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