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