 2527 k->device_unplugged = virtio_pci_device_unplugged; 2528 k->query_nvectors = virtio_pci_query_nvectors; 2529 k->ioeventfd_enabled = virtio_pci_ioeventfd_enabled; 2530 k->ioeventfd_assign = virtio_pci_ioeventfd_assign; 2531 k->get_dma_as = virtio_pci_get_dma_as; 2532 k->iommu_enabled = virtio_pci_iommu_enabled; 2533 k->queue_enabled = virtio_pci_queue_enabled; 2534 } 2535 2536 static const TypeInfo virtio_pci_bus_info = { 2537 .name = TYPE_VIRTIO_PCI_BUS, 2538 .parent = TYPE_VIRTIO_BUS, 2539 .instance_size = sizeof(VirtioPCIBusState), 2540 .class_size = sizeof(VirtioPCIBusClass), 2541 .class_init = virtio_pci_bus_class_init, 2542 }; 2543 2544 static void virtio_pci_register_types(void) 2545 { 2546 /* Base types: */ 2547 type_register_static(&virtio_pci_bus_info); 2548 type_register_static(&virtio_pci_info); 2549 } 2550 2551 type_init(virtio_pci_register_types) 2552 2553