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 "hw/boards.h" 23 #include "hw/virtio/virtio.h" 24 #include "migration/qemu-file-types.h" 25 #include "hw/pci/pci.h" 26 #include "hw/pci/pci_bus.h" 27 #include "hw/qdev-properties.h" 28 #include "qapi/error.h" 29 #include "qemu/error-report.h" 30 #include "qemu/log.h" 31 #include "qemu/module.h" 32 #include "hw/pci/msi.h" 33 #include "hw/pci/msix.h" 34 #include "hw/loader.h" 35 #include "sysemu/kvm.h" 36 #include "virtio-pci.h" 37 #include "qemu/range.h" 38 #include "hw/virtio/virtio-bus.h" 39 #include "qapi/visitor.h" 40 41 #define VIRTIO_PCI_REGION_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_present(dev)) 42 43 #undef VIRTIO_PCI_CONFIG 44 45 /* The remaining space is defined by each driver as the per-driver 46 * configuration space */ 47 #define VIRTIO_PCI_CONFIG_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_enabled(dev)) 48 49 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size, 50 VirtIOPCIProxy *dev); 51 static void virtio_pci_reset(DeviceState *qdev); 52 53 /* virtio device */ 54 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */ 55 static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d) 56 { 57 return container_of(d, VirtIOPCIProxy, pci_dev.qdev); 58 } 59 60 /* DeviceState to VirtIOPCIProxy. Note: used on datapath, 61 * be careful and test performance if you change this. 62 */ 63 static inline VirtIOPCIProxy *to_virtio_pci_proxy_fast(DeviceState *d) 64 { 65 return container_of(d, VirtIOPCIProxy, pci_dev.qdev); 66 } 67 68 static void virtio_pci_notify(DeviceState *d, uint16_t vector) 69 { 70 VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(d); 71 72 if (msix_enabled(&proxy->pci_dev)) 73 msix_notify(&proxy->pci_dev, vector); 74 else { 75 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 76 pci_set_irq(&proxy->pci_dev, qatomic_read(&vdev->isr) & 1); 77 } 78 } 79 80 static void virtio_pci_save_config(DeviceState *d, QEMUFile *f) 81 { 82 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 83 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 84 85 pci_device_save(&proxy->pci_dev, f); 86 msix_save(&proxy->pci_dev, f); 87 if (msix_present(&proxy->pci_dev)) 88 qemu_put_be16(f, vdev->config_vector); 89 } 90 91 static const VMStateDescription vmstate_virtio_pci_modern_queue_state = { 92 .name = "virtio_pci/modern_queue_state", 93 .version_id = 1, 94 .minimum_version_id = 1, 95 .fields = (VMStateField[]) { 96 VMSTATE_UINT16(num, VirtIOPCIQueue), 97 VMSTATE_UNUSED(1), /* enabled was stored as be16 */ 98 VMSTATE_BOOL(enabled, VirtIOPCIQueue), 99 VMSTATE_UINT32_ARRAY(desc, VirtIOPCIQueue, 2), 100 VMSTATE_UINT32_ARRAY(avail, VirtIOPCIQueue, 2), 101 VMSTATE_UINT32_ARRAY(used, VirtIOPCIQueue, 2), 102 VMSTATE_END_OF_LIST() 103 } 104 }; 105 106 static bool virtio_pci_modern_state_needed(void *opaque) 107 { 108 VirtIOPCIProxy *proxy = opaque; 109 110 return virtio_pci_modern(proxy); 111 } 112 113 static const VMStateDescription vmstate_virtio_pci_modern_state_sub = { 114 .name = "virtio_pci/modern_state", 115 .version_id = 1, 116 .minimum_version_id = 1, 117 .needed = &virtio_pci_modern_state_needed, 118 .fields = (VMStateField[]) { 119 VMSTATE_UINT32(dfselect, VirtIOPCIProxy), 120 VMSTATE_UINT32(gfselect, VirtIOPCIProxy), 121 VMSTATE_UINT32_ARRAY(guest_features, VirtIOPCIProxy, 2), 122 VMSTATE_STRUCT_ARRAY(vqs, VirtIOPCIProxy, VIRTIO_QUEUE_MAX, 0, 123 vmstate_virtio_pci_modern_queue_state, 124 VirtIOPCIQueue), 125 VMSTATE_END_OF_LIST() 126 } 127 }; 128 129 static const VMStateDescription vmstate_virtio_pci = { 130 .name = "virtio_pci", 131 .version_id = 1, 132 .minimum_version_id = 1, 133 .minimum_version_id_old = 1, 134 .fields = (VMStateField[]) { 135 VMSTATE_END_OF_LIST() 136 }, 137 .subsections = (const VMStateDescription*[]) { 138 &vmstate_virtio_pci_modern_state_sub, 139 NULL 140 } 141 }; 142 143 static bool virtio_pci_has_extra_state(DeviceState *d) 144 { 145 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 146 147 return proxy->flags & VIRTIO_PCI_FLAG_MIGRATE_EXTRA; 148 } 149 150 static void virtio_pci_save_extra_state(DeviceState *d, QEMUFile *f) 151 { 152 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 153 154 vmstate_save_state(f, &vmstate_virtio_pci, proxy, NULL); 155 } 156 157 static int virtio_pci_load_extra_state(DeviceState *d, QEMUFile *f) 158 { 159 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 160 161 return vmstate_load_state(f, &vmstate_virtio_pci, proxy, 1); 162 } 163 164 static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f) 165 { 166 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 167 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 168 169 if (msix_present(&proxy->pci_dev)) 170 qemu_put_be16(f, virtio_queue_vector(vdev, n)); 171 } 172 173 static int virtio_pci_load_config(DeviceState *d, QEMUFile *f) 174 { 175 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 176 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 177 178 int ret; 179 ret = pci_device_load(&proxy->pci_dev, f); 180 if (ret) { 181 return ret; 182 } 183 msix_unuse_all_vectors(&proxy->pci_dev); 184 msix_load(&proxy->pci_dev, f); 185 if (msix_present(&proxy->pci_dev)) { 186 qemu_get_be16s(f, &vdev->config_vector); 187 } else { 188 vdev->config_vector = VIRTIO_NO_VECTOR; 189 } 190 if (vdev->config_vector != VIRTIO_NO_VECTOR) { 191 return msix_vector_use(&proxy->pci_dev, vdev->config_vector); 192 } 193 return 0; 194 } 195 196 static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f) 197 { 198 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 199 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 200 201 uint16_t vector; 202 if (msix_present(&proxy->pci_dev)) { 203 qemu_get_be16s(f, &vector); 204 } else { 205 vector = VIRTIO_NO_VECTOR; 206 } 207 virtio_queue_set_vector(vdev, n, vector); 208 if (vector != VIRTIO_NO_VECTOR) { 209 return msix_vector_use(&proxy->pci_dev, vector); 210 } 211 212 return 0; 213 } 214 215 static bool virtio_pci_ioeventfd_enabled(DeviceState *d) 216 { 217 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 218 219 return (proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) != 0; 220 } 221 222 #define QEMU_VIRTIO_PCI_QUEUE_MEM_MULT 0x1000 223 224 static inline int virtio_pci_queue_mem_mult(struct VirtIOPCIProxy *proxy) 225 { 226 return (proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ) ? 227 QEMU_VIRTIO_PCI_QUEUE_MEM_MULT : 4; 228 } 229 230 static int virtio_pci_ioeventfd_assign(DeviceState *d, EventNotifier *notifier, 231 int n, bool assign) 232 { 233 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 234 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 235 VirtQueue *vq = virtio_get_queue(vdev, n); 236 bool legacy = virtio_pci_legacy(proxy); 237 bool modern = virtio_pci_modern(proxy); 238 bool fast_mmio = kvm_ioeventfd_any_length_enabled(); 239 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 240 MemoryRegion *modern_mr = &proxy->notify.mr; 241 MemoryRegion *modern_notify_mr = &proxy->notify_pio.mr; 242 MemoryRegion *legacy_mr = &proxy->bar; 243 hwaddr modern_addr = virtio_pci_queue_mem_mult(proxy) * 244 virtio_get_queue_index(vq); 245 hwaddr legacy_addr = VIRTIO_PCI_QUEUE_NOTIFY; 246 247 if (assign) { 248 if (modern) { 249 if (fast_mmio) { 250 memory_region_add_eventfd(modern_mr, modern_addr, 0, 251 false, n, notifier); 252 } else { 253 memory_region_add_eventfd(modern_mr, modern_addr, 2, 254 false, n, notifier); 255 } 256 if (modern_pio) { 257 memory_region_add_eventfd(modern_notify_mr, 0, 2, 258 true, n, notifier); 259 } 260 } 261 if (legacy) { 262 memory_region_add_eventfd(legacy_mr, legacy_addr, 2, 263 true, n, notifier); 264 } 265 } else { 266 if (modern) { 267 if (fast_mmio) { 268 memory_region_del_eventfd(modern_mr, modern_addr, 0, 269 false, n, notifier); 270 } else { 271 memory_region_del_eventfd(modern_mr, modern_addr, 2, 272 false, n, notifier); 273 } 274 if (modern_pio) { 275 memory_region_del_eventfd(modern_notify_mr, 0, 2, 276 true, n, notifier); 277 } 278 } 279 if (legacy) { 280 memory_region_del_eventfd(legacy_mr, legacy_addr, 2, 281 true, n, notifier); 282 } 283 } 284 return 0; 285 } 286 287 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy) 288 { 289 virtio_bus_start_ioeventfd(&proxy->bus); 290 } 291 292 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy) 293 { 294 virtio_bus_stop_ioeventfd(&proxy->bus); 295 } 296 297 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) 298 { 299 VirtIOPCIProxy *proxy = opaque; 300 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 301 hwaddr pa; 302 303 switch (addr) { 304 case VIRTIO_PCI_GUEST_FEATURES: 305 /* Guest does not negotiate properly? We have to assume nothing. */ 306 if (val & (1 << VIRTIO_F_BAD_FEATURE)) { 307 val = virtio_bus_get_vdev_bad_features(&proxy->bus); 308 } 309 virtio_set_features(vdev, val); 310 break; 311 case VIRTIO_PCI_QUEUE_PFN: 312 pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT; 313 if (pa == 0) { 314 virtio_pci_reset(DEVICE(proxy)); 315 } 316 else 317 virtio_queue_set_addr(vdev, vdev->queue_sel, pa); 318 break; 319 case VIRTIO_PCI_QUEUE_SEL: 320 if (val < VIRTIO_QUEUE_MAX) 321 vdev->queue_sel = val; 322 break; 323 case VIRTIO_PCI_QUEUE_NOTIFY: 324 if (val < VIRTIO_QUEUE_MAX) { 325 virtio_queue_notify(vdev, val); 326 } 327 break; 328 case VIRTIO_PCI_STATUS: 329 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) { 330 virtio_pci_stop_ioeventfd(proxy); 331 } 332 333 virtio_set_status(vdev, val & 0xFF); 334 335 if (val & VIRTIO_CONFIG_S_DRIVER_OK) { 336 virtio_pci_start_ioeventfd(proxy); 337 } 338 339 if (vdev->status == 0) { 340 virtio_pci_reset(DEVICE(proxy)); 341 } 342 343 /* Linux before 2.6.34 drives the device without enabling 344 the PCI device bus master bit. Enable it automatically 345 for the guest. This is a PCI spec violation but so is 346 initiating DMA with bus master bit clear. */ 347 if (val == (VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER)) { 348 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND, 349 proxy->pci_dev.config[PCI_COMMAND] | 350 PCI_COMMAND_MASTER, 1); 351 } 352 break; 353 case VIRTIO_MSI_CONFIG_VECTOR: 354 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector); 355 /* Make it possible for guest to discover an error took place. */ 356 if (msix_vector_use(&proxy->pci_dev, val) < 0) 357 val = VIRTIO_NO_VECTOR; 358 vdev->config_vector = val; 359 break; 360 case VIRTIO_MSI_QUEUE_VECTOR: 361 msix_vector_unuse(&proxy->pci_dev, 362 virtio_queue_vector(vdev, vdev->queue_sel)); 363 /* Make it possible for guest to discover an error took place. */ 364 if (msix_vector_use(&proxy->pci_dev, val) < 0) 365 val = VIRTIO_NO_VECTOR; 366 virtio_queue_set_vector(vdev, vdev->queue_sel, val); 367 break; 368 default: 369 qemu_log_mask(LOG_GUEST_ERROR, 370 "%s: unexpected address 0x%x value 0x%x\n", 371 __func__, addr, val); 372 break; 373 } 374 } 375 376 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr) 377 { 378 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 379 uint32_t ret = 0xFFFFFFFF; 380 381 switch (addr) { 382 case VIRTIO_PCI_HOST_FEATURES: 383 ret = vdev->host_features; 384 break; 385 case VIRTIO_PCI_GUEST_FEATURES: 386 ret = vdev->guest_features; 387 break; 388 case VIRTIO_PCI_QUEUE_PFN: 389 ret = virtio_queue_get_addr(vdev, vdev->queue_sel) 390 >> VIRTIO_PCI_QUEUE_ADDR_SHIFT; 391 break; 392 case VIRTIO_PCI_QUEUE_NUM: 393 ret = virtio_queue_get_num(vdev, vdev->queue_sel); 394 break; 395 case VIRTIO_PCI_QUEUE_SEL: 396 ret = vdev->queue_sel; 397 break; 398 case VIRTIO_PCI_STATUS: 399 ret = vdev->status; 400 break; 401 case VIRTIO_PCI_ISR: 402 /* reading from the ISR also clears it. */ 403 ret = qatomic_xchg(&vdev->isr, 0); 404 pci_irq_deassert(&proxy->pci_dev); 405 break; 406 case VIRTIO_MSI_CONFIG_VECTOR: 407 ret = vdev->config_vector; 408 break; 409 case VIRTIO_MSI_QUEUE_VECTOR: 410 ret = virtio_queue_vector(vdev, vdev->queue_sel); 411 break; 412 default: 413 break; 414 } 415 416 return ret; 417 } 418 419 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr, 420 unsigned size) 421 { 422 VirtIOPCIProxy *proxy = opaque; 423 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 424 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev); 425 uint64_t val = 0; 426 if (addr < config) { 427 return virtio_ioport_read(proxy, addr); 428 } 429 addr -= config; 430 431 switch (size) { 432 case 1: 433 val = virtio_config_readb(vdev, addr); 434 break; 435 case 2: 436 val = virtio_config_readw(vdev, addr); 437 if (virtio_is_big_endian(vdev)) { 438 val = bswap16(val); 439 } 440 break; 441 case 4: 442 val = virtio_config_readl(vdev, addr); 443 if (virtio_is_big_endian(vdev)) { 444 val = bswap32(val); 445 } 446 break; 447 } 448 return val; 449 } 450 451 static void virtio_pci_config_write(void *opaque, hwaddr addr, 452 uint64_t val, unsigned size) 453 { 454 VirtIOPCIProxy *proxy = opaque; 455 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev); 456 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 457 if (addr < config) { 458 virtio_ioport_write(proxy, addr, val); 459 return; 460 } 461 addr -= config; 462 /* 463 * Virtio-PCI is odd. Ioports are LE but config space is target native 464 * endian. 465 */ 466 switch (size) { 467 case 1: 468 virtio_config_writeb(vdev, addr, val); 469 break; 470 case 2: 471 if (virtio_is_big_endian(vdev)) { 472 val = bswap16(val); 473 } 474 virtio_config_writew(vdev, addr, val); 475 break; 476 case 4: 477 if (virtio_is_big_endian(vdev)) { 478 val = bswap32(val); 479 } 480 virtio_config_writel(vdev, addr, val); 481 break; 482 } 483 } 484 485 static const MemoryRegionOps virtio_pci_config_ops = { 486 .read = virtio_pci_config_read, 487 .write = virtio_pci_config_write, 488 .impl = { 489 .min_access_size = 1, 490 .max_access_size = 4, 491 }, 492 .endianness = DEVICE_LITTLE_ENDIAN, 493 }; 494 495 static MemoryRegion *virtio_address_space_lookup(VirtIOPCIProxy *proxy, 496 hwaddr *off, int len) 497 { 498 int i; 499 VirtIOPCIRegion *reg; 500 501 for (i = 0; i < ARRAY_SIZE(proxy->regs); ++i) { 502 reg = &proxy->regs[i]; 503 if (*off >= reg->offset && 504 *off + len <= reg->offset + reg->size) { 505 *off -= reg->offset; 506 return ®->mr; 507 } 508 } 509 510 return NULL; 511 } 512 513 /* Below are generic functions to do memcpy from/to an address space, 514 * without byteswaps, with input validation. 515 * 516 * As regular address_space_* APIs all do some kind of byteswap at least for 517 * some host/target combinations, we are forced to explicitly convert to a 518 * known-endianness integer value. 519 * It doesn't really matter which endian format to go through, so the code 520 * below selects the endian that causes the least amount of work on the given 521 * host. 522 * 523 * Note: host pointer must be aligned. 524 */ 525 static 526 void virtio_address_space_write(VirtIOPCIProxy *proxy, hwaddr addr, 527 const uint8_t *buf, int len) 528 { 529 uint64_t val; 530 MemoryRegion *mr; 531 532 /* address_space_* APIs assume an aligned address. 533 * As address is under guest control, handle illegal values. 534 */ 535 addr &= ~(len - 1); 536 537 mr = virtio_address_space_lookup(proxy, &addr, len); 538 if (!mr) { 539 return; 540 } 541 542 /* Make sure caller aligned buf properly */ 543 assert(!(((uintptr_t)buf) & (len - 1))); 544 545 switch (len) { 546 case 1: 547 val = pci_get_byte(buf); 548 break; 549 case 2: 550 val = pci_get_word(buf); 551 break; 552 case 4: 553 val = pci_get_long(buf); 554 break; 555 default: 556 /* As length is under guest control, handle illegal values. */ 557 return; 558 } 559 memory_region_dispatch_write(mr, addr, val, size_memop(len) | MO_LE, 560 MEMTXATTRS_UNSPECIFIED); 561 } 562 563 static void 564 virtio_address_space_read(VirtIOPCIProxy *proxy, hwaddr addr, 565 uint8_t *buf, int len) 566 { 567 uint64_t val; 568 MemoryRegion *mr; 569 570 /* address_space_* APIs assume an aligned address. 571 * As address is under guest control, handle illegal values. 572 */ 573 addr &= ~(len - 1); 574 575 mr = virtio_address_space_lookup(proxy, &addr, len); 576 if (!mr) { 577 return; 578 } 579 580 /* Make sure caller aligned buf properly */ 581 assert(!(((uintptr_t)buf) & (len - 1))); 582 583 memory_region_dispatch_read(mr, addr, &val, size_memop(len) | MO_LE, 584 MEMTXATTRS_UNSPECIFIED); 585 switch (len) { 586 case 1: 587 pci_set_byte(buf, val); 588 break; 589 case 2: 590 pci_set_word(buf, val); 591 break; 592 case 4: 593 pci_set_long(buf, val); 594 break; 595 default: 596 /* As length is under guest control, handle illegal values. */ 597 break; 598 } 599 } 600 601 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address, 602 uint32_t val, int len) 603 { 604 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 605 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 606 struct virtio_pci_cfg_cap *cfg; 607 608 pci_default_write_config(pci_dev, address, val, len); 609 610 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) { 611 pcie_cap_flr_write_config(pci_dev, address, val, len); 612 } 613 614 if (range_covers_byte(address, len, PCI_COMMAND)) { 615 if (!(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) { 616 virtio_set_disabled(vdev, true); 617 virtio_pci_stop_ioeventfd(proxy); 618 virtio_set_status(vdev, vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK); 619 } else { 620 virtio_set_disabled(vdev, false); 621 } 622 } 623 624 if (proxy->config_cap && 625 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap, 626 pci_cfg_data), 627 sizeof cfg->pci_cfg_data)) { 628 uint32_t off; 629 uint32_t len; 630 631 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap); 632 off = le32_to_cpu(cfg->cap.offset); 633 len = le32_to_cpu(cfg->cap.length); 634 635 if (len == 1 || len == 2 || len == 4) { 636 assert(len <= sizeof cfg->pci_cfg_data); 637 virtio_address_space_write(proxy, off, cfg->pci_cfg_data, len); 638 } 639 } 640 } 641 642 static uint32_t virtio_read_config(PCIDevice *pci_dev, 643 uint32_t address, int len) 644 { 645 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 646 struct virtio_pci_cfg_cap *cfg; 647 648 if (proxy->config_cap && 649 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap, 650 pci_cfg_data), 651 sizeof cfg->pci_cfg_data)) { 652 uint32_t off; 653 uint32_t len; 654 655 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap); 656 off = le32_to_cpu(cfg->cap.offset); 657 len = le32_to_cpu(cfg->cap.length); 658 659 if (len == 1 || len == 2 || len == 4) { 660 assert(len <= sizeof cfg->pci_cfg_data); 661 virtio_address_space_read(proxy, off, cfg->pci_cfg_data, len); 662 } 663 } 664 665 return pci_default_read_config(pci_dev, address, len); 666 } 667 668 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy, 669 unsigned int queue_no, 670 unsigned int vector) 671 { 672 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 673 int ret; 674 675 if (irqfd->users == 0) { 676 ret = kvm_irqchip_add_msi_route(kvm_state, vector, &proxy->pci_dev); 677 if (ret < 0) { 678 return ret; 679 } 680 irqfd->virq = ret; 681 } 682 irqfd->users++; 683 return 0; 684 } 685 686 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy, 687 unsigned int vector) 688 { 689 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 690 if (--irqfd->users == 0) { 691 kvm_irqchip_release_virq(kvm_state, irqfd->virq); 692 } 693 } 694 695 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy, 696 unsigned int queue_no, 697 unsigned int vector) 698 { 699 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 700 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 701 VirtQueue *vq = virtio_get_queue(vdev, queue_no); 702 EventNotifier *n = virtio_queue_get_guest_notifier(vq); 703 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq); 704 } 705 706 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy, 707 unsigned int queue_no, 708 unsigned int vector) 709 { 710 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 711 VirtQueue *vq = virtio_get_queue(vdev, queue_no); 712 EventNotifier *n = virtio_queue_get_guest_notifier(vq); 713 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 714 int ret; 715 716 ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, irqfd->virq); 717 assert(ret == 0); 718 } 719 720 static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs) 721 { 722 PCIDevice *dev = &proxy->pci_dev; 723 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 724 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 725 unsigned int vector; 726 int ret, queue_no; 727 728 for (queue_no = 0; queue_no < nvqs; queue_no++) { 729 if (!virtio_queue_get_num(vdev, queue_no)) { 730 break; 731 } 732 vector = virtio_queue_vector(vdev, queue_no); 733 if (vector >= msix_nr_vectors_allocated(dev)) { 734 continue; 735 } 736 ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector); 737 if (ret < 0) { 738 goto undo; 739 } 740 /* If guest supports masking, set up irqfd now. 741 * Otherwise, delay until unmasked in the frontend. 742 */ 743 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 744 ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector); 745 if (ret < 0) { 746 kvm_virtio_pci_vq_vector_release(proxy, vector); 747 goto undo; 748 } 749 } 750 } 751 return 0; 752 753 undo: 754 while (--queue_no >= 0) { 755 vector = virtio_queue_vector(vdev, queue_no); 756 if (vector >= msix_nr_vectors_allocated(dev)) { 757 continue; 758 } 759 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 760 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector); 761 } 762 kvm_virtio_pci_vq_vector_release(proxy, vector); 763 } 764 return ret; 765 } 766 767 static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs) 768 { 769 PCIDevice *dev = &proxy->pci_dev; 770 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 771 unsigned int vector; 772 int queue_no; 773 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 774 775 for (queue_no = 0; queue_no < nvqs; queue_no++) { 776 if (!virtio_queue_get_num(vdev, queue_no)) { 777 break; 778 } 779 vector = virtio_queue_vector(vdev, queue_no); 780 if (vector >= msix_nr_vectors_allocated(dev)) { 781 continue; 782 } 783 /* If guest supports masking, clean up irqfd now. 784 * Otherwise, it was cleaned when masked in the frontend. 785 */ 786 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 787 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector); 788 } 789 kvm_virtio_pci_vq_vector_release(proxy, vector); 790 } 791 } 792 793 static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy, 794 unsigned int queue_no, 795 unsigned int vector, 796 MSIMessage msg) 797 { 798 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 799 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 800 VirtQueue *vq = virtio_get_queue(vdev, queue_no); 801 EventNotifier *n = virtio_queue_get_guest_notifier(vq); 802 VirtIOIRQFD *irqfd; 803 int ret = 0; 804 805 if (proxy->vector_irqfd) { 806 irqfd = &proxy->vector_irqfd[vector]; 807 if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) { 808 ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg, 809 &proxy->pci_dev); 810 if (ret < 0) { 811 return ret; 812 } 813 kvm_irqchip_commit_routes(kvm_state); 814 } 815 } 816 817 /* If guest supports masking, irqfd is already setup, unmask it. 818 * Otherwise, set it up now. 819 */ 820 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 821 k->guest_notifier_mask(vdev, queue_no, false); 822 /* Test after unmasking to avoid losing events. */ 823 if (k->guest_notifier_pending && 824 k->guest_notifier_pending(vdev, queue_no)) { 825 event_notifier_set(n); 826 } 827 } else { 828 ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector); 829 } 830 return ret; 831 } 832 833 static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy, 834 unsigned int queue_no, 835 unsigned int vector) 836 { 837 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 838 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 839 840 /* If guest supports masking, keep irqfd but mask it. 841 * Otherwise, clean it up now. 842 */ 843 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 844 k->guest_notifier_mask(vdev, queue_no, true); 845 } else { 846 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector); 847 } 848 } 849 850 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector, 851 MSIMessage msg) 852 { 853 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 854 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 855 VirtQueue *vq = virtio_vector_first_queue(vdev, vector); 856 int ret, index, unmasked = 0; 857 858 while (vq) { 859 index = virtio_get_queue_index(vq); 860 if (!virtio_queue_get_num(vdev, index)) { 861 break; 862 } 863 if (index < proxy->nvqs_with_notifiers) { 864 ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg); 865 if (ret < 0) { 866 goto undo; 867 } 868 ++unmasked; 869 } 870 vq = virtio_vector_next_queue(vq); 871 } 872 873 return 0; 874 875 undo: 876 vq = virtio_vector_first_queue(vdev, vector); 877 while (vq && unmasked >= 0) { 878 index = virtio_get_queue_index(vq); 879 if (index < proxy->nvqs_with_notifiers) { 880 virtio_pci_vq_vector_mask(proxy, index, vector); 881 --unmasked; 882 } 883 vq = virtio_vector_next_queue(vq); 884 } 885 return ret; 886 } 887 888 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector) 889 { 890 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 891 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 892 VirtQueue *vq = virtio_vector_first_queue(vdev, vector); 893 int index; 894 895 while (vq) { 896 index = virtio_get_queue_index(vq); 897 if (!virtio_queue_get_num(vdev, index)) { 898 break; 899 } 900 if (index < proxy->nvqs_with_notifiers) { 901 virtio_pci_vq_vector_mask(proxy, index, vector); 902 } 903 vq = virtio_vector_next_queue(vq); 904 } 905 } 906 907 static void virtio_pci_vector_poll(PCIDevice *dev, 908 unsigned int vector_start, 909 unsigned int vector_end) 910 { 911 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 912 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 913 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 914 int queue_no; 915 unsigned int vector; 916 EventNotifier *notifier; 917 VirtQueue *vq; 918 919 for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) { 920 if (!virtio_queue_get_num(vdev, queue_no)) { 921 break; 922 } 923 vector = virtio_queue_vector(vdev, queue_no); 924 if (vector < vector_start || vector >= vector_end || 925 !msix_is_masked(dev, vector)) { 926 continue; 927 } 928 vq = virtio_get_queue(vdev, queue_no); 929 notifier = virtio_queue_get_guest_notifier(vq); 930 if (k->guest_notifier_pending) { 931 if (k->guest_notifier_pending(vdev, queue_no)) { 932 msix_set_pending(dev, vector); 933 } 934 } else if (event_notifier_test_and_clear(notifier)) { 935 msix_set_pending(dev, vector); 936 } 937 } 938 } 939 940 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign, 941 bool with_irqfd) 942 { 943 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 944 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 945 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 946 VirtQueue *vq = virtio_get_queue(vdev, n); 947 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 948 949 if (assign) { 950 int r = event_notifier_init(notifier, 0); 951 if (r < 0) { 952 return r; 953 } 954 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); 955 } else { 956 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); 957 event_notifier_cleanup(notifier); 958 } 959 960 if (!msix_enabled(&proxy->pci_dev) && 961 vdev->use_guest_notifier_mask && 962 vdc->guest_notifier_mask) { 963 vdc->guest_notifier_mask(vdev, n, !assign); 964 } 965 966 return 0; 967 } 968 969 static bool virtio_pci_query_guest_notifiers(DeviceState *d) 970 { 971 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 972 return msix_enabled(&proxy->pci_dev); 973 } 974 975 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign) 976 { 977 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 978 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 979 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 980 int r, n; 981 bool with_irqfd = msix_enabled(&proxy->pci_dev) && 982 kvm_msi_via_irqfd_enabled(); 983 984 nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX); 985 986 /* When deassigning, pass a consistent nvqs value 987 * to avoid leaking notifiers. 988 */ 989 assert(assign || nvqs == proxy->nvqs_with_notifiers); 990 991 proxy->nvqs_with_notifiers = nvqs; 992 993 /* Must unset vector notifier while guest notifier is still assigned */ 994 if ((proxy->vector_irqfd || k->guest_notifier_mask) && !assign) { 995 msix_unset_vector_notifiers(&proxy->pci_dev); 996 if (proxy->vector_irqfd) { 997 kvm_virtio_pci_vector_release(proxy, nvqs); 998 g_free(proxy->vector_irqfd); 999 proxy->vector_irqfd = NULL; 1000 } 1001 } 1002 1003 for (n = 0; n < nvqs; n++) { 1004 if (!virtio_queue_get_num(vdev, n)) { 1005 break; 1006 } 1007 1008 r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd); 1009 if (r < 0) { 1010 goto assign_error; 1011 } 1012 } 1013 1014 /* Must set vector notifier after guest notifier has been assigned */ 1015 if ((with_irqfd || k->guest_notifier_mask) && assign) { 1016 if (with_irqfd) { 1017 proxy->vector_irqfd = 1018 g_malloc0(sizeof(*proxy->vector_irqfd) * 1019 msix_nr_vectors_allocated(&proxy->pci_dev)); 1020 r = kvm_virtio_pci_vector_use(proxy, nvqs); 1021 if (r < 0) { 1022 goto assign_error; 1023 } 1024 } 1025 r = msix_set_vector_notifiers(&proxy->pci_dev, 1026 virtio_pci_vector_unmask, 1027 virtio_pci_vector_mask, 1028 virtio_pci_vector_poll); 1029 if (r < 0) { 1030 goto notifiers_error; 1031 } 1032 } 1033 1034 return 0; 1035 1036 notifiers_error: 1037 if (with_irqfd) { 1038 assert(assign); 1039 kvm_virtio_pci_vector_release(proxy, nvqs); 1040 } 1041 1042 assign_error: 1043 /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */ 1044 assert(assign); 1045 while (--n >= 0) { 1046 virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd); 1047 } 1048 return r; 1049 } 1050 1051 static int virtio_pci_set_host_notifier_mr(DeviceState *d, int n, 1052 MemoryRegion *mr, bool assign) 1053 { 1054 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1055 int offset; 1056 1057 if (n >= VIRTIO_QUEUE_MAX || !virtio_pci_modern(proxy) || 1058 virtio_pci_queue_mem_mult(proxy) != memory_region_size(mr)) { 1059 return -1; 1060 } 1061 1062 if (assign) { 1063 offset = virtio_pci_queue_mem_mult(proxy) * n; 1064 memory_region_add_subregion_overlap(&proxy->notify.mr, offset, mr, 1); 1065 } else { 1066 memory_region_del_subregion(&proxy->notify.mr, mr); 1067 } 1068 1069 return 0; 1070 } 1071 1072 static void virtio_pci_vmstate_change(DeviceState *d, bool running) 1073 { 1074 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1075 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1076 1077 if (running) { 1078 /* Old QEMU versions did not set bus master enable on status write. 1079 * Detect DRIVER set and enable it. 1080 */ 1081 if ((proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION) && 1082 (vdev->status & VIRTIO_CONFIG_S_DRIVER) && 1083 !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) { 1084 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND, 1085 proxy->pci_dev.config[PCI_COMMAND] | 1086 PCI_COMMAND_MASTER, 1); 1087 } 1088 virtio_pci_start_ioeventfd(proxy); 1089 } else { 1090 virtio_pci_stop_ioeventfd(proxy); 1091 } 1092 } 1093 1094 /* 1095 * virtio-pci: This is the PCIDevice which has a virtio-pci-bus. 1096 */ 1097 1098 static int virtio_pci_query_nvectors(DeviceState *d) 1099 { 1100 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1101 1102 return proxy->nvectors; 1103 } 1104 1105 static AddressSpace *virtio_pci_get_dma_as(DeviceState *d) 1106 { 1107 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1108 PCIDevice *dev = &proxy->pci_dev; 1109 1110 return pci_get_address_space(dev); 1111 } 1112 1113 static bool virtio_pci_queue_enabled(DeviceState *d, int n) 1114 { 1115 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1116 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1117 1118 if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { 1119 return proxy->vqs[n].enabled; 1120 } 1121 1122 return virtio_queue_enabled_legacy(vdev, n); 1123 } 1124 1125 static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy, 1126 struct virtio_pci_cap *cap) 1127 { 1128 PCIDevice *dev = &proxy->pci_dev; 1129 int offset; 1130 1131 offset = pci_add_capability(dev, PCI_CAP_ID_VNDR, 0, 1132 cap->cap_len, &error_abort); 1133 1134 assert(cap->cap_len >= sizeof *cap); 1135 memcpy(dev->config + offset + PCI_CAP_FLAGS, &cap->cap_len, 1136 cap->cap_len - PCI_CAP_FLAGS); 1137 1138 return offset; 1139 } 1140 1141 static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr, 1142 unsigned size) 1143 { 1144 VirtIOPCIProxy *proxy = opaque; 1145 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1146 uint32_t val = 0; 1147 int i; 1148 1149 switch (addr) { 1150 case VIRTIO_PCI_COMMON_DFSELECT: 1151 val = proxy->dfselect; 1152 break; 1153 case VIRTIO_PCI_COMMON_DF: 1154 if (proxy->dfselect <= 1) { 1155 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 1156 1157 val = (vdev->host_features & ~vdc->legacy_features) >> 1158 (32 * proxy->dfselect); 1159 } 1160 break; 1161 case VIRTIO_PCI_COMMON_GFSELECT: 1162 val = proxy->gfselect; 1163 break; 1164 case VIRTIO_PCI_COMMON_GF: 1165 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) { 1166 val = proxy->guest_features[proxy->gfselect]; 1167 } 1168 break; 1169 case VIRTIO_PCI_COMMON_MSIX: 1170 val = vdev->config_vector; 1171 break; 1172 case VIRTIO_PCI_COMMON_NUMQ: 1173 for (i = 0; i < VIRTIO_QUEUE_MAX; ++i) { 1174 if (virtio_queue_get_num(vdev, i)) { 1175 val = i + 1; 1176 } 1177 } 1178 break; 1179 case VIRTIO_PCI_COMMON_STATUS: 1180 val = vdev->status; 1181 break; 1182 case VIRTIO_PCI_COMMON_CFGGENERATION: 1183 val = vdev->generation; 1184 break; 1185 case VIRTIO_PCI_COMMON_Q_SELECT: 1186 val = vdev->queue_sel; 1187 break; 1188 case VIRTIO_PCI_COMMON_Q_SIZE: 1189 val = virtio_queue_get_num(vdev, vdev->queue_sel); 1190 break; 1191 case VIRTIO_PCI_COMMON_Q_MSIX: 1192 val = virtio_queue_vector(vdev, vdev->queue_sel); 1193 break; 1194 case VIRTIO_PCI_COMMON_Q_ENABLE: 1195 val = proxy->vqs[vdev->queue_sel].enabled; 1196 break; 1197 case VIRTIO_PCI_COMMON_Q_NOFF: 1198 /* Simply map queues in order */ 1199 val = vdev->queue_sel; 1200 break; 1201 case VIRTIO_PCI_COMMON_Q_DESCLO: 1202 val = proxy->vqs[vdev->queue_sel].desc[0]; 1203 break; 1204 case VIRTIO_PCI_COMMON_Q_DESCHI: 1205 val = proxy->vqs[vdev->queue_sel].desc[1]; 1206 break; 1207 case VIRTIO_PCI_COMMON_Q_AVAILLO: 1208 val = proxy->vqs[vdev->queue_sel].avail[0]; 1209 break; 1210 case VIRTIO_PCI_COMMON_Q_AVAILHI: 1211 val = proxy->vqs[vdev->queue_sel].avail[1]; 1212 break; 1213 case VIRTIO_PCI_COMMON_Q_USEDLO: 1214 val = proxy->vqs[vdev->queue_sel].used[0]; 1215 break; 1216 case VIRTIO_PCI_COMMON_Q_USEDHI: 1217 val = proxy->vqs[vdev->queue_sel].used[1]; 1218 break; 1219 default: 1220 val = 0; 1221 } 1222 1223 return val; 1224 } 1225 1226 static void virtio_pci_common_write(void *opaque, hwaddr addr, 1227 uint64_t val, unsigned size) 1228 { 1229 VirtIOPCIProxy *proxy = opaque; 1230 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1231 1232 switch (addr) { 1233 case VIRTIO_PCI_COMMON_DFSELECT: 1234 proxy->dfselect = val; 1235 break; 1236 case VIRTIO_PCI_COMMON_GFSELECT: 1237 proxy->gfselect = val; 1238 break; 1239 case VIRTIO_PCI_COMMON_GF: 1240 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) { 1241 proxy->guest_features[proxy->gfselect] = val; 1242 virtio_set_features(vdev, 1243 (((uint64_t)proxy->guest_features[1]) << 32) | 1244 proxy->guest_features[0]); 1245 } 1246 break; 1247 case VIRTIO_PCI_COMMON_MSIX: 1248 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector); 1249 /* Make it possible for guest to discover an error took place. */ 1250 if (msix_vector_use(&proxy->pci_dev, val) < 0) { 1251 val = VIRTIO_NO_VECTOR; 1252 } 1253 vdev->config_vector = val; 1254 break; 1255 case VIRTIO_PCI_COMMON_STATUS: 1256 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) { 1257 virtio_pci_stop_ioeventfd(proxy); 1258 } 1259 1260 virtio_set_status(vdev, val & 0xFF); 1261 1262 if (val & VIRTIO_CONFIG_S_DRIVER_OK) { 1263 virtio_pci_start_ioeventfd(proxy); 1264 } 1265 1266 if (vdev->status == 0) { 1267 virtio_pci_reset(DEVICE(proxy)); 1268 } 1269 1270 break; 1271 case VIRTIO_PCI_COMMON_Q_SELECT: 1272 if (val < VIRTIO_QUEUE_MAX) { 1273 vdev->queue_sel = val; 1274 } 1275 break; 1276 case VIRTIO_PCI_COMMON_Q_SIZE: 1277 proxy->vqs[vdev->queue_sel].num = val; 1278 virtio_queue_set_num(vdev, vdev->queue_sel, 1279 proxy->vqs[vdev->queue_sel].num); 1280 break; 1281 case VIRTIO_PCI_COMMON_Q_MSIX: 1282 msix_vector_unuse(&proxy->pci_dev, 1283 virtio_queue_vector(vdev, vdev->queue_sel)); 1284 /* Make it possible for guest to discover an error took place. */ 1285 if (msix_vector_use(&proxy->pci_dev, val) < 0) { 1286 val = VIRTIO_NO_VECTOR; 1287 } 1288 virtio_queue_set_vector(vdev, vdev->queue_sel, val); 1289 break; 1290 case VIRTIO_PCI_COMMON_Q_ENABLE: 1291 if (val == 1) { 1292 virtio_queue_set_num(vdev, vdev->queue_sel, 1293 proxy->vqs[vdev->queue_sel].num); 1294 virtio_queue_set_rings(vdev, vdev->queue_sel, 1295 ((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 | 1296 proxy->vqs[vdev->queue_sel].desc[0], 1297 ((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 | 1298 proxy->vqs[vdev->queue_sel].avail[0], 1299 ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 | 1300 proxy->vqs[vdev->queue_sel].used[0]); 1301 proxy->vqs[vdev->queue_sel].enabled = 1; 1302 } else { 1303 virtio_error(vdev, "wrong value for queue_enable %"PRIx64, val); 1304 } 1305 break; 1306 case VIRTIO_PCI_COMMON_Q_DESCLO: 1307 proxy->vqs[vdev->queue_sel].desc[0] = val; 1308 break; 1309 case VIRTIO_PCI_COMMON_Q_DESCHI: 1310 proxy->vqs[vdev->queue_sel].desc[1] = val; 1311 break; 1312 case VIRTIO_PCI_COMMON_Q_AVAILLO: 1313 proxy->vqs[vdev->queue_sel].avail[0] = val; 1314 break; 1315 case VIRTIO_PCI_COMMON_Q_AVAILHI: 1316 proxy->vqs[vdev->queue_sel].avail[1] = val; 1317 break; 1318 case VIRTIO_PCI_COMMON_Q_USEDLO: 1319 proxy->vqs[vdev->queue_sel].used[0] = val; 1320 break; 1321 case VIRTIO_PCI_COMMON_Q_USEDHI: 1322 proxy->vqs[vdev->queue_sel].used[1] = val; 1323 break; 1324 default: 1325 break; 1326 } 1327 } 1328 1329 1330 static uint64_t virtio_pci_notify_read(void *opaque, hwaddr addr, 1331 unsigned size) 1332 { 1333 return 0; 1334 } 1335 1336 static void virtio_pci_notify_write(void *opaque, hwaddr addr, 1337 uint64_t val, unsigned size) 1338 { 1339 VirtIOPCIProxy *proxy = opaque; 1340 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1341 1342 unsigned queue = addr / virtio_pci_queue_mem_mult(proxy); 1343 1344 if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) { 1345 virtio_queue_notify(vdev, queue); 1346 } 1347 } 1348 1349 static void virtio_pci_notify_write_pio(void *opaque, hwaddr addr, 1350 uint64_t val, unsigned size) 1351 { 1352 VirtIOPCIProxy *proxy = opaque; 1353 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1354 1355 unsigned queue = val; 1356 1357 if (vdev != NULL && queue < VIRTIO_QUEUE_MAX) { 1358 virtio_queue_notify(vdev, queue); 1359 } 1360 } 1361 1362 static uint64_t virtio_pci_isr_read(void *opaque, hwaddr addr, 1363 unsigned size) 1364 { 1365 VirtIOPCIProxy *proxy = opaque; 1366 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1367 uint64_t val = qatomic_xchg(&vdev->isr, 0); 1368 pci_irq_deassert(&proxy->pci_dev); 1369 1370 return val; 1371 } 1372 1373 static void virtio_pci_isr_write(void *opaque, hwaddr addr, 1374 uint64_t val, unsigned size) 1375 { 1376 } 1377 1378 static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr, 1379 unsigned size) 1380 { 1381 VirtIOPCIProxy *proxy = opaque; 1382 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1383 uint64_t val = 0; 1384 1385 if (vdev == NULL) { 1386 return val; 1387 } 1388 1389 switch (size) { 1390 case 1: 1391 val = virtio_config_modern_readb(vdev, addr); 1392 break; 1393 case 2: 1394 val = virtio_config_modern_readw(vdev, addr); 1395 break; 1396 case 4: 1397 val = virtio_config_modern_readl(vdev, addr); 1398 break; 1399 } 1400 return val; 1401 } 1402 1403 static void virtio_pci_device_write(void *opaque, hwaddr addr, 1404 uint64_t val, unsigned size) 1405 { 1406 VirtIOPCIProxy *proxy = opaque; 1407 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1408 1409 if (vdev == NULL) { 1410 return; 1411 } 1412 1413 switch (size) { 1414 case 1: 1415 virtio_config_modern_writeb(vdev, addr, val); 1416 break; 1417 case 2: 1418 virtio_config_modern_writew(vdev, addr, val); 1419 break; 1420 case 4: 1421 virtio_config_modern_writel(vdev, addr, val); 1422 break; 1423 } 1424 } 1425 1426 static void virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy, 1427 const char *vdev_name) 1428 { 1429 static const MemoryRegionOps common_ops = { 1430 .read = virtio_pci_common_read, 1431 .write = virtio_pci_common_write, 1432 .impl = { 1433 .min_access_size = 1, 1434 .max_access_size = 4, 1435 }, 1436 .endianness = DEVICE_LITTLE_ENDIAN, 1437 }; 1438 static const MemoryRegionOps isr_ops = { 1439 .read = virtio_pci_isr_read, 1440 .write = virtio_pci_isr_write, 1441 .impl = { 1442 .min_access_size = 1, 1443 .max_access_size = 4, 1444 }, 1445 .endianness = DEVICE_LITTLE_ENDIAN, 1446 }; 1447 static const MemoryRegionOps device_ops = { 1448 .read = virtio_pci_device_read, 1449 .write = virtio_pci_device_write, 1450 .impl = { 1451 .min_access_size = 1, 1452 .max_access_size = 4, 1453 }, 1454 .endianness = DEVICE_LITTLE_ENDIAN, 1455 }; 1456 static const MemoryRegionOps notify_ops = { 1457 .read = virtio_pci_notify_read, 1458 .write = virtio_pci_notify_write, 1459 .impl = { 1460 .min_access_size = 1, 1461 .max_access_size = 4, 1462 }, 1463 .endianness = DEVICE_LITTLE_ENDIAN, 1464 }; 1465 static const MemoryRegionOps notify_pio_ops = { 1466 .read = virtio_pci_notify_read, 1467 .write = virtio_pci_notify_write_pio, 1468 .impl = { 1469 .min_access_size = 1, 1470 .max_access_size = 4, 1471 }, 1472 .endianness = DEVICE_LITTLE_ENDIAN, 1473 }; 1474 g_autoptr(GString) name = g_string_new(NULL); 1475 1476 g_string_printf(name, "virtio-pci-common-%s", vdev_name); 1477 memory_region_init_io(&proxy->common.mr, OBJECT(proxy), 1478 &common_ops, 1479 proxy, 1480 name->str, 1481 proxy->common.size); 1482 1483 g_string_printf(name, "virtio-pci-isr-%s", vdev_name); 1484 memory_region_init_io(&proxy->isr.mr, OBJECT(proxy), 1485 &isr_ops, 1486 proxy, 1487 name->str, 1488 proxy->isr.size); 1489 1490 g_string_printf(name, "virtio-pci-device-%s", vdev_name); 1491 memory_region_init_io(&proxy->device.mr, OBJECT(proxy), 1492 &device_ops, 1493 proxy, 1494 name->str, 1495 proxy->device.size); 1496 1497 g_string_printf(name, "virtio-pci-notify-%s", vdev_name); 1498 memory_region_init_io(&proxy->notify.mr, OBJECT(proxy), 1499 ¬ify_ops, 1500 proxy, 1501 name->str, 1502 proxy->notify.size); 1503 1504 g_string_printf(name, "virtio-pci-notify-pio-%s", vdev_name); 1505 memory_region_init_io(&proxy->notify_pio.mr, OBJECT(proxy), 1506 ¬ify_pio_ops, 1507 proxy, 1508 name->str, 1509 proxy->notify_pio.size); 1510 } 1511 1512 static void virtio_pci_modern_region_map(VirtIOPCIProxy *proxy, 1513 VirtIOPCIRegion *region, 1514 struct virtio_pci_cap *cap, 1515 MemoryRegion *mr, 1516 uint8_t bar) 1517 { 1518 memory_region_add_subregion(mr, region->offset, ®ion->mr); 1519 1520 cap->cfg_type = region->type; 1521 cap->bar = bar; 1522 cap->offset = cpu_to_le32(region->offset); 1523 cap->length = cpu_to_le32(region->size); 1524 virtio_pci_add_mem_cap(proxy, cap); 1525 1526 } 1527 1528 static void virtio_pci_modern_mem_region_map(VirtIOPCIProxy *proxy, 1529 VirtIOPCIRegion *region, 1530 struct virtio_pci_cap *cap) 1531 { 1532 virtio_pci_modern_region_map(proxy, region, cap, 1533 &proxy->modern_bar, proxy->modern_mem_bar_idx); 1534 } 1535 1536 static void virtio_pci_modern_io_region_map(VirtIOPCIProxy *proxy, 1537 VirtIOPCIRegion *region, 1538 struct virtio_pci_cap *cap) 1539 { 1540 virtio_pci_modern_region_map(proxy, region, cap, 1541 &proxy->io_bar, proxy->modern_io_bar_idx); 1542 } 1543 1544 static void virtio_pci_modern_mem_region_unmap(VirtIOPCIProxy *proxy, 1545 VirtIOPCIRegion *region) 1546 { 1547 memory_region_del_subregion(&proxy->modern_bar, 1548 ®ion->mr); 1549 } 1550 1551 static void virtio_pci_modern_io_region_unmap(VirtIOPCIProxy *proxy, 1552 VirtIOPCIRegion *region) 1553 { 1554 memory_region_del_subregion(&proxy->io_bar, 1555 ®ion->mr); 1556 } 1557 1558 static void virtio_pci_pre_plugged(DeviceState *d, Error **errp) 1559 { 1560 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1561 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1562 1563 if (virtio_pci_modern(proxy)) { 1564 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 1565 } 1566 1567 virtio_add_feature(&vdev->host_features, VIRTIO_F_BAD_FEATURE); 1568 } 1569 1570 /* This is called by virtio-bus just after the device is plugged. */ 1571 static void virtio_pci_device_plugged(DeviceState *d, Error **errp) 1572 { 1573 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1574 VirtioBusState *bus = &proxy->bus; 1575 bool legacy = virtio_pci_legacy(proxy); 1576 bool modern; 1577 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 1578 uint8_t *config; 1579 uint32_t size; 1580 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1581 1582 /* 1583 * Virtio capabilities present without 1584 * VIRTIO_F_VERSION_1 confuses guests 1585 */ 1586 if (!proxy->ignore_backend_features && 1587 !virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) { 1588 virtio_pci_disable_modern(proxy); 1589 1590 if (!legacy) { 1591 error_setg(errp, "Device doesn't support modern mode, and legacy" 1592 " mode is disabled"); 1593 error_append_hint(errp, "Set disable-legacy to off\n"); 1594 1595 return; 1596 } 1597 } 1598 1599 modern = virtio_pci_modern(proxy); 1600 1601 config = proxy->pci_dev.config; 1602 if (proxy->class_code) { 1603 pci_config_set_class(config, proxy->class_code); 1604 } 1605 1606 if (legacy) { 1607 if (!virtio_legacy_allowed(vdev)) { 1608 /* 1609 * To avoid migration issues, we allow legacy mode when legacy 1610 * check is disabled in the old machine types (< 5.1). 1611 */ 1612 if (virtio_legacy_check_disabled(vdev)) { 1613 warn_report("device is modern-only, but for backward " 1614 "compatibility legacy is allowed"); 1615 } else { 1616 error_setg(errp, 1617 "device is modern-only, use disable-legacy=on"); 1618 return; 1619 } 1620 } 1621 if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) { 1622 error_setg(errp, "VIRTIO_F_IOMMU_PLATFORM was supported by" 1623 " neither legacy nor transitional device"); 1624 return ; 1625 } 1626 /* 1627 * Legacy and transitional devices use specific subsystem IDs. 1628 * Note that the subsystem vendor ID (config + PCI_SUBSYSTEM_VENDOR_ID) 1629 * is set to PCI_SUBVENDOR_ID_REDHAT_QUMRANET by default. 1630 */ 1631 pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus)); 1632 } else { 1633 /* pure virtio-1.0 */ 1634 pci_set_word(config + PCI_VENDOR_ID, 1635 PCI_VENDOR_ID_REDHAT_QUMRANET); 1636 pci_set_word(config + PCI_DEVICE_ID, 1637 0x1040 + virtio_bus_get_vdev_id(bus)); 1638 pci_config_set_revision(config, 1); 1639 } 1640 config[PCI_INTERRUPT_PIN] = 1; 1641 1642 1643 if (modern) { 1644 struct virtio_pci_cap cap = { 1645 .cap_len = sizeof cap, 1646 }; 1647 struct virtio_pci_notify_cap notify = { 1648 .cap.cap_len = sizeof notify, 1649 .notify_off_multiplier = 1650 cpu_to_le32(virtio_pci_queue_mem_mult(proxy)), 1651 }; 1652 struct virtio_pci_cfg_cap cfg = { 1653 .cap.cap_len = sizeof cfg, 1654 .cap.cfg_type = VIRTIO_PCI_CAP_PCI_CFG, 1655 }; 1656 struct virtio_pci_notify_cap notify_pio = { 1657 .cap.cap_len = sizeof notify, 1658 .notify_off_multiplier = cpu_to_le32(0x0), 1659 }; 1660 1661 struct virtio_pci_cfg_cap *cfg_mask; 1662 1663 virtio_pci_modern_regions_init(proxy, vdev->name); 1664 1665 virtio_pci_modern_mem_region_map(proxy, &proxy->common, &cap); 1666 virtio_pci_modern_mem_region_map(proxy, &proxy->isr, &cap); 1667 virtio_pci_modern_mem_region_map(proxy, &proxy->device, &cap); 1668 virtio_pci_modern_mem_region_map(proxy, &proxy->notify, ¬ify.cap); 1669 1670 if (modern_pio) { 1671 memory_region_init(&proxy->io_bar, OBJECT(proxy), 1672 "virtio-pci-io", 0x4); 1673 1674 pci_register_bar(&proxy->pci_dev, proxy->modern_io_bar_idx, 1675 PCI_BASE_ADDRESS_SPACE_IO, &proxy->io_bar); 1676 1677 virtio_pci_modern_io_region_map(proxy, &proxy->notify_pio, 1678 ¬ify_pio.cap); 1679 } 1680 1681 pci_register_bar(&proxy->pci_dev, proxy->modern_mem_bar_idx, 1682 PCI_BASE_ADDRESS_SPACE_MEMORY | 1683 PCI_BASE_ADDRESS_MEM_PREFETCH | 1684 PCI_BASE_ADDRESS_MEM_TYPE_64, 1685 &proxy->modern_bar); 1686 1687 proxy->config_cap = virtio_pci_add_mem_cap(proxy, &cfg.cap); 1688 cfg_mask = (void *)(proxy->pci_dev.wmask + proxy->config_cap); 1689 pci_set_byte(&cfg_mask->cap.bar, ~0x0); 1690 pci_set_long((uint8_t *)&cfg_mask->cap.offset, ~0x0); 1691 pci_set_long((uint8_t *)&cfg_mask->cap.length, ~0x0); 1692 pci_set_long(cfg_mask->pci_cfg_data, ~0x0); 1693 } 1694 1695 if (proxy->nvectors) { 1696 int err = msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1697 proxy->msix_bar_idx, NULL); 1698 if (err) { 1699 /* Notice when a system that supports MSIx can't initialize it */ 1700 if (err != -ENOTSUP) { 1701 warn_report("unable to init msix vectors to %" PRIu32, 1702 proxy->nvectors); 1703 } 1704 proxy->nvectors = 0; 1705 } 1706 } 1707 1708 proxy->pci_dev.config_write = virtio_write_config; 1709 proxy->pci_dev.config_read = virtio_read_config; 1710 1711 if (legacy) { 1712 size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) 1713 + virtio_bus_get_vdev_config_len(bus); 1714 size = pow2ceil(size); 1715 1716 memory_region_init_io(&proxy->bar, OBJECT(proxy), 1717 &virtio_pci_config_ops, 1718 proxy, "virtio-pci", size); 1719 1720 pci_register_bar(&proxy->pci_dev, proxy->legacy_io_bar_idx, 1721 PCI_BASE_ADDRESS_SPACE_IO, &proxy->bar); 1722 } 1723 } 1724 1725 static void virtio_pci_device_unplugged(DeviceState *d) 1726 { 1727 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1728 bool modern = virtio_pci_modern(proxy); 1729 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 1730 1731 virtio_pci_stop_ioeventfd(proxy); 1732 1733 if (modern) { 1734 virtio_pci_modern_mem_region_unmap(proxy, &proxy->common); 1735 virtio_pci_modern_mem_region_unmap(proxy, &proxy->isr); 1736 virtio_pci_modern_mem_region_unmap(proxy, &proxy->device); 1737 virtio_pci_modern_mem_region_unmap(proxy, &proxy->notify); 1738 if (modern_pio) { 1739 virtio_pci_modern_io_region_unmap(proxy, &proxy->notify_pio); 1740 } 1741 } 1742 } 1743 1744 static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp) 1745 { 1746 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 1747 VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev); 1748 bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) && 1749 !pci_bus_is_root(pci_get_bus(pci_dev)); 1750 1751 if (kvm_enabled() && !kvm_has_many_ioeventfds()) { 1752 proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD; 1753 } 1754 1755 /* 1756 * virtio pci bar layout used by default. 1757 * subclasses can re-arrange things if needed. 1758 * 1759 * region 0 -- virtio legacy io bar 1760 * region 1 -- msi-x bar 1761 * region 2 -- virtio modern io bar (off by default) 1762 * region 4+5 -- virtio modern memory (64bit) bar 1763 * 1764 */ 1765 proxy->legacy_io_bar_idx = 0; 1766 proxy->msix_bar_idx = 1; 1767 proxy->modern_io_bar_idx = 2; 1768 proxy->modern_mem_bar_idx = 4; 1769 1770 proxy->common.offset = 0x0; 1771 proxy->common.size = 0x1000; 1772 proxy->common.type = VIRTIO_PCI_CAP_COMMON_CFG; 1773 1774 proxy->isr.offset = 0x1000; 1775 proxy->isr.size = 0x1000; 1776 proxy->isr.type = VIRTIO_PCI_CAP_ISR_CFG; 1777 1778 proxy->device.offset = 0x2000; 1779 proxy->device.size = 0x1000; 1780 proxy->device.type = VIRTIO_PCI_CAP_DEVICE_CFG; 1781 1782 proxy->notify.offset = 0x3000; 1783 proxy->notify.size = virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX; 1784 proxy->notify.type = VIRTIO_PCI_CAP_NOTIFY_CFG; 1785 1786 proxy->notify_pio.offset = 0x0; 1787 proxy->notify_pio.size = 0x4; 1788 proxy->notify_pio.type = VIRTIO_PCI_CAP_NOTIFY_CFG; 1789 1790 /* subclasses can enforce modern, so do this unconditionally */ 1791 memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci", 1792 /* PCI BAR regions must be powers of 2 */ 1793 pow2ceil(proxy->notify.offset + proxy->notify.size)); 1794 1795 if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) { 1796 proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF; 1797 } 1798 1799 if (!virtio_pci_modern(proxy) && !virtio_pci_legacy(proxy)) { 1800 error_setg(errp, "device cannot work as neither modern nor legacy mode" 1801 " is enabled"); 1802 error_append_hint(errp, "Set either disable-modern or disable-legacy" 1803 " to off\n"); 1804 return; 1805 } 1806 1807 if (pcie_port && pci_is_express(pci_dev)) { 1808 int pos; 1809 uint16_t last_pcie_cap_offset = PCI_CONFIG_SPACE_SIZE; 1810 1811 pos = pcie_endpoint_cap_init(pci_dev, 0); 1812 assert(pos > 0); 1813 1814 pos = pci_add_capability(pci_dev, PCI_CAP_ID_PM, 0, 1815 PCI_PM_SIZEOF, errp); 1816 if (pos < 0) { 1817 return; 1818 } 1819 1820 pci_dev->exp.pm_cap = pos; 1821 1822 /* 1823 * Indicates that this function complies with revision 1.2 of the 1824 * PCI Power Management Interface Specification. 1825 */ 1826 pci_set_word(pci_dev->config + pos + PCI_PM_PMC, 0x3); 1827 1828 if (proxy->flags & VIRTIO_PCI_FLAG_AER) { 1829 pcie_aer_init(pci_dev, PCI_ERR_VER, last_pcie_cap_offset, 1830 PCI_ERR_SIZEOF, NULL); 1831 last_pcie_cap_offset += PCI_ERR_SIZEOF; 1832 } 1833 1834 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_DEVERR) { 1835 /* Init error enabling flags */ 1836 pcie_cap_deverr_init(pci_dev); 1837 } 1838 1839 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_LNKCTL) { 1840 /* Init Link Control Register */ 1841 pcie_cap_lnkctl_init(pci_dev); 1842 } 1843 1844 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_PM) { 1845 /* Init Power Management Control Register */ 1846 pci_set_word(pci_dev->wmask + pos + PCI_PM_CTRL, 1847 PCI_PM_CTRL_STATE_MASK); 1848 } 1849 1850 if (proxy->flags & VIRTIO_PCI_FLAG_ATS) { 1851 pcie_ats_init(pci_dev, last_pcie_cap_offset); 1852 last_pcie_cap_offset += PCI_EXT_CAP_ATS_SIZEOF; 1853 } 1854 1855 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_FLR) { 1856 /* Set Function Level Reset capability bit */ 1857 pcie_cap_flr_init(pci_dev); 1858 } 1859 } else { 1860 /* 1861 * make future invocations of pci_is_express() return false 1862 * and pci_config_size() return PCI_CONFIG_SPACE_SIZE. 1863 */ 1864 pci_dev->cap_present &= ~QEMU_PCI_CAP_EXPRESS; 1865 } 1866 1867 virtio_pci_bus_new(&proxy->bus, sizeof(proxy->bus), proxy); 1868 if (k->realize) { 1869 k->realize(proxy, errp); 1870 } 1871 } 1872 1873 static void virtio_pci_exit(PCIDevice *pci_dev) 1874 { 1875 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 1876 bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) && 1877 !pci_bus_is_root(pci_get_bus(pci_dev)); 1878 1879 msix_uninit_exclusive_bar(pci_dev); 1880 if (proxy->flags & VIRTIO_PCI_FLAG_AER && pcie_port && 1881 pci_is_express(pci_dev)) { 1882 pcie_aer_exit(pci_dev); 1883 } 1884 } 1885 1886 static void virtio_pci_reset(DeviceState *qdev) 1887 { 1888 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev); 1889 VirtioBusState *bus = VIRTIO_BUS(&proxy->bus); 1890 PCIDevice *dev = PCI_DEVICE(qdev); 1891 int i; 1892 1893 virtio_pci_stop_ioeventfd(proxy); 1894 virtio_bus_reset(bus); 1895 msix_unuse_all_vectors(&proxy->pci_dev); 1896 1897 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { 1898 proxy->vqs[i].enabled = 0; 1899 proxy->vqs[i].num = 0; 1900 proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0; 1901 proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0; 1902 proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0; 1903 } 1904 1905 if (pci_is_express(dev)) { 1906 pcie_cap_deverr_reset(dev); 1907 pcie_cap_lnkctl_reset(dev); 1908 1909 pci_set_word(dev->config + dev->exp.pm_cap + PCI_PM_CTRL, 0); 1910 } 1911 } 1912 1913 static Property virtio_pci_properties[] = { 1914 DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy, flags, 1915 VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT, false), 1916 DEFINE_PROP_BIT("migrate-extra", VirtIOPCIProxy, flags, 1917 VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT, true), 1918 DEFINE_PROP_BIT("modern-pio-notify", VirtIOPCIProxy, flags, 1919 VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT, false), 1920 DEFINE_PROP_BIT("x-disable-pcie", VirtIOPCIProxy, flags, 1921 VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT, false), 1922 DEFINE_PROP_BIT("page-per-vq", VirtIOPCIProxy, flags, 1923 VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT, false), 1924 DEFINE_PROP_BOOL("x-ignore-backend-features", VirtIOPCIProxy, 1925 ignore_backend_features, false), 1926 DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags, 1927 VIRTIO_PCI_FLAG_ATS_BIT, false), 1928 DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy, flags, 1929 VIRTIO_PCI_FLAG_INIT_DEVERR_BIT, true), 1930 DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy, flags, 1931 VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT, true), 1932 DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy, flags, 1933 VIRTIO_PCI_FLAG_INIT_PM_BIT, true), 1934 DEFINE_PROP_BIT("x-pcie-flr-init", VirtIOPCIProxy, flags, 1935 VIRTIO_PCI_FLAG_INIT_FLR_BIT, true), 1936 DEFINE_PROP_BIT("aer", VirtIOPCIProxy, flags, 1937 VIRTIO_PCI_FLAG_AER_BIT, false), 1938 DEFINE_PROP_END_OF_LIST(), 1939 }; 1940 1941 static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp) 1942 { 1943 VirtioPCIClass *vpciklass = VIRTIO_PCI_GET_CLASS(qdev); 1944 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev); 1945 PCIDevice *pci_dev = &proxy->pci_dev; 1946 1947 if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) && 1948 virtio_pci_modern(proxy)) { 1949 pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS; 1950 } 1951 1952 vpciklass->parent_dc_realize(qdev, errp); 1953 } 1954 1955 static void virtio_pci_class_init(ObjectClass *klass, void *data) 1956 { 1957 DeviceClass *dc = DEVICE_CLASS(klass); 1958 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 1959 VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass); 1960 1961 device_class_set_props(dc, virtio_pci_properties); 1962 k->realize = virtio_pci_realize; 1963 k->exit = virtio_pci_exit; 1964 k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; 1965 k->revision = VIRTIO_PCI_ABI_VERSION; 1966 k->class_id = PCI_CLASS_OTHERS; 1967 device_class_set_parent_realize(dc, virtio_pci_dc_realize, 1968 &vpciklass->parent_dc_realize); 1969 dc->reset = virtio_pci_reset; 1970 } 1971 1972 static const TypeInfo virtio_pci_info = { 1973 .name = TYPE_VIRTIO_PCI, 1974 .parent = TYPE_PCI_DEVICE, 1975 .instance_size = sizeof(VirtIOPCIProxy), 1976 .class_init = virtio_pci_class_init, 1977 .class_size = sizeof(VirtioPCIClass), 1978 .abstract = true, 1979 }; 1980 1981 static Property virtio_pci_generic_properties[] = { 1982 DEFINE_PROP_ON_OFF_AUTO("disable-legacy", VirtIOPCIProxy, disable_legacy, 1983 ON_OFF_AUTO_AUTO), 1984 DEFINE_PROP_BOOL("disable-modern", VirtIOPCIProxy, disable_modern, false), 1985 DEFINE_PROP_END_OF_LIST(), 1986 }; 1987 1988 static void virtio_pci_base_class_init(ObjectClass *klass, void *data) 1989 { 1990 const VirtioPCIDeviceTypeInfo *t = data; 1991 if (t->class_init) { 1992 t->class_init(klass, NULL); 1993 } 1994 } 1995 1996 static void virtio_pci_generic_class_init(ObjectClass *klass, void *data) 1997 { 1998 DeviceClass *dc = DEVICE_CLASS(klass); 1999 2000 device_class_set_props(dc, virtio_pci_generic_properties); 2001 } 2002 2003 static void virtio_pci_transitional_instance_init(Object *obj) 2004 { 2005 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj); 2006 2007 proxy->disable_legacy = ON_OFF_AUTO_OFF; 2008 proxy->disable_modern = false; 2009 } 2010 2011 static void virtio_pci_non_transitional_instance_init(Object *obj) 2012 { 2013 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj); 2014 2015 proxy->disable_legacy = ON_OFF_AUTO_ON; 2016 proxy->disable_modern = false; 2017 } 2018 2019 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t) 2020 { 2021 char *base_name = NULL; 2022 TypeInfo base_type_info = { 2023 .name = t->base_name, 2024 .parent = t->parent ? t->parent : TYPE_VIRTIO_PCI, 2025 .instance_size = t->instance_size, 2026 .instance_init = t->instance_init, 2027 .class_size = t->class_size, 2028 .abstract = true, 2029 .interfaces = t->interfaces, 2030 }; 2031 TypeInfo generic_type_info = { 2032 .name = t->generic_name, 2033 .parent = base_type_info.name, 2034 .class_init = virtio_pci_generic_class_init, 2035 .interfaces = (InterfaceInfo[]) { 2036 { INTERFACE_PCIE_DEVICE }, 2037 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 2038 { } 2039 }, 2040 }; 2041 2042 if (!base_type_info.name) { 2043 /* No base type -> register a single generic device type */ 2044 /* use intermediate %s-base-type to add generic device props */ 2045 base_name = g_strdup_printf("%s-base-type", t->generic_name); 2046 base_type_info.name = base_name; 2047 base_type_info.class_init = virtio_pci_generic_class_init; 2048 2049 generic_type_info.parent = base_name; 2050 generic_type_info.class_init = virtio_pci_base_class_init; 2051 generic_type_info.class_data = (void *)t; 2052 2053 assert(!t->non_transitional_name); 2054 assert(!t->transitional_name); 2055 } else { 2056 base_type_info.class_init = virtio_pci_base_class_init; 2057 base_type_info.class_data = (void *)t; 2058 } 2059 2060 type_register(&base_type_info); 2061 if (generic_type_info.name) { 2062 type_register(&generic_type_info); 2063 } 2064 2065 if (t->non_transitional_name) { 2066 const TypeInfo non_transitional_type_info = { 2067 .name = t->non_transitional_name, 2068 .parent = base_type_info.name, 2069 .instance_init = virtio_pci_non_transitional_instance_init, 2070 .interfaces = (InterfaceInfo[]) { 2071 { INTERFACE_PCIE_DEVICE }, 2072 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 2073 { } 2074 }, 2075 }; 2076 type_register(&non_transitional_type_info); 2077 } 2078 2079 if (t->transitional_name) { 2080 const TypeInfo transitional_type_info = { 2081 .name = t->transitional_name, 2082 .parent = base_type_info.name, 2083 .instance_init = virtio_pci_transitional_instance_init, 2084 .interfaces = (InterfaceInfo[]) { 2085 /* 2086 * Transitional virtio devices work only as Conventional PCI 2087 * devices because they require PIO ports. 2088 */ 2089 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 2090 { } 2091 }, 2092 }; 2093 type_register(&transitional_type_info); 2094 } 2095 g_free(base_name); 2096 } 2097 2098 unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues) 2099 { 2100 /* 2101 * 1:1 vq to vCPU mapping is ideal because the same vCPU that submitted 2102 * virtqueue buffers can handle their completion. When a different vCPU 2103 * handles completion it may need to IPI the vCPU that submitted the 2104 * request and this adds overhead. 2105 * 2106 * Virtqueues consume guest RAM and MSI-X vectors. This is wasteful in 2107 * guests with very many vCPUs and a device that is only used by a few 2108 * vCPUs. Unfortunately optimizing that case requires manual pinning inside 2109 * the guest, so those users might as well manually set the number of 2110 * queues. There is no upper limit that can be applied automatically and 2111 * doing so arbitrarily would result in a sudden performance drop once the 2112 * threshold number of vCPUs is exceeded. 2113 */ 2114 unsigned num_queues = current_machine->smp.cpus; 2115 2116 /* 2117 * The maximum number of MSI-X vectors is PCI_MSIX_FLAGS_QSIZE + 1, but the 2118 * config change interrupt and the fixed virtqueues must be taken into 2119 * account too. 2120 */ 2121 num_queues = MIN(num_queues, PCI_MSIX_FLAGS_QSIZE - fixed_queues); 2122 2123 /* 2124 * There is a limit to how many virtqueues a device can have. 2125 */ 2126 return MIN(num_queues, VIRTIO_QUEUE_MAX - fixed_queues); 2127 } 2128 2129 /* virtio-pci-bus */ 2130 2131 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size, 2132 VirtIOPCIProxy *dev) 2133 { 2134 DeviceState *qdev = DEVICE(dev); 2135 char virtio_bus_name[] = "virtio-bus"; 2136 2137 qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_PCI_BUS, qdev, 2138 virtio_bus_name); 2139 } 2140 2141 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data) 2142 { 2143 BusClass *bus_class = BUS_CLASS(klass); 2144 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 2145 bus_class->max_dev = 1; 2146 k->notify = virtio_pci_notify; 2147 k->save_config = virtio_pci_save_config; 2148 k->load_config = virtio_pci_load_config; 2149 k->save_queue = virtio_pci_save_queue; 2150 k->load_queue = virtio_pci_load_queue; 2151 k->save_extra_state = virtio_pci_save_extra_state; 2152 k->load_extra_state = virtio_pci_load_extra_state; 2153 k->has_extra_state = virtio_pci_has_extra_state; 2154 k->query_guest_notifiers = virtio_pci_query_guest_notifiers; 2155 k->set_guest_notifiers = virtio_pci_set_guest_notifiers; 2156 k->set_host_notifier_mr = virtio_pci_set_host_notifier_mr; 2157 k->vmstate_change = virtio_pci_vmstate_change; 2158 k->pre_plugged = virtio_pci_pre_plugged; 2159 k->device_plugged = virtio_pci_device_plugged; 2160 k->device_unplugged = virtio_pci_device_unplugged; 2161 k->query_nvectors = virtio_pci_query_nvectors; 2162 k->ioeventfd_enabled = virtio_pci_ioeventfd_enabled; 2163 k->ioeventfd_assign = virtio_pci_ioeventfd_assign; 2164 k->get_dma_as = virtio_pci_get_dma_as; 2165 k->queue_enabled = virtio_pci_queue_enabled; 2166 } 2167 2168 static const TypeInfo virtio_pci_bus_info = { 2169 .name = TYPE_VIRTIO_PCI_BUS, 2170 .parent = TYPE_VIRTIO_BUS, 2171 .instance_size = sizeof(VirtioPCIBusState), 2172 .class_size = sizeof(VirtioPCIBusClass), 2173 .class_init = virtio_pci_bus_class_init, 2174 }; 2175 2176 static void virtio_pci_register_types(void) 2177 { 2178 /* Base types: */ 2179 type_register_static(&virtio_pci_bus_info); 2180 type_register_static(&virtio_pci_info); 2181 } 2182 2183 type_init(virtio_pci_register_types) 2184 2185