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 "standard-headers/linux/virtio_pci.h" 21 #include "hw/virtio/virtio.h" 22 #include "hw/pci/pci.h" 23 #include "qapi/error.h" 24 #include "qemu/error-report.h" 25 #include "hw/pci/msi.h" 26 #include "hw/pci/msix.h" 27 #include "hw/loader.h" 28 #include "sysemu/kvm.h" 29 #include "virtio-pci.h" 30 #include "qemu/range.h" 31 #include "hw/virtio/virtio-bus.h" 32 #include "qapi/visitor.h" 33 34 #define VIRTIO_PCI_REGION_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_present(dev)) 35 36 #undef VIRTIO_PCI_CONFIG 37 38 /* The remaining space is defined by each driver as the per-driver 39 * configuration space */ 40 #define VIRTIO_PCI_CONFIG_SIZE(dev) VIRTIO_PCI_CONFIG_OFF(msix_enabled(dev)) 41 42 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size, 43 VirtIOPCIProxy *dev); 44 static void virtio_pci_reset(DeviceState *qdev); 45 46 /* virtio device */ 47 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */ 48 static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d) 49 { 50 return container_of(d, VirtIOPCIProxy, pci_dev.qdev); 51 } 52 53 /* DeviceState to VirtIOPCIProxy. Note: used on datapath, 54 * be careful and test performance if you change this. 55 */ 56 static inline VirtIOPCIProxy *to_virtio_pci_proxy_fast(DeviceState *d) 57 { 58 return container_of(d, VirtIOPCIProxy, pci_dev.qdev); 59 } 60 61 static void virtio_pci_notify(DeviceState *d, uint16_t vector) 62 { 63 VirtIOPCIProxy *proxy = to_virtio_pci_proxy_fast(d); 64 65 if (msix_enabled(&proxy->pci_dev)) 66 msix_notify(&proxy->pci_dev, vector); 67 else { 68 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 69 pci_set_irq(&proxy->pci_dev, atomic_read(&vdev->isr) & 1); 70 } 71 } 72 73 static void virtio_pci_save_config(DeviceState *d, QEMUFile *f) 74 { 75 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 76 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 77 78 pci_device_save(&proxy->pci_dev, f); 79 msix_save(&proxy->pci_dev, f); 80 if (msix_present(&proxy->pci_dev)) 81 qemu_put_be16(f, vdev->config_vector); 82 } 83 84 static const VMStateDescription vmstate_virtio_pci_modern_queue_state = { 85 .name = "virtio_pci/modern_queue_state", 86 .version_id = 1, 87 .minimum_version_id = 1, 88 .fields = (VMStateField[]) { 89 VMSTATE_UINT16(num, VirtIOPCIQueue), 90 VMSTATE_UNUSED(1), /* enabled was stored as be16 */ 91 VMSTATE_BOOL(enabled, VirtIOPCIQueue), 92 VMSTATE_UINT32_ARRAY(desc, VirtIOPCIQueue, 2), 93 VMSTATE_UINT32_ARRAY(avail, VirtIOPCIQueue, 2), 94 VMSTATE_UINT32_ARRAY(used, VirtIOPCIQueue, 2), 95 VMSTATE_END_OF_LIST() 96 } 97 }; 98 99 static bool virtio_pci_modern_state_needed(void *opaque) 100 { 101 VirtIOPCIProxy *proxy = opaque; 102 103 return virtio_pci_modern(proxy); 104 } 105 106 static const VMStateDescription vmstate_virtio_pci_modern_state_sub = { 107 .name = "virtio_pci/modern_state", 108 .version_id = 1, 109 .minimum_version_id = 1, 110 .needed = &virtio_pci_modern_state_needed, 111 .fields = (VMStateField[]) { 112 VMSTATE_UINT32(dfselect, VirtIOPCIProxy), 113 VMSTATE_UINT32(gfselect, VirtIOPCIProxy), 114 VMSTATE_UINT32_ARRAY(guest_features, VirtIOPCIProxy, 2), 115 VMSTATE_STRUCT_ARRAY(vqs, VirtIOPCIProxy, VIRTIO_QUEUE_MAX, 0, 116 vmstate_virtio_pci_modern_queue_state, 117 VirtIOPCIQueue), 118 VMSTATE_END_OF_LIST() 119 } 120 }; 121 122 static const VMStateDescription vmstate_virtio_pci = { 123 .name = "virtio_pci", 124 .version_id = 1, 125 .minimum_version_id = 1, 126 .minimum_version_id_old = 1, 127 .fields = (VMStateField[]) { 128 VMSTATE_END_OF_LIST() 129 }, 130 .subsections = (const VMStateDescription*[]) { 131 &vmstate_virtio_pci_modern_state_sub, 132 NULL 133 } 134 }; 135 136 static bool virtio_pci_has_extra_state(DeviceState *d) 137 { 138 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 139 140 return proxy->flags & VIRTIO_PCI_FLAG_MIGRATE_EXTRA; 141 } 142 143 static void virtio_pci_save_extra_state(DeviceState *d, QEMUFile *f) 144 { 145 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 146 147 vmstate_save_state(f, &vmstate_virtio_pci, proxy, NULL); 148 } 149 150 static int virtio_pci_load_extra_state(DeviceState *d, QEMUFile *f) 151 { 152 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 153 154 return vmstate_load_state(f, &vmstate_virtio_pci, proxy, 1); 155 } 156 157 static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f) 158 { 159 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 160 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 161 162 if (msix_present(&proxy->pci_dev)) 163 qemu_put_be16(f, virtio_queue_vector(vdev, n)); 164 } 165 166 static int virtio_pci_load_config(DeviceState *d, QEMUFile *f) 167 { 168 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 169 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 170 171 int ret; 172 ret = pci_device_load(&proxy->pci_dev, f); 173 if (ret) { 174 return ret; 175 } 176 msix_unuse_all_vectors(&proxy->pci_dev); 177 msix_load(&proxy->pci_dev, f); 178 if (msix_present(&proxy->pci_dev)) { 179 qemu_get_be16s(f, &vdev->config_vector); 180 } else { 181 vdev->config_vector = VIRTIO_NO_VECTOR; 182 } 183 if (vdev->config_vector != VIRTIO_NO_VECTOR) { 184 return msix_vector_use(&proxy->pci_dev, vdev->config_vector); 185 } 186 return 0; 187 } 188 189 static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f) 190 { 191 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 192 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 193 194 uint16_t vector; 195 if (msix_present(&proxy->pci_dev)) { 196 qemu_get_be16s(f, &vector); 197 } else { 198 vector = VIRTIO_NO_VECTOR; 199 } 200 virtio_queue_set_vector(vdev, n, vector); 201 if (vector != VIRTIO_NO_VECTOR) { 202 return msix_vector_use(&proxy->pci_dev, vector); 203 } 204 205 return 0; 206 } 207 208 static bool virtio_pci_ioeventfd_enabled(DeviceState *d) 209 { 210 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 211 212 return (proxy->flags & VIRTIO_PCI_FLAG_USE_IOEVENTFD) != 0; 213 } 214 215 #define QEMU_VIRTIO_PCI_QUEUE_MEM_MULT 0x1000 216 217 static inline int virtio_pci_queue_mem_mult(struct VirtIOPCIProxy *proxy) 218 { 219 return (proxy->flags & VIRTIO_PCI_FLAG_PAGE_PER_VQ) ? 220 QEMU_VIRTIO_PCI_QUEUE_MEM_MULT : 4; 221 } 222 223 static int virtio_pci_ioeventfd_assign(DeviceState *d, EventNotifier *notifier, 224 int n, bool assign) 225 { 226 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 227 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 228 VirtQueue *vq = virtio_get_queue(vdev, n); 229 bool legacy = virtio_pci_legacy(proxy); 230 bool modern = virtio_pci_modern(proxy); 231 bool fast_mmio = kvm_ioeventfd_any_length_enabled(); 232 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 233 MemoryRegion *modern_mr = &proxy->notify.mr; 234 MemoryRegion *modern_notify_mr = &proxy->notify_pio.mr; 235 MemoryRegion *legacy_mr = &proxy->bar; 236 hwaddr modern_addr = virtio_pci_queue_mem_mult(proxy) * 237 virtio_get_queue_index(vq); 238 hwaddr legacy_addr = VIRTIO_PCI_QUEUE_NOTIFY; 239 240 if (assign) { 241 if (modern) { 242 if (fast_mmio) { 243 memory_region_add_eventfd(modern_mr, modern_addr, 0, 244 false, n, notifier); 245 } else { 246 memory_region_add_eventfd(modern_mr, modern_addr, 2, 247 false, n, notifier); 248 } 249 if (modern_pio) { 250 memory_region_add_eventfd(modern_notify_mr, 0, 2, 251 true, n, notifier); 252 } 253 } 254 if (legacy) { 255 memory_region_add_eventfd(legacy_mr, legacy_addr, 2, 256 true, n, notifier); 257 } 258 } else { 259 if (modern) { 260 if (fast_mmio) { 261 memory_region_del_eventfd(modern_mr, modern_addr, 0, 262 false, n, notifier); 263 } else { 264 memory_region_del_eventfd(modern_mr, modern_addr, 2, 265 false, n, notifier); 266 } 267 if (modern_pio) { 268 memory_region_del_eventfd(modern_notify_mr, 0, 2, 269 true, n, notifier); 270 } 271 } 272 if (legacy) { 273 memory_region_del_eventfd(legacy_mr, legacy_addr, 2, 274 true, n, notifier); 275 } 276 } 277 return 0; 278 } 279 280 static void virtio_pci_start_ioeventfd(VirtIOPCIProxy *proxy) 281 { 282 virtio_bus_start_ioeventfd(&proxy->bus); 283 } 284 285 static void virtio_pci_stop_ioeventfd(VirtIOPCIProxy *proxy) 286 { 287 virtio_bus_stop_ioeventfd(&proxy->bus); 288 } 289 290 static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val) 291 { 292 VirtIOPCIProxy *proxy = opaque; 293 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 294 hwaddr pa; 295 296 switch (addr) { 297 case VIRTIO_PCI_GUEST_FEATURES: 298 /* Guest does not negotiate properly? We have to assume nothing. */ 299 if (val & (1 << VIRTIO_F_BAD_FEATURE)) { 300 val = virtio_bus_get_vdev_bad_features(&proxy->bus); 301 } 302 virtio_set_features(vdev, val); 303 break; 304 case VIRTIO_PCI_QUEUE_PFN: 305 pa = (hwaddr)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT; 306 if (pa == 0) { 307 virtio_pci_reset(DEVICE(proxy)); 308 } 309 else 310 virtio_queue_set_addr(vdev, vdev->queue_sel, pa); 311 break; 312 case VIRTIO_PCI_QUEUE_SEL: 313 if (val < VIRTIO_QUEUE_MAX) 314 vdev->queue_sel = val; 315 break; 316 case VIRTIO_PCI_QUEUE_NOTIFY: 317 if (val < VIRTIO_QUEUE_MAX) { 318 virtio_queue_notify(vdev, val); 319 } 320 break; 321 case VIRTIO_PCI_STATUS: 322 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) { 323 virtio_pci_stop_ioeventfd(proxy); 324 } 325 326 virtio_set_status(vdev, val & 0xFF); 327 328 if (val & VIRTIO_CONFIG_S_DRIVER_OK) { 329 virtio_pci_start_ioeventfd(proxy); 330 } 331 332 if (vdev->status == 0) { 333 virtio_pci_reset(DEVICE(proxy)); 334 } 335 336 /* Linux before 2.6.34 drives the device without enabling 337 the PCI device bus master bit. Enable it automatically 338 for the guest. This is a PCI spec violation but so is 339 initiating DMA with bus master bit clear. */ 340 if (val == (VIRTIO_CONFIG_S_ACKNOWLEDGE | VIRTIO_CONFIG_S_DRIVER)) { 341 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND, 342 proxy->pci_dev.config[PCI_COMMAND] | 343 PCI_COMMAND_MASTER, 1); 344 } 345 break; 346 case VIRTIO_MSI_CONFIG_VECTOR: 347 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector); 348 /* Make it possible for guest to discover an error took place. */ 349 if (msix_vector_use(&proxy->pci_dev, val) < 0) 350 val = VIRTIO_NO_VECTOR; 351 vdev->config_vector = val; 352 break; 353 case VIRTIO_MSI_QUEUE_VECTOR: 354 msix_vector_unuse(&proxy->pci_dev, 355 virtio_queue_vector(vdev, vdev->queue_sel)); 356 /* Make it possible for guest to discover an error took place. */ 357 if (msix_vector_use(&proxy->pci_dev, val) < 0) 358 val = VIRTIO_NO_VECTOR; 359 virtio_queue_set_vector(vdev, vdev->queue_sel, val); 360 break; 361 default: 362 error_report("%s: unexpected address 0x%x value 0x%x", 363 __func__, addr, val); 364 break; 365 } 366 } 367 368 static uint32_t virtio_ioport_read(VirtIOPCIProxy *proxy, uint32_t addr) 369 { 370 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 371 uint32_t ret = 0xFFFFFFFF; 372 373 switch (addr) { 374 case VIRTIO_PCI_HOST_FEATURES: 375 ret = vdev->host_features; 376 break; 377 case VIRTIO_PCI_GUEST_FEATURES: 378 ret = vdev->guest_features; 379 break; 380 case VIRTIO_PCI_QUEUE_PFN: 381 ret = virtio_queue_get_addr(vdev, vdev->queue_sel) 382 >> VIRTIO_PCI_QUEUE_ADDR_SHIFT; 383 break; 384 case VIRTIO_PCI_QUEUE_NUM: 385 ret = virtio_queue_get_num(vdev, vdev->queue_sel); 386 break; 387 case VIRTIO_PCI_QUEUE_SEL: 388 ret = vdev->queue_sel; 389 break; 390 case VIRTIO_PCI_STATUS: 391 ret = vdev->status; 392 break; 393 case VIRTIO_PCI_ISR: 394 /* reading from the ISR also clears it. */ 395 ret = atomic_xchg(&vdev->isr, 0); 396 pci_irq_deassert(&proxy->pci_dev); 397 break; 398 case VIRTIO_MSI_CONFIG_VECTOR: 399 ret = vdev->config_vector; 400 break; 401 case VIRTIO_MSI_QUEUE_VECTOR: 402 ret = virtio_queue_vector(vdev, vdev->queue_sel); 403 break; 404 default: 405 break; 406 } 407 408 return ret; 409 } 410 411 static uint64_t virtio_pci_config_read(void *opaque, hwaddr addr, 412 unsigned size) 413 { 414 VirtIOPCIProxy *proxy = opaque; 415 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 416 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev); 417 uint64_t val = 0; 418 if (addr < config) { 419 return virtio_ioport_read(proxy, addr); 420 } 421 addr -= config; 422 423 switch (size) { 424 case 1: 425 val = virtio_config_readb(vdev, addr); 426 break; 427 case 2: 428 val = virtio_config_readw(vdev, addr); 429 if (virtio_is_big_endian(vdev)) { 430 val = bswap16(val); 431 } 432 break; 433 case 4: 434 val = virtio_config_readl(vdev, addr); 435 if (virtio_is_big_endian(vdev)) { 436 val = bswap32(val); 437 } 438 break; 439 } 440 return val; 441 } 442 443 static void virtio_pci_config_write(void *opaque, hwaddr addr, 444 uint64_t val, unsigned size) 445 { 446 VirtIOPCIProxy *proxy = opaque; 447 uint32_t config = VIRTIO_PCI_CONFIG_SIZE(&proxy->pci_dev); 448 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 449 if (addr < config) { 450 virtio_ioport_write(proxy, addr, val); 451 return; 452 } 453 addr -= config; 454 /* 455 * Virtio-PCI is odd. Ioports are LE but config space is target native 456 * endian. 457 */ 458 switch (size) { 459 case 1: 460 virtio_config_writeb(vdev, addr, val); 461 break; 462 case 2: 463 if (virtio_is_big_endian(vdev)) { 464 val = bswap16(val); 465 } 466 virtio_config_writew(vdev, addr, val); 467 break; 468 case 4: 469 if (virtio_is_big_endian(vdev)) { 470 val = bswap32(val); 471 } 472 virtio_config_writel(vdev, addr, val); 473 break; 474 } 475 } 476 477 static const MemoryRegionOps virtio_pci_config_ops = { 478 .read = virtio_pci_config_read, 479 .write = virtio_pci_config_write, 480 .impl = { 481 .min_access_size = 1, 482 .max_access_size = 4, 483 }, 484 .endianness = DEVICE_LITTLE_ENDIAN, 485 }; 486 487 static MemoryRegion *virtio_address_space_lookup(VirtIOPCIProxy *proxy, 488 hwaddr *off, int len) 489 { 490 int i; 491 VirtIOPCIRegion *reg; 492 493 for (i = 0; i < ARRAY_SIZE(proxy->regs); ++i) { 494 reg = &proxy->regs[i]; 495 if (*off >= reg->offset && 496 *off + len <= reg->offset + reg->size) { 497 *off -= reg->offset; 498 return ®->mr; 499 } 500 } 501 502 return NULL; 503 } 504 505 /* Below are generic functions to do memcpy from/to an address space, 506 * without byteswaps, with input validation. 507 * 508 * As regular address_space_* APIs all do some kind of byteswap at least for 509 * some host/target combinations, we are forced to explicitly convert to a 510 * known-endianness integer value. 511 * It doesn't really matter which endian format to go through, so the code 512 * below selects the endian that causes the least amount of work on the given 513 * host. 514 * 515 * Note: host pointer must be aligned. 516 */ 517 static 518 void virtio_address_space_write(VirtIOPCIProxy *proxy, hwaddr addr, 519 const uint8_t *buf, int len) 520 { 521 uint64_t val; 522 MemoryRegion *mr; 523 524 /* address_space_* APIs assume an aligned address. 525 * As address is under guest control, handle illegal values. 526 */ 527 addr &= ~(len - 1); 528 529 mr = virtio_address_space_lookup(proxy, &addr, len); 530 if (!mr) { 531 return; 532 } 533 534 /* Make sure caller aligned buf properly */ 535 assert(!(((uintptr_t)buf) & (len - 1))); 536 537 switch (len) { 538 case 1: 539 val = pci_get_byte(buf); 540 break; 541 case 2: 542 val = cpu_to_le16(pci_get_word(buf)); 543 break; 544 case 4: 545 val = cpu_to_le32(pci_get_long(buf)); 546 break; 547 default: 548 /* As length is under guest control, handle illegal values. */ 549 return; 550 } 551 memory_region_dispatch_write(mr, addr, val, len, MEMTXATTRS_UNSPECIFIED); 552 } 553 554 static void 555 virtio_address_space_read(VirtIOPCIProxy *proxy, hwaddr addr, 556 uint8_t *buf, int len) 557 { 558 uint64_t val; 559 MemoryRegion *mr; 560 561 /* address_space_* APIs assume an aligned address. 562 * As address is under guest control, handle illegal values. 563 */ 564 addr &= ~(len - 1); 565 566 mr = virtio_address_space_lookup(proxy, &addr, len); 567 if (!mr) { 568 return; 569 } 570 571 /* Make sure caller aligned buf properly */ 572 assert(!(((uintptr_t)buf) & (len - 1))); 573 574 memory_region_dispatch_read(mr, addr, &val, len, MEMTXATTRS_UNSPECIFIED); 575 switch (len) { 576 case 1: 577 pci_set_byte(buf, val); 578 break; 579 case 2: 580 pci_set_word(buf, le16_to_cpu(val)); 581 break; 582 case 4: 583 pci_set_long(buf, le32_to_cpu(val)); 584 break; 585 default: 586 /* As length is under guest control, handle illegal values. */ 587 break; 588 } 589 } 590 591 static void virtio_write_config(PCIDevice *pci_dev, uint32_t address, 592 uint32_t val, int len) 593 { 594 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 595 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 596 struct virtio_pci_cfg_cap *cfg; 597 598 pci_default_write_config(pci_dev, address, val, len); 599 600 if (range_covers_byte(address, len, PCI_COMMAND) && 601 !(pci_dev->config[PCI_COMMAND] & PCI_COMMAND_MASTER)) { 602 virtio_pci_stop_ioeventfd(proxy); 603 virtio_set_status(vdev, vdev->status & ~VIRTIO_CONFIG_S_DRIVER_OK); 604 } 605 606 if (proxy->config_cap && 607 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap, 608 pci_cfg_data), 609 sizeof cfg->pci_cfg_data)) { 610 uint32_t off; 611 uint32_t len; 612 613 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap); 614 off = le32_to_cpu(cfg->cap.offset); 615 len = le32_to_cpu(cfg->cap.length); 616 617 if (len == 1 || len == 2 || len == 4) { 618 assert(len <= sizeof cfg->pci_cfg_data); 619 virtio_address_space_write(proxy, off, cfg->pci_cfg_data, len); 620 } 621 } 622 } 623 624 static uint32_t virtio_read_config(PCIDevice *pci_dev, 625 uint32_t address, int len) 626 { 627 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 628 struct virtio_pci_cfg_cap *cfg; 629 630 if (proxy->config_cap && 631 ranges_overlap(address, len, proxy->config_cap + offsetof(struct virtio_pci_cfg_cap, 632 pci_cfg_data), 633 sizeof cfg->pci_cfg_data)) { 634 uint32_t off; 635 uint32_t len; 636 637 cfg = (void *)(proxy->pci_dev.config + proxy->config_cap); 638 off = le32_to_cpu(cfg->cap.offset); 639 len = le32_to_cpu(cfg->cap.length); 640 641 if (len == 1 || len == 2 || len == 4) { 642 assert(len <= sizeof cfg->pci_cfg_data); 643 virtio_address_space_read(proxy, off, cfg->pci_cfg_data, len); 644 } 645 } 646 647 return pci_default_read_config(pci_dev, address, len); 648 } 649 650 static int kvm_virtio_pci_vq_vector_use(VirtIOPCIProxy *proxy, 651 unsigned int queue_no, 652 unsigned int vector) 653 { 654 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 655 int ret; 656 657 if (irqfd->users == 0) { 658 ret = kvm_irqchip_add_msi_route(kvm_state, vector, &proxy->pci_dev); 659 if (ret < 0) { 660 return ret; 661 } 662 irqfd->virq = ret; 663 } 664 irqfd->users++; 665 return 0; 666 } 667 668 static void kvm_virtio_pci_vq_vector_release(VirtIOPCIProxy *proxy, 669 unsigned int vector) 670 { 671 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 672 if (--irqfd->users == 0) { 673 kvm_irqchip_release_virq(kvm_state, irqfd->virq); 674 } 675 } 676 677 static int kvm_virtio_pci_irqfd_use(VirtIOPCIProxy *proxy, 678 unsigned int queue_no, 679 unsigned int vector) 680 { 681 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 682 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 683 VirtQueue *vq = virtio_get_queue(vdev, queue_no); 684 EventNotifier *n = virtio_queue_get_guest_notifier(vq); 685 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, n, NULL, irqfd->virq); 686 } 687 688 static void kvm_virtio_pci_irqfd_release(VirtIOPCIProxy *proxy, 689 unsigned int queue_no, 690 unsigned int vector) 691 { 692 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 693 VirtQueue *vq = virtio_get_queue(vdev, queue_no); 694 EventNotifier *n = virtio_queue_get_guest_notifier(vq); 695 VirtIOIRQFD *irqfd = &proxy->vector_irqfd[vector]; 696 int ret; 697 698 ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, n, irqfd->virq); 699 assert(ret == 0); 700 } 701 702 static int kvm_virtio_pci_vector_use(VirtIOPCIProxy *proxy, int nvqs) 703 { 704 PCIDevice *dev = &proxy->pci_dev; 705 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 706 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 707 unsigned int vector; 708 int ret, queue_no; 709 710 for (queue_no = 0; queue_no < nvqs; queue_no++) { 711 if (!virtio_queue_get_num(vdev, queue_no)) { 712 break; 713 } 714 vector = virtio_queue_vector(vdev, queue_no); 715 if (vector >= msix_nr_vectors_allocated(dev)) { 716 continue; 717 } 718 ret = kvm_virtio_pci_vq_vector_use(proxy, queue_no, vector); 719 if (ret < 0) { 720 goto undo; 721 } 722 /* If guest supports masking, set up irqfd now. 723 * Otherwise, delay until unmasked in the frontend. 724 */ 725 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 726 ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector); 727 if (ret < 0) { 728 kvm_virtio_pci_vq_vector_release(proxy, vector); 729 goto undo; 730 } 731 } 732 } 733 return 0; 734 735 undo: 736 while (--queue_no >= 0) { 737 vector = virtio_queue_vector(vdev, queue_no); 738 if (vector >= msix_nr_vectors_allocated(dev)) { 739 continue; 740 } 741 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 742 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector); 743 } 744 kvm_virtio_pci_vq_vector_release(proxy, vector); 745 } 746 return ret; 747 } 748 749 static void kvm_virtio_pci_vector_release(VirtIOPCIProxy *proxy, int nvqs) 750 { 751 PCIDevice *dev = &proxy->pci_dev; 752 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 753 unsigned int vector; 754 int queue_no; 755 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 756 757 for (queue_no = 0; queue_no < nvqs; queue_no++) { 758 if (!virtio_queue_get_num(vdev, queue_no)) { 759 break; 760 } 761 vector = virtio_queue_vector(vdev, queue_no); 762 if (vector >= msix_nr_vectors_allocated(dev)) { 763 continue; 764 } 765 /* If guest supports masking, clean up irqfd now. 766 * Otherwise, it was cleaned when masked in the frontend. 767 */ 768 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 769 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector); 770 } 771 kvm_virtio_pci_vq_vector_release(proxy, vector); 772 } 773 } 774 775 static int virtio_pci_vq_vector_unmask(VirtIOPCIProxy *proxy, 776 unsigned int queue_no, 777 unsigned int vector, 778 MSIMessage msg) 779 { 780 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 781 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 782 VirtQueue *vq = virtio_get_queue(vdev, queue_no); 783 EventNotifier *n = virtio_queue_get_guest_notifier(vq); 784 VirtIOIRQFD *irqfd; 785 int ret = 0; 786 787 if (proxy->vector_irqfd) { 788 irqfd = &proxy->vector_irqfd[vector]; 789 if (irqfd->msg.data != msg.data || irqfd->msg.address != msg.address) { 790 ret = kvm_irqchip_update_msi_route(kvm_state, irqfd->virq, msg, 791 &proxy->pci_dev); 792 if (ret < 0) { 793 return ret; 794 } 795 kvm_irqchip_commit_routes(kvm_state); 796 } 797 } 798 799 /* If guest supports masking, irqfd is already setup, unmask it. 800 * Otherwise, set it up now. 801 */ 802 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 803 k->guest_notifier_mask(vdev, queue_no, false); 804 /* Test after unmasking to avoid losing events. */ 805 if (k->guest_notifier_pending && 806 k->guest_notifier_pending(vdev, queue_no)) { 807 event_notifier_set(n); 808 } 809 } else { 810 ret = kvm_virtio_pci_irqfd_use(proxy, queue_no, vector); 811 } 812 return ret; 813 } 814 815 static void virtio_pci_vq_vector_mask(VirtIOPCIProxy *proxy, 816 unsigned int queue_no, 817 unsigned int vector) 818 { 819 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 820 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 821 822 /* If guest supports masking, keep irqfd but mask it. 823 * Otherwise, clean it up now. 824 */ 825 if (vdev->use_guest_notifier_mask && k->guest_notifier_mask) { 826 k->guest_notifier_mask(vdev, queue_no, true); 827 } else { 828 kvm_virtio_pci_irqfd_release(proxy, queue_no, vector); 829 } 830 } 831 832 static int virtio_pci_vector_unmask(PCIDevice *dev, unsigned vector, 833 MSIMessage msg) 834 { 835 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 836 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 837 VirtQueue *vq = virtio_vector_first_queue(vdev, vector); 838 int ret, index, unmasked = 0; 839 840 while (vq) { 841 index = virtio_get_queue_index(vq); 842 if (!virtio_queue_get_num(vdev, index)) { 843 break; 844 } 845 if (index < proxy->nvqs_with_notifiers) { 846 ret = virtio_pci_vq_vector_unmask(proxy, index, vector, msg); 847 if (ret < 0) { 848 goto undo; 849 } 850 ++unmasked; 851 } 852 vq = virtio_vector_next_queue(vq); 853 } 854 855 return 0; 856 857 undo: 858 vq = virtio_vector_first_queue(vdev, vector); 859 while (vq && unmasked >= 0) { 860 index = virtio_get_queue_index(vq); 861 if (index < proxy->nvqs_with_notifiers) { 862 virtio_pci_vq_vector_mask(proxy, index, vector); 863 --unmasked; 864 } 865 vq = virtio_vector_next_queue(vq); 866 } 867 return ret; 868 } 869 870 static void virtio_pci_vector_mask(PCIDevice *dev, unsigned vector) 871 { 872 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 873 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 874 VirtQueue *vq = virtio_vector_first_queue(vdev, vector); 875 int index; 876 877 while (vq) { 878 index = virtio_get_queue_index(vq); 879 if (!virtio_queue_get_num(vdev, index)) { 880 break; 881 } 882 if (index < proxy->nvqs_with_notifiers) { 883 virtio_pci_vq_vector_mask(proxy, index, vector); 884 } 885 vq = virtio_vector_next_queue(vq); 886 } 887 } 888 889 static void virtio_pci_vector_poll(PCIDevice *dev, 890 unsigned int vector_start, 891 unsigned int vector_end) 892 { 893 VirtIOPCIProxy *proxy = container_of(dev, VirtIOPCIProxy, pci_dev); 894 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 895 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 896 int queue_no; 897 unsigned int vector; 898 EventNotifier *notifier; 899 VirtQueue *vq; 900 901 for (queue_no = 0; queue_no < proxy->nvqs_with_notifiers; queue_no++) { 902 if (!virtio_queue_get_num(vdev, queue_no)) { 903 break; 904 } 905 vector = virtio_queue_vector(vdev, queue_no); 906 if (vector < vector_start || vector >= vector_end || 907 !msix_is_masked(dev, vector)) { 908 continue; 909 } 910 vq = virtio_get_queue(vdev, queue_no); 911 notifier = virtio_queue_get_guest_notifier(vq); 912 if (k->guest_notifier_pending) { 913 if (k->guest_notifier_pending(vdev, queue_no)) { 914 msix_set_pending(dev, vector); 915 } 916 } else if (event_notifier_test_and_clear(notifier)) { 917 msix_set_pending(dev, vector); 918 } 919 } 920 } 921 922 static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign, 923 bool with_irqfd) 924 { 925 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 926 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 927 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 928 VirtQueue *vq = virtio_get_queue(vdev, n); 929 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 930 931 if (assign) { 932 int r = event_notifier_init(notifier, 0); 933 if (r < 0) { 934 return r; 935 } 936 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); 937 } else { 938 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); 939 event_notifier_cleanup(notifier); 940 } 941 942 if (!msix_enabled(&proxy->pci_dev) && 943 vdev->use_guest_notifier_mask && 944 vdc->guest_notifier_mask) { 945 vdc->guest_notifier_mask(vdev, n, !assign); 946 } 947 948 return 0; 949 } 950 951 static bool virtio_pci_query_guest_notifiers(DeviceState *d) 952 { 953 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 954 return msix_enabled(&proxy->pci_dev); 955 } 956 957 static int virtio_pci_set_guest_notifiers(DeviceState *d, int nvqs, bool assign) 958 { 959 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 960 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 961 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 962 int r, n; 963 bool with_irqfd = msix_enabled(&proxy->pci_dev) && 964 kvm_msi_via_irqfd_enabled(); 965 966 nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX); 967 968 /* When deassigning, pass a consistent nvqs value 969 * to avoid leaking notifiers. 970 */ 971 assert(assign || nvqs == proxy->nvqs_with_notifiers); 972 973 proxy->nvqs_with_notifiers = nvqs; 974 975 /* Must unset vector notifier while guest notifier is still assigned */ 976 if ((proxy->vector_irqfd || k->guest_notifier_mask) && !assign) { 977 msix_unset_vector_notifiers(&proxy->pci_dev); 978 if (proxy->vector_irqfd) { 979 kvm_virtio_pci_vector_release(proxy, nvqs); 980 g_free(proxy->vector_irqfd); 981 proxy->vector_irqfd = NULL; 982 } 983 } 984 985 for (n = 0; n < nvqs; n++) { 986 if (!virtio_queue_get_num(vdev, n)) { 987 break; 988 } 989 990 r = virtio_pci_set_guest_notifier(d, n, assign, with_irqfd); 991 if (r < 0) { 992 goto assign_error; 993 } 994 } 995 996 /* Must set vector notifier after guest notifier has been assigned */ 997 if ((with_irqfd || k->guest_notifier_mask) && assign) { 998 if (with_irqfd) { 999 proxy->vector_irqfd = 1000 g_malloc0(sizeof(*proxy->vector_irqfd) * 1001 msix_nr_vectors_allocated(&proxy->pci_dev)); 1002 r = kvm_virtio_pci_vector_use(proxy, nvqs); 1003 if (r < 0) { 1004 goto assign_error; 1005 } 1006 } 1007 r = msix_set_vector_notifiers(&proxy->pci_dev, 1008 virtio_pci_vector_unmask, 1009 virtio_pci_vector_mask, 1010 virtio_pci_vector_poll); 1011 if (r < 0) { 1012 goto notifiers_error; 1013 } 1014 } 1015 1016 return 0; 1017 1018 notifiers_error: 1019 if (with_irqfd) { 1020 assert(assign); 1021 kvm_virtio_pci_vector_release(proxy, nvqs); 1022 } 1023 1024 assign_error: 1025 /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */ 1026 assert(assign); 1027 while (--n >= 0) { 1028 virtio_pci_set_guest_notifier(d, n, !assign, with_irqfd); 1029 } 1030 return r; 1031 } 1032 1033 static int virtio_pci_set_host_notifier_mr(DeviceState *d, int n, 1034 MemoryRegion *mr, bool assign) 1035 { 1036 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1037 int offset; 1038 1039 if (n >= VIRTIO_QUEUE_MAX || !virtio_pci_modern(proxy) || 1040 virtio_pci_queue_mem_mult(proxy) != memory_region_size(mr)) { 1041 return -1; 1042 } 1043 1044 if (assign) { 1045 offset = virtio_pci_queue_mem_mult(proxy) * n; 1046 memory_region_add_subregion_overlap(&proxy->notify.mr, offset, mr, 1); 1047 } else { 1048 memory_region_del_subregion(&proxy->notify.mr, mr); 1049 } 1050 1051 return 0; 1052 } 1053 1054 static void virtio_pci_vmstate_change(DeviceState *d, bool running) 1055 { 1056 VirtIOPCIProxy *proxy = to_virtio_pci_proxy(d); 1057 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1058 1059 if (running) { 1060 /* Old QEMU versions did not set bus master enable on status write. 1061 * Detect DRIVER set and enable it. 1062 */ 1063 if ((proxy->flags & VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION) && 1064 (vdev->status & VIRTIO_CONFIG_S_DRIVER) && 1065 !(proxy->pci_dev.config[PCI_COMMAND] & PCI_COMMAND_MASTER)) { 1066 pci_default_write_config(&proxy->pci_dev, PCI_COMMAND, 1067 proxy->pci_dev.config[PCI_COMMAND] | 1068 PCI_COMMAND_MASTER, 1); 1069 } 1070 virtio_pci_start_ioeventfd(proxy); 1071 } else { 1072 virtio_pci_stop_ioeventfd(proxy); 1073 } 1074 } 1075 1076 /* 1077 * virtio-pci: This is the PCIDevice which has a virtio-pci-bus. 1078 */ 1079 1080 static int virtio_pci_query_nvectors(DeviceState *d) 1081 { 1082 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1083 1084 return proxy->nvectors; 1085 } 1086 1087 static AddressSpace *virtio_pci_get_dma_as(DeviceState *d) 1088 { 1089 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1090 PCIDevice *dev = &proxy->pci_dev; 1091 1092 return pci_get_address_space(dev); 1093 } 1094 1095 static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy, 1096 struct virtio_pci_cap *cap) 1097 { 1098 PCIDevice *dev = &proxy->pci_dev; 1099 int offset; 1100 1101 offset = pci_add_capability(dev, PCI_CAP_ID_VNDR, 0, 1102 cap->cap_len, &error_abort); 1103 1104 assert(cap->cap_len >= sizeof *cap); 1105 memcpy(dev->config + offset + PCI_CAP_FLAGS, &cap->cap_len, 1106 cap->cap_len - PCI_CAP_FLAGS); 1107 1108 return offset; 1109 } 1110 1111 static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr, 1112 unsigned size) 1113 { 1114 VirtIOPCIProxy *proxy = opaque; 1115 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1116 uint32_t val = 0; 1117 int i; 1118 1119 switch (addr) { 1120 case VIRTIO_PCI_COMMON_DFSELECT: 1121 val = proxy->dfselect; 1122 break; 1123 case VIRTIO_PCI_COMMON_DF: 1124 if (proxy->dfselect <= 1) { 1125 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 1126 1127 val = (vdev->host_features & ~vdc->legacy_features) >> 1128 (32 * proxy->dfselect); 1129 } 1130 break; 1131 case VIRTIO_PCI_COMMON_GFSELECT: 1132 val = proxy->gfselect; 1133 break; 1134 case VIRTIO_PCI_COMMON_GF: 1135 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) { 1136 val = proxy->guest_features[proxy->gfselect]; 1137 } 1138 break; 1139 case VIRTIO_PCI_COMMON_MSIX: 1140 val = vdev->config_vector; 1141 break; 1142 case VIRTIO_PCI_COMMON_NUMQ: 1143 for (i = 0; i < VIRTIO_QUEUE_MAX; ++i) { 1144 if (virtio_queue_get_num(vdev, i)) { 1145 val = i + 1; 1146 } 1147 } 1148 break; 1149 case VIRTIO_PCI_COMMON_STATUS: 1150 val = vdev->status; 1151 break; 1152 case VIRTIO_PCI_COMMON_CFGGENERATION: 1153 val = vdev->generation; 1154 break; 1155 case VIRTIO_PCI_COMMON_Q_SELECT: 1156 val = vdev->queue_sel; 1157 break; 1158 case VIRTIO_PCI_COMMON_Q_SIZE: 1159 val = virtio_queue_get_num(vdev, vdev->queue_sel); 1160 break; 1161 case VIRTIO_PCI_COMMON_Q_MSIX: 1162 val = virtio_queue_vector(vdev, vdev->queue_sel); 1163 break; 1164 case VIRTIO_PCI_COMMON_Q_ENABLE: 1165 val = proxy->vqs[vdev->queue_sel].enabled; 1166 break; 1167 case VIRTIO_PCI_COMMON_Q_NOFF: 1168 /* Simply map queues in order */ 1169 val = vdev->queue_sel; 1170 break; 1171 case VIRTIO_PCI_COMMON_Q_DESCLO: 1172 val = proxy->vqs[vdev->queue_sel].desc[0]; 1173 break; 1174 case VIRTIO_PCI_COMMON_Q_DESCHI: 1175 val = proxy->vqs[vdev->queue_sel].desc[1]; 1176 break; 1177 case VIRTIO_PCI_COMMON_Q_AVAILLO: 1178 val = proxy->vqs[vdev->queue_sel].avail[0]; 1179 break; 1180 case VIRTIO_PCI_COMMON_Q_AVAILHI: 1181 val = proxy->vqs[vdev->queue_sel].avail[1]; 1182 break; 1183 case VIRTIO_PCI_COMMON_Q_USEDLO: 1184 val = proxy->vqs[vdev->queue_sel].used[0]; 1185 break; 1186 case VIRTIO_PCI_COMMON_Q_USEDHI: 1187 val = proxy->vqs[vdev->queue_sel].used[1]; 1188 break; 1189 default: 1190 val = 0; 1191 } 1192 1193 return val; 1194 } 1195 1196 static void virtio_pci_common_write(void *opaque, hwaddr addr, 1197 uint64_t val, unsigned size) 1198 { 1199 VirtIOPCIProxy *proxy = opaque; 1200 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1201 1202 switch (addr) { 1203 case VIRTIO_PCI_COMMON_DFSELECT: 1204 proxy->dfselect = val; 1205 break; 1206 case VIRTIO_PCI_COMMON_GFSELECT: 1207 proxy->gfselect = val; 1208 break; 1209 case VIRTIO_PCI_COMMON_GF: 1210 if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) { 1211 proxy->guest_features[proxy->gfselect] = val; 1212 virtio_set_features(vdev, 1213 (((uint64_t)proxy->guest_features[1]) << 32) | 1214 proxy->guest_features[0]); 1215 } 1216 break; 1217 case VIRTIO_PCI_COMMON_MSIX: 1218 msix_vector_unuse(&proxy->pci_dev, vdev->config_vector); 1219 /* Make it possible for guest to discover an error took place. */ 1220 if (msix_vector_use(&proxy->pci_dev, val) < 0) { 1221 val = VIRTIO_NO_VECTOR; 1222 } 1223 vdev->config_vector = val; 1224 break; 1225 case VIRTIO_PCI_COMMON_STATUS: 1226 if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) { 1227 virtio_pci_stop_ioeventfd(proxy); 1228 } 1229 1230 virtio_set_status(vdev, val & 0xFF); 1231 1232 if (val & VIRTIO_CONFIG_S_DRIVER_OK) { 1233 virtio_pci_start_ioeventfd(proxy); 1234 } 1235 1236 if (vdev->status == 0) { 1237 virtio_pci_reset(DEVICE(proxy)); 1238 } 1239 1240 break; 1241 case VIRTIO_PCI_COMMON_Q_SELECT: 1242 if (val < VIRTIO_QUEUE_MAX) { 1243 vdev->queue_sel = val; 1244 } 1245 break; 1246 case VIRTIO_PCI_COMMON_Q_SIZE: 1247 proxy->vqs[vdev->queue_sel].num = val; 1248 break; 1249 case VIRTIO_PCI_COMMON_Q_MSIX: 1250 msix_vector_unuse(&proxy->pci_dev, 1251 virtio_queue_vector(vdev, vdev->queue_sel)); 1252 /* Make it possible for guest to discover an error took place. */ 1253 if (msix_vector_use(&proxy->pci_dev, val) < 0) { 1254 val = VIRTIO_NO_VECTOR; 1255 } 1256 virtio_queue_set_vector(vdev, vdev->queue_sel, val); 1257 break; 1258 case VIRTIO_PCI_COMMON_Q_ENABLE: 1259 virtio_queue_set_num(vdev, vdev->queue_sel, 1260 proxy->vqs[vdev->queue_sel].num); 1261 virtio_queue_set_rings(vdev, vdev->queue_sel, 1262 ((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 | 1263 proxy->vqs[vdev->queue_sel].desc[0], 1264 ((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 | 1265 proxy->vqs[vdev->queue_sel].avail[0], 1266 ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 | 1267 proxy->vqs[vdev->queue_sel].used[0]); 1268 proxy->vqs[vdev->queue_sel].enabled = 1; 1269 break; 1270 case VIRTIO_PCI_COMMON_Q_DESCLO: 1271 proxy->vqs[vdev->queue_sel].desc[0] = val; 1272 break; 1273 case VIRTIO_PCI_COMMON_Q_DESCHI: 1274 proxy->vqs[vdev->queue_sel].desc[1] = val; 1275 break; 1276 case VIRTIO_PCI_COMMON_Q_AVAILLO: 1277 proxy->vqs[vdev->queue_sel].avail[0] = val; 1278 break; 1279 case VIRTIO_PCI_COMMON_Q_AVAILHI: 1280 proxy->vqs[vdev->queue_sel].avail[1] = val; 1281 break; 1282 case VIRTIO_PCI_COMMON_Q_USEDLO: 1283 proxy->vqs[vdev->queue_sel].used[0] = val; 1284 break; 1285 case VIRTIO_PCI_COMMON_Q_USEDHI: 1286 proxy->vqs[vdev->queue_sel].used[1] = val; 1287 break; 1288 default: 1289 break; 1290 } 1291 } 1292 1293 1294 static uint64_t virtio_pci_notify_read(void *opaque, hwaddr addr, 1295 unsigned size) 1296 { 1297 return 0; 1298 } 1299 1300 static void virtio_pci_notify_write(void *opaque, hwaddr addr, 1301 uint64_t val, unsigned size) 1302 { 1303 VirtIODevice *vdev = opaque; 1304 VirtIOPCIProxy *proxy = VIRTIO_PCI(DEVICE(vdev)->parent_bus->parent); 1305 unsigned queue = addr / virtio_pci_queue_mem_mult(proxy); 1306 1307 if (queue < VIRTIO_QUEUE_MAX) { 1308 virtio_queue_notify(vdev, queue); 1309 } 1310 } 1311 1312 static void virtio_pci_notify_write_pio(void *opaque, hwaddr addr, 1313 uint64_t val, unsigned size) 1314 { 1315 VirtIODevice *vdev = opaque; 1316 unsigned queue = val; 1317 1318 if (queue < VIRTIO_QUEUE_MAX) { 1319 virtio_queue_notify(vdev, queue); 1320 } 1321 } 1322 1323 static uint64_t virtio_pci_isr_read(void *opaque, hwaddr addr, 1324 unsigned size) 1325 { 1326 VirtIOPCIProxy *proxy = opaque; 1327 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1328 uint64_t val = atomic_xchg(&vdev->isr, 0); 1329 pci_irq_deassert(&proxy->pci_dev); 1330 1331 return val; 1332 } 1333 1334 static void virtio_pci_isr_write(void *opaque, hwaddr addr, 1335 uint64_t val, unsigned size) 1336 { 1337 } 1338 1339 static uint64_t virtio_pci_device_read(void *opaque, hwaddr addr, 1340 unsigned size) 1341 { 1342 VirtIODevice *vdev = opaque; 1343 uint64_t val = 0; 1344 1345 switch (size) { 1346 case 1: 1347 val = virtio_config_modern_readb(vdev, addr); 1348 break; 1349 case 2: 1350 val = virtio_config_modern_readw(vdev, addr); 1351 break; 1352 case 4: 1353 val = virtio_config_modern_readl(vdev, addr); 1354 break; 1355 } 1356 return val; 1357 } 1358 1359 static void virtio_pci_device_write(void *opaque, hwaddr addr, 1360 uint64_t val, unsigned size) 1361 { 1362 VirtIODevice *vdev = opaque; 1363 switch (size) { 1364 case 1: 1365 virtio_config_modern_writeb(vdev, addr, val); 1366 break; 1367 case 2: 1368 virtio_config_modern_writew(vdev, addr, val); 1369 break; 1370 case 4: 1371 virtio_config_modern_writel(vdev, addr, val); 1372 break; 1373 } 1374 } 1375 1376 static void virtio_pci_modern_regions_init(VirtIOPCIProxy *proxy) 1377 { 1378 static const MemoryRegionOps common_ops = { 1379 .read = virtio_pci_common_read, 1380 .write = virtio_pci_common_write, 1381 .impl = { 1382 .min_access_size = 1, 1383 .max_access_size = 4, 1384 }, 1385 .endianness = DEVICE_LITTLE_ENDIAN, 1386 }; 1387 static const MemoryRegionOps isr_ops = { 1388 .read = virtio_pci_isr_read, 1389 .write = virtio_pci_isr_write, 1390 .impl = { 1391 .min_access_size = 1, 1392 .max_access_size = 4, 1393 }, 1394 .endianness = DEVICE_LITTLE_ENDIAN, 1395 }; 1396 static const MemoryRegionOps device_ops = { 1397 .read = virtio_pci_device_read, 1398 .write = virtio_pci_device_write, 1399 .impl = { 1400 .min_access_size = 1, 1401 .max_access_size = 4, 1402 }, 1403 .endianness = DEVICE_LITTLE_ENDIAN, 1404 }; 1405 static const MemoryRegionOps notify_ops = { 1406 .read = virtio_pci_notify_read, 1407 .write = virtio_pci_notify_write, 1408 .impl = { 1409 .min_access_size = 1, 1410 .max_access_size = 4, 1411 }, 1412 .endianness = DEVICE_LITTLE_ENDIAN, 1413 }; 1414 static const MemoryRegionOps notify_pio_ops = { 1415 .read = virtio_pci_notify_read, 1416 .write = virtio_pci_notify_write_pio, 1417 .impl = { 1418 .min_access_size = 1, 1419 .max_access_size = 4, 1420 }, 1421 .endianness = DEVICE_LITTLE_ENDIAN, 1422 }; 1423 1424 1425 memory_region_init_io(&proxy->common.mr, OBJECT(proxy), 1426 &common_ops, 1427 proxy, 1428 "virtio-pci-common", 1429 proxy->common.size); 1430 1431 memory_region_init_io(&proxy->isr.mr, OBJECT(proxy), 1432 &isr_ops, 1433 proxy, 1434 "virtio-pci-isr", 1435 proxy->isr.size); 1436 1437 memory_region_init_io(&proxy->device.mr, OBJECT(proxy), 1438 &device_ops, 1439 virtio_bus_get_device(&proxy->bus), 1440 "virtio-pci-device", 1441 proxy->device.size); 1442 1443 memory_region_init_io(&proxy->notify.mr, OBJECT(proxy), 1444 ¬ify_ops, 1445 virtio_bus_get_device(&proxy->bus), 1446 "virtio-pci-notify", 1447 proxy->notify.size); 1448 1449 memory_region_init_io(&proxy->notify_pio.mr, OBJECT(proxy), 1450 ¬ify_pio_ops, 1451 virtio_bus_get_device(&proxy->bus), 1452 "virtio-pci-notify-pio", 1453 proxy->notify_pio.size); 1454 } 1455 1456 static void virtio_pci_modern_region_map(VirtIOPCIProxy *proxy, 1457 VirtIOPCIRegion *region, 1458 struct virtio_pci_cap *cap, 1459 MemoryRegion *mr, 1460 uint8_t bar) 1461 { 1462 memory_region_add_subregion(mr, region->offset, ®ion->mr); 1463 1464 cap->cfg_type = region->type; 1465 cap->bar = bar; 1466 cap->offset = cpu_to_le32(region->offset); 1467 cap->length = cpu_to_le32(region->size); 1468 virtio_pci_add_mem_cap(proxy, cap); 1469 1470 } 1471 1472 static void virtio_pci_modern_mem_region_map(VirtIOPCIProxy *proxy, 1473 VirtIOPCIRegion *region, 1474 struct virtio_pci_cap *cap) 1475 { 1476 virtio_pci_modern_region_map(proxy, region, cap, 1477 &proxy->modern_bar, proxy->modern_mem_bar_idx); 1478 } 1479 1480 static void virtio_pci_modern_io_region_map(VirtIOPCIProxy *proxy, 1481 VirtIOPCIRegion *region, 1482 struct virtio_pci_cap *cap) 1483 { 1484 virtio_pci_modern_region_map(proxy, region, cap, 1485 &proxy->io_bar, proxy->modern_io_bar_idx); 1486 } 1487 1488 static void virtio_pci_modern_mem_region_unmap(VirtIOPCIProxy *proxy, 1489 VirtIOPCIRegion *region) 1490 { 1491 memory_region_del_subregion(&proxy->modern_bar, 1492 ®ion->mr); 1493 } 1494 1495 static void virtio_pci_modern_io_region_unmap(VirtIOPCIProxy *proxy, 1496 VirtIOPCIRegion *region) 1497 { 1498 memory_region_del_subregion(&proxy->io_bar, 1499 ®ion->mr); 1500 } 1501 1502 static void virtio_pci_pre_plugged(DeviceState *d, Error **errp) 1503 { 1504 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1505 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1506 1507 if (virtio_pci_modern(proxy)) { 1508 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 1509 } 1510 1511 virtio_add_feature(&vdev->host_features, VIRTIO_F_BAD_FEATURE); 1512 } 1513 1514 /* This is called by virtio-bus just after the device is plugged. */ 1515 static void virtio_pci_device_plugged(DeviceState *d, Error **errp) 1516 { 1517 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1518 VirtioBusState *bus = &proxy->bus; 1519 bool legacy = virtio_pci_legacy(proxy); 1520 bool modern; 1521 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 1522 uint8_t *config; 1523 uint32_t size; 1524 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 1525 1526 /* 1527 * Virtio capabilities present without 1528 * VIRTIO_F_VERSION_1 confuses guests 1529 */ 1530 if (!proxy->ignore_backend_features && 1531 !virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) { 1532 virtio_pci_disable_modern(proxy); 1533 1534 if (!legacy) { 1535 error_setg(errp, "Device doesn't support modern mode, and legacy" 1536 " mode is disabled"); 1537 error_append_hint(errp, "Set disable-legacy to off\n"); 1538 1539 return; 1540 } 1541 } 1542 1543 modern = virtio_pci_modern(proxy); 1544 1545 config = proxy->pci_dev.config; 1546 if (proxy->class_code) { 1547 pci_config_set_class(config, proxy->class_code); 1548 } 1549 1550 if (legacy) { 1551 if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) { 1552 error_setg(errp, "VIRTIO_F_IOMMU_PLATFORM was supported by" 1553 " neither legacy nor transitional device"); 1554 return ; 1555 } 1556 /* 1557 * Legacy and transitional devices use specific subsystem IDs. 1558 * Note that the subsystem vendor ID (config + PCI_SUBSYSTEM_VENDOR_ID) 1559 * is set to PCI_SUBVENDOR_ID_REDHAT_QUMRANET by default. 1560 */ 1561 pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_bus_get_vdev_id(bus)); 1562 } else { 1563 /* pure virtio-1.0 */ 1564 pci_set_word(config + PCI_VENDOR_ID, 1565 PCI_VENDOR_ID_REDHAT_QUMRANET); 1566 pci_set_word(config + PCI_DEVICE_ID, 1567 0x1040 + virtio_bus_get_vdev_id(bus)); 1568 pci_config_set_revision(config, 1); 1569 } 1570 config[PCI_INTERRUPT_PIN] = 1; 1571 1572 1573 if (modern) { 1574 struct virtio_pci_cap cap = { 1575 .cap_len = sizeof cap, 1576 }; 1577 struct virtio_pci_notify_cap notify = { 1578 .cap.cap_len = sizeof notify, 1579 .notify_off_multiplier = 1580 cpu_to_le32(virtio_pci_queue_mem_mult(proxy)), 1581 }; 1582 struct virtio_pci_cfg_cap cfg = { 1583 .cap.cap_len = sizeof cfg, 1584 .cap.cfg_type = VIRTIO_PCI_CAP_PCI_CFG, 1585 }; 1586 struct virtio_pci_notify_cap notify_pio = { 1587 .cap.cap_len = sizeof notify, 1588 .notify_off_multiplier = cpu_to_le32(0x0), 1589 }; 1590 1591 struct virtio_pci_cfg_cap *cfg_mask; 1592 1593 virtio_pci_modern_regions_init(proxy); 1594 1595 virtio_pci_modern_mem_region_map(proxy, &proxy->common, &cap); 1596 virtio_pci_modern_mem_region_map(proxy, &proxy->isr, &cap); 1597 virtio_pci_modern_mem_region_map(proxy, &proxy->device, &cap); 1598 virtio_pci_modern_mem_region_map(proxy, &proxy->notify, ¬ify.cap); 1599 1600 if (modern_pio) { 1601 memory_region_init(&proxy->io_bar, OBJECT(proxy), 1602 "virtio-pci-io", 0x4); 1603 1604 pci_register_bar(&proxy->pci_dev, proxy->modern_io_bar_idx, 1605 PCI_BASE_ADDRESS_SPACE_IO, &proxy->io_bar); 1606 1607 virtio_pci_modern_io_region_map(proxy, &proxy->notify_pio, 1608 ¬ify_pio.cap); 1609 } 1610 1611 pci_register_bar(&proxy->pci_dev, proxy->modern_mem_bar_idx, 1612 PCI_BASE_ADDRESS_SPACE_MEMORY | 1613 PCI_BASE_ADDRESS_MEM_PREFETCH | 1614 PCI_BASE_ADDRESS_MEM_TYPE_64, 1615 &proxy->modern_bar); 1616 1617 proxy->config_cap = virtio_pci_add_mem_cap(proxy, &cfg.cap); 1618 cfg_mask = (void *)(proxy->pci_dev.wmask + proxy->config_cap); 1619 pci_set_byte(&cfg_mask->cap.bar, ~0x0); 1620 pci_set_long((uint8_t *)&cfg_mask->cap.offset, ~0x0); 1621 pci_set_long((uint8_t *)&cfg_mask->cap.length, ~0x0); 1622 pci_set_long(cfg_mask->pci_cfg_data, ~0x0); 1623 } 1624 1625 if (proxy->nvectors) { 1626 int err = msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1627 proxy->msix_bar_idx, NULL); 1628 if (err) { 1629 /* Notice when a system that supports MSIx can't initialize it */ 1630 if (err != -ENOTSUP) { 1631 warn_report("unable to init msix vectors to %" PRIu32, 1632 proxy->nvectors); 1633 } 1634 proxy->nvectors = 0; 1635 } 1636 } 1637 1638 proxy->pci_dev.config_write = virtio_write_config; 1639 proxy->pci_dev.config_read = virtio_read_config; 1640 1641 if (legacy) { 1642 size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev) 1643 + virtio_bus_get_vdev_config_len(bus); 1644 size = pow2ceil(size); 1645 1646 memory_region_init_io(&proxy->bar, OBJECT(proxy), 1647 &virtio_pci_config_ops, 1648 proxy, "virtio-pci", size); 1649 1650 pci_register_bar(&proxy->pci_dev, proxy->legacy_io_bar_idx, 1651 PCI_BASE_ADDRESS_SPACE_IO, &proxy->bar); 1652 } 1653 } 1654 1655 static void virtio_pci_device_unplugged(DeviceState *d) 1656 { 1657 VirtIOPCIProxy *proxy = VIRTIO_PCI(d); 1658 bool modern = virtio_pci_modern(proxy); 1659 bool modern_pio = proxy->flags & VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY; 1660 1661 virtio_pci_stop_ioeventfd(proxy); 1662 1663 if (modern) { 1664 virtio_pci_modern_mem_region_unmap(proxy, &proxy->common); 1665 virtio_pci_modern_mem_region_unmap(proxy, &proxy->isr); 1666 virtio_pci_modern_mem_region_unmap(proxy, &proxy->device); 1667 virtio_pci_modern_mem_region_unmap(proxy, &proxy->notify); 1668 if (modern_pio) { 1669 virtio_pci_modern_io_region_unmap(proxy, &proxy->notify_pio); 1670 } 1671 } 1672 } 1673 1674 static void virtio_pci_realize(PCIDevice *pci_dev, Error **errp) 1675 { 1676 VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev); 1677 VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev); 1678 bool pcie_port = pci_bus_is_express(pci_get_bus(pci_dev)) && 1679 !pci_bus_is_root(pci_get_bus(pci_dev)); 1680 1681 if (kvm_enabled() && !kvm_has_many_ioeventfds()) { 1682 proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD; 1683 } 1684 1685 /* 1686 * virtio pci bar layout used by default. 1687 * subclasses can re-arrange things if needed. 1688 * 1689 * region 0 -- virtio legacy io bar 1690 * region 1 -- msi-x bar 1691 * region 4+5 -- virtio modern memory (64bit) bar 1692 * 1693 */ 1694 proxy->legacy_io_bar_idx = 0; 1695 proxy->msix_bar_idx = 1; 1696 proxy->modern_io_bar_idx = 2; 1697 proxy->modern_mem_bar_idx = 4; 1698 1699 proxy->common.offset = 0x0; 1700 proxy->common.size = 0x1000; 1701 proxy->common.type = VIRTIO_PCI_CAP_COMMON_CFG; 1702 1703 proxy->isr.offset = 0x1000; 1704 proxy->isr.size = 0x1000; 1705 proxy->isr.type = VIRTIO_PCI_CAP_ISR_CFG; 1706 1707 proxy->device.offset = 0x2000; 1708 proxy->device.size = 0x1000; 1709 proxy->device.type = VIRTIO_PCI_CAP_DEVICE_CFG; 1710 1711 proxy->notify.offset = 0x3000; 1712 proxy->notify.size = virtio_pci_queue_mem_mult(proxy) * VIRTIO_QUEUE_MAX; 1713 proxy->notify.type = VIRTIO_PCI_CAP_NOTIFY_CFG; 1714 1715 proxy->notify_pio.offset = 0x0; 1716 proxy->notify_pio.size = 0x4; 1717 proxy->notify_pio.type = VIRTIO_PCI_CAP_NOTIFY_CFG; 1718 1719 /* subclasses can enforce modern, so do this unconditionally */ 1720 memory_region_init(&proxy->modern_bar, OBJECT(proxy), "virtio-pci", 1721 /* PCI BAR regions must be powers of 2 */ 1722 pow2ceil(proxy->notify.offset + proxy->notify.size)); 1723 1724 if (proxy->disable_legacy == ON_OFF_AUTO_AUTO) { 1725 proxy->disable_legacy = pcie_port ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF; 1726 } 1727 1728 if (!virtio_pci_modern(proxy) && !virtio_pci_legacy(proxy)) { 1729 error_setg(errp, "device cannot work as neither modern nor legacy mode" 1730 " is enabled"); 1731 error_append_hint(errp, "Set either disable-modern or disable-legacy" 1732 " to off\n"); 1733 return; 1734 } 1735 1736 if (pcie_port && pci_is_express(pci_dev)) { 1737 int pos; 1738 1739 pos = pcie_endpoint_cap_init(pci_dev, 0); 1740 assert(pos > 0); 1741 1742 pos = pci_add_capability(pci_dev, PCI_CAP_ID_PM, 0, 1743 PCI_PM_SIZEOF, errp); 1744 if (pos < 0) { 1745 return; 1746 } 1747 1748 pci_dev->exp.pm_cap = pos; 1749 1750 /* 1751 * Indicates that this function complies with revision 1.2 of the 1752 * PCI Power Management Interface Specification. 1753 */ 1754 pci_set_word(pci_dev->config + pos + PCI_PM_PMC, 0x3); 1755 1756 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_DEVERR) { 1757 /* Init error enabling flags */ 1758 pcie_cap_deverr_init(pci_dev); 1759 } 1760 1761 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_LNKCTL) { 1762 /* Init Link Control Register */ 1763 pcie_cap_lnkctl_init(pci_dev); 1764 } 1765 1766 if (proxy->flags & VIRTIO_PCI_FLAG_INIT_PM) { 1767 /* Init Power Management Control Register */ 1768 pci_set_word(pci_dev->wmask + pos + PCI_PM_CTRL, 1769 PCI_PM_CTRL_STATE_MASK); 1770 } 1771 1772 if (proxy->flags & VIRTIO_PCI_FLAG_ATS) { 1773 pcie_ats_init(pci_dev, 256); 1774 } 1775 1776 } else { 1777 /* 1778 * make future invocations of pci_is_express() return false 1779 * and pci_config_size() return PCI_CONFIG_SPACE_SIZE. 1780 */ 1781 pci_dev->cap_present &= ~QEMU_PCI_CAP_EXPRESS; 1782 } 1783 1784 virtio_pci_bus_new(&proxy->bus, sizeof(proxy->bus), proxy); 1785 if (k->realize) { 1786 k->realize(proxy, errp); 1787 } 1788 } 1789 1790 static void virtio_pci_exit(PCIDevice *pci_dev) 1791 { 1792 msix_uninit_exclusive_bar(pci_dev); 1793 } 1794 1795 static void virtio_pci_reset(DeviceState *qdev) 1796 { 1797 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev); 1798 VirtioBusState *bus = VIRTIO_BUS(&proxy->bus); 1799 PCIDevice *dev = PCI_DEVICE(qdev); 1800 int i; 1801 1802 virtio_pci_stop_ioeventfd(proxy); 1803 virtio_bus_reset(bus); 1804 msix_unuse_all_vectors(&proxy->pci_dev); 1805 1806 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { 1807 proxy->vqs[i].enabled = 0; 1808 proxy->vqs[i].num = 0; 1809 proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0; 1810 proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0; 1811 proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0; 1812 } 1813 1814 if (pci_is_express(dev)) { 1815 pcie_cap_deverr_reset(dev); 1816 pcie_cap_lnkctl_reset(dev); 1817 1818 pci_set_word(dev->config + dev->exp.pm_cap + PCI_PM_CTRL, 0); 1819 } 1820 } 1821 1822 static Property virtio_pci_properties[] = { 1823 DEFINE_PROP_BIT("virtio-pci-bus-master-bug-migration", VirtIOPCIProxy, flags, 1824 VIRTIO_PCI_FLAG_BUS_MASTER_BUG_MIGRATION_BIT, false), 1825 DEFINE_PROP_BIT("migrate-extra", VirtIOPCIProxy, flags, 1826 VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT, true), 1827 DEFINE_PROP_BIT("modern-pio-notify", VirtIOPCIProxy, flags, 1828 VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT, false), 1829 DEFINE_PROP_BIT("x-disable-pcie", VirtIOPCIProxy, flags, 1830 VIRTIO_PCI_FLAG_DISABLE_PCIE_BIT, false), 1831 DEFINE_PROP_BIT("page-per-vq", VirtIOPCIProxy, flags, 1832 VIRTIO_PCI_FLAG_PAGE_PER_VQ_BIT, false), 1833 DEFINE_PROP_BOOL("x-ignore-backend-features", VirtIOPCIProxy, 1834 ignore_backend_features, false), 1835 DEFINE_PROP_BIT("ats", VirtIOPCIProxy, flags, 1836 VIRTIO_PCI_FLAG_ATS_BIT, false), 1837 DEFINE_PROP_BIT("x-pcie-deverr-init", VirtIOPCIProxy, flags, 1838 VIRTIO_PCI_FLAG_INIT_DEVERR_BIT, true), 1839 DEFINE_PROP_BIT("x-pcie-lnkctl-init", VirtIOPCIProxy, flags, 1840 VIRTIO_PCI_FLAG_INIT_LNKCTL_BIT, true), 1841 DEFINE_PROP_BIT("x-pcie-pm-init", VirtIOPCIProxy, flags, 1842 VIRTIO_PCI_FLAG_INIT_PM_BIT, true), 1843 DEFINE_PROP_END_OF_LIST(), 1844 }; 1845 1846 static void virtio_pci_dc_realize(DeviceState *qdev, Error **errp) 1847 { 1848 VirtioPCIClass *vpciklass = VIRTIO_PCI_GET_CLASS(qdev); 1849 VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev); 1850 PCIDevice *pci_dev = &proxy->pci_dev; 1851 1852 if (!(proxy->flags & VIRTIO_PCI_FLAG_DISABLE_PCIE) && 1853 virtio_pci_modern(proxy)) { 1854 pci_dev->cap_present |= QEMU_PCI_CAP_EXPRESS; 1855 } 1856 1857 vpciklass->parent_dc_realize(qdev, errp); 1858 } 1859 1860 static void virtio_pci_class_init(ObjectClass *klass, void *data) 1861 { 1862 DeviceClass *dc = DEVICE_CLASS(klass); 1863 PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); 1864 VirtioPCIClass *vpciklass = VIRTIO_PCI_CLASS(klass); 1865 1866 dc->props = virtio_pci_properties; 1867 k->realize = virtio_pci_realize; 1868 k->exit = virtio_pci_exit; 1869 k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; 1870 k->revision = VIRTIO_PCI_ABI_VERSION; 1871 k->class_id = PCI_CLASS_OTHERS; 1872 device_class_set_parent_realize(dc, virtio_pci_dc_realize, 1873 &vpciklass->parent_dc_realize); 1874 dc->reset = virtio_pci_reset; 1875 } 1876 1877 static const TypeInfo virtio_pci_info = { 1878 .name = TYPE_VIRTIO_PCI, 1879 .parent = TYPE_PCI_DEVICE, 1880 .instance_size = sizeof(VirtIOPCIProxy), 1881 .class_init = virtio_pci_class_init, 1882 .class_size = sizeof(VirtioPCIClass), 1883 .abstract = true, 1884 }; 1885 1886 static Property virtio_pci_generic_properties[] = { 1887 DEFINE_PROP_ON_OFF_AUTO("disable-legacy", VirtIOPCIProxy, disable_legacy, 1888 ON_OFF_AUTO_AUTO), 1889 DEFINE_PROP_BOOL("disable-modern", VirtIOPCIProxy, disable_modern, false), 1890 DEFINE_PROP_END_OF_LIST(), 1891 }; 1892 1893 static void virtio_pci_base_class_init(ObjectClass *klass, void *data) 1894 { 1895 const VirtioPCIDeviceTypeInfo *t = data; 1896 if (t->class_init) { 1897 t->class_init(klass, NULL); 1898 } 1899 } 1900 1901 static void virtio_pci_generic_class_init(ObjectClass *klass, void *data) 1902 { 1903 DeviceClass *dc = DEVICE_CLASS(klass); 1904 1905 dc->props = virtio_pci_generic_properties; 1906 } 1907 1908 /* Used when the generic type and the base type is the same */ 1909 static void virtio_pci_generic_base_class_init(ObjectClass *klass, void *data) 1910 { 1911 virtio_pci_base_class_init(klass, data); 1912 virtio_pci_generic_class_init(klass, NULL); 1913 } 1914 1915 static void virtio_pci_transitional_instance_init(Object *obj) 1916 { 1917 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj); 1918 1919 proxy->disable_legacy = ON_OFF_AUTO_OFF; 1920 proxy->disable_modern = false; 1921 } 1922 1923 static void virtio_pci_non_transitional_instance_init(Object *obj) 1924 { 1925 VirtIOPCIProxy *proxy = VIRTIO_PCI(obj); 1926 1927 proxy->disable_legacy = ON_OFF_AUTO_ON; 1928 proxy->disable_modern = false; 1929 } 1930 1931 void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t) 1932 { 1933 TypeInfo base_type_info = { 1934 .name = t->base_name, 1935 .parent = t->parent ? t->parent : TYPE_VIRTIO_PCI, 1936 .instance_size = t->instance_size, 1937 .instance_init = t->instance_init, 1938 .class_init = virtio_pci_base_class_init, 1939 .class_data = (void *)t, 1940 .abstract = true, 1941 }; 1942 TypeInfo generic_type_info = { 1943 .name = t->generic_name, 1944 .parent = base_type_info.name, 1945 .class_init = virtio_pci_generic_class_init, 1946 .interfaces = (InterfaceInfo[]) { 1947 { INTERFACE_PCIE_DEVICE }, 1948 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 1949 { } 1950 }, 1951 }; 1952 1953 if (!base_type_info.name) { 1954 /* No base type -> register a single generic device type */ 1955 base_type_info.name = t->generic_name; 1956 base_type_info.class_init = virtio_pci_generic_base_class_init; 1957 base_type_info.interfaces = generic_type_info.interfaces; 1958 base_type_info.abstract = false; 1959 generic_type_info.name = NULL; 1960 assert(!t->non_transitional_name); 1961 assert(!t->transitional_name); 1962 } 1963 1964 type_register(&base_type_info); 1965 if (generic_type_info.name) { 1966 type_register(&generic_type_info); 1967 } 1968 1969 if (t->non_transitional_name) { 1970 const TypeInfo non_transitional_type_info = { 1971 .name = t->non_transitional_name, 1972 .parent = base_type_info.name, 1973 .instance_init = virtio_pci_non_transitional_instance_init, 1974 .interfaces = (InterfaceInfo[]) { 1975 { INTERFACE_PCIE_DEVICE }, 1976 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 1977 { } 1978 }, 1979 }; 1980 type_register(&non_transitional_type_info); 1981 } 1982 1983 if (t->transitional_name) { 1984 const TypeInfo transitional_type_info = { 1985 .name = t->transitional_name, 1986 .parent = base_type_info.name, 1987 .instance_init = virtio_pci_transitional_instance_init, 1988 .interfaces = (InterfaceInfo[]) { 1989 /* 1990 * Transitional virtio devices work only as Conventional PCI 1991 * devices because they require PIO ports. 1992 */ 1993 { INTERFACE_CONVENTIONAL_PCI_DEVICE }, 1994 { } 1995 }, 1996 }; 1997 type_register(&transitional_type_info); 1998 } 1999 } 2000 2001 /* virtio-pci-bus */ 2002 2003 static void virtio_pci_bus_new(VirtioBusState *bus, size_t bus_size, 2004 VirtIOPCIProxy *dev) 2005 { 2006 DeviceState *qdev = DEVICE(dev); 2007 char virtio_bus_name[] = "virtio-bus"; 2008 2009 qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_PCI_BUS, qdev, 2010 virtio_bus_name); 2011 } 2012 2013 static void virtio_pci_bus_class_init(ObjectClass *klass, void *data) 2014 { 2015 BusClass *bus_class = BUS_CLASS(klass); 2016 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 2017 bus_class->max_dev = 1; 2018 k->notify = virtio_pci_notify; 2019 k->save_config = virtio_pci_save_config; 2020 k->load_config = virtio_pci_load_config; 2021 k->save_queue = virtio_pci_save_queue; 2022 k->load_queue = virtio_pci_load_queue; 2023 k->save_extra_state = virtio_pci_save_extra_state; 2024 k->load_extra_state = virtio_pci_load_extra_state; 2025 k->has_extra_state = virtio_pci_has_extra_state; 2026 k->query_guest_notifiers = virtio_pci_query_guest_notifiers; 2027 k->set_guest_notifiers = virtio_pci_set_guest_notifiers; 2028 k->set_host_notifier_mr = virtio_pci_set_host_notifier_mr; 2029 k->vmstate_change = virtio_pci_vmstate_change; 2030 k->pre_plugged = virtio_pci_pre_plugged; 2031 k->device_plugged = virtio_pci_device_plugged; 2032 k->device_unplugged = virtio_pci_device_unplugged; 2033 k->query_nvectors = virtio_pci_query_nvectors; 2034 k->ioeventfd_enabled = virtio_pci_ioeventfd_enabled; 2035 k->ioeventfd_assign = virtio_pci_ioeventfd_assign; 2036 k->get_dma_as = virtio_pci_get_dma_as; 2037 } 2038 2039 static const TypeInfo virtio_pci_bus_info = { 2040 .name = TYPE_VIRTIO_PCI_BUS, 2041 .parent = TYPE_VIRTIO_BUS, 2042 .instance_size = sizeof(VirtioPCIBusState), 2043 .class_init = virtio_pci_bus_class_init, 2044 }; 2045 2046 static void virtio_pci_register_types(void) 2047 { 2048 /* Base types: */ 2049 type_register_static(&virtio_pci_bus_info); 2050 type_register_static(&virtio_pci_info); 2051 } 2052 2053 type_init(virtio_pci_register_types) 2054 2055