1 /* 2 * Virtio MMIO bindings 3 * 4 * Copyright (c) 2011 Linaro Limited 5 * 6 * Author: 7 * Peter Maydell <peter.maydell@linaro.org> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License; either version 2 11 * of the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include "qemu/osdep.h" 23 #include "standard-headers/linux/virtio_mmio.h" 24 #include "hw/irq.h" 25 #include "hw/qdev-properties.h" 26 #include "hw/sysbus.h" 27 #include "hw/virtio/virtio.h" 28 #include "migration/qemu-file-types.h" 29 #include "qemu/host-utils.h" 30 #include "qemu/module.h" 31 #include "sysemu/kvm.h" 32 #include "sysemu/replay.h" 33 #include "hw/virtio/virtio-mmio.h" 34 #include "qemu/error-report.h" 35 #include "qemu/log.h" 36 #include "trace.h" 37 38 static bool virtio_mmio_ioeventfd_enabled(DeviceState *d) 39 { 40 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 41 42 return (proxy->flags & VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD) != 0; 43 } 44 45 static int virtio_mmio_ioeventfd_assign(DeviceState *d, 46 EventNotifier *notifier, 47 int n, bool assign) 48 { 49 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 50 51 if (assign) { 52 memory_region_add_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUE_NOTIFY, 4, 53 true, n, notifier); 54 } else { 55 memory_region_del_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUE_NOTIFY, 4, 56 true, n, notifier); 57 } 58 return 0; 59 } 60 61 static void virtio_mmio_start_ioeventfd(VirtIOMMIOProxy *proxy) 62 { 63 virtio_bus_start_ioeventfd(&proxy->bus); 64 } 65 66 static void virtio_mmio_stop_ioeventfd(VirtIOMMIOProxy *proxy) 67 { 68 virtio_bus_stop_ioeventfd(&proxy->bus); 69 } 70 71 static void virtio_mmio_soft_reset(VirtIOMMIOProxy *proxy) 72 { 73 int i; 74 75 virtio_bus_reset(&proxy->bus); 76 77 if (!proxy->legacy) { 78 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { 79 proxy->vqs[i].enabled = 0; 80 } 81 } 82 } 83 84 static uint64_t virtio_mmio_read(void *opaque, hwaddr offset, unsigned size) 85 { 86 VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque; 87 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 88 89 trace_virtio_mmio_read(offset); 90 91 if (!vdev) { 92 /* If no backend is present, we treat most registers as 93 * read-as-zero, except for the magic number, version and 94 * vendor ID. This is not strictly sanctioned by the virtio 95 * spec, but it allows us to provide transports with no backend 96 * plugged in which don't confuse Linux's virtio code: the 97 * probe won't complain about the bad magic number, but the 98 * device ID of zero means no backend will claim it. 99 */ 100 switch (offset) { 101 case VIRTIO_MMIO_MAGIC_VALUE: 102 return VIRT_MAGIC; 103 case VIRTIO_MMIO_VERSION: 104 if (proxy->legacy) { 105 return VIRT_VERSION_LEGACY; 106 } else { 107 return VIRT_VERSION; 108 } 109 case VIRTIO_MMIO_VENDOR_ID: 110 return VIRT_VENDOR; 111 default: 112 return 0; 113 } 114 } 115 116 if (offset >= VIRTIO_MMIO_CONFIG) { 117 offset -= VIRTIO_MMIO_CONFIG; 118 if (proxy->legacy) { 119 switch (size) { 120 case 1: 121 return virtio_config_readb(vdev, offset); 122 case 2: 123 return virtio_config_readw(vdev, offset); 124 case 4: 125 return virtio_config_readl(vdev, offset); 126 default: 127 abort(); 128 } 129 } else { 130 switch (size) { 131 case 1: 132 return virtio_config_modern_readb(vdev, offset); 133 case 2: 134 return virtio_config_modern_readw(vdev, offset); 135 case 4: 136 return virtio_config_modern_readl(vdev, offset); 137 default: 138 abort(); 139 } 140 } 141 } 142 if (size != 4) { 143 qemu_log_mask(LOG_GUEST_ERROR, 144 "%s: wrong size access to register!\n", 145 __func__); 146 return 0; 147 } 148 switch (offset) { 149 case VIRTIO_MMIO_MAGIC_VALUE: 150 return VIRT_MAGIC; 151 case VIRTIO_MMIO_VERSION: 152 if (proxy->legacy) { 153 return VIRT_VERSION_LEGACY; 154 } else { 155 return VIRT_VERSION; 156 } 157 case VIRTIO_MMIO_DEVICE_ID: 158 return vdev->device_id; 159 case VIRTIO_MMIO_VENDOR_ID: 160 return VIRT_VENDOR; 161 case VIRTIO_MMIO_DEVICE_FEATURES: 162 if (proxy->legacy) { 163 if (proxy->host_features_sel) { 164 return 0; 165 } else { 166 return vdev->host_features; 167 } 168 } else { 169 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 170 return (vdev->host_features & ~vdc->legacy_features) 171 >> (32 * proxy->host_features_sel); 172 } 173 case VIRTIO_MMIO_QUEUE_NUM_MAX: 174 if (!virtio_queue_get_num(vdev, vdev->queue_sel)) { 175 return 0; 176 } 177 return VIRTQUEUE_MAX_SIZE; 178 case VIRTIO_MMIO_QUEUE_PFN: 179 if (!proxy->legacy) { 180 qemu_log_mask(LOG_GUEST_ERROR, 181 "%s: read from legacy register (0x%" 182 HWADDR_PRIx ") in non-legacy mode\n", 183 __func__, offset); 184 return 0; 185 } 186 return virtio_queue_get_addr(vdev, vdev->queue_sel) 187 >> proxy->guest_page_shift; 188 case VIRTIO_MMIO_QUEUE_READY: 189 if (proxy->legacy) { 190 qemu_log_mask(LOG_GUEST_ERROR, 191 "%s: read from non-legacy register (0x%" 192 HWADDR_PRIx ") in legacy mode\n", 193 __func__, offset); 194 return 0; 195 } 196 return proxy->vqs[vdev->queue_sel].enabled; 197 case VIRTIO_MMIO_INTERRUPT_STATUS: 198 return qatomic_read(&vdev->isr); 199 case VIRTIO_MMIO_STATUS: 200 return vdev->status; 201 case VIRTIO_MMIO_CONFIG_GENERATION: 202 if (proxy->legacy) { 203 qemu_log_mask(LOG_GUEST_ERROR, 204 "%s: read from non-legacy register (0x%" 205 HWADDR_PRIx ") in legacy mode\n", 206 __func__, offset); 207 return 0; 208 } 209 return vdev->generation; 210 case VIRTIO_MMIO_SHM_LEN_LOW: 211 case VIRTIO_MMIO_SHM_LEN_HIGH: 212 /* 213 * VIRTIO_MMIO_SHM_SEL is unimplemented 214 * according to the linux driver, if region length is -1 215 * the shared memory doesn't exist 216 */ 217 return -1; 218 case VIRTIO_MMIO_DEVICE_FEATURES_SEL: 219 case VIRTIO_MMIO_DRIVER_FEATURES: 220 case VIRTIO_MMIO_DRIVER_FEATURES_SEL: 221 case VIRTIO_MMIO_GUEST_PAGE_SIZE: 222 case VIRTIO_MMIO_QUEUE_SEL: 223 case VIRTIO_MMIO_QUEUE_NUM: 224 case VIRTIO_MMIO_QUEUE_ALIGN: 225 case VIRTIO_MMIO_QUEUE_NOTIFY: 226 case VIRTIO_MMIO_INTERRUPT_ACK: 227 case VIRTIO_MMIO_QUEUE_DESC_LOW: 228 case VIRTIO_MMIO_QUEUE_DESC_HIGH: 229 case VIRTIO_MMIO_QUEUE_AVAIL_LOW: 230 case VIRTIO_MMIO_QUEUE_AVAIL_HIGH: 231 case VIRTIO_MMIO_QUEUE_USED_LOW: 232 case VIRTIO_MMIO_QUEUE_USED_HIGH: 233 qemu_log_mask(LOG_GUEST_ERROR, 234 "%s: read of write-only register (0x%" HWADDR_PRIx ")\n", 235 __func__, offset); 236 return 0; 237 default: 238 qemu_log_mask(LOG_GUEST_ERROR, 239 "%s: bad register offset (0x%" HWADDR_PRIx ")\n", 240 __func__, offset); 241 return 0; 242 } 243 return 0; 244 } 245 246 static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value, 247 unsigned size) 248 { 249 VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque; 250 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 251 252 trace_virtio_mmio_write_offset(offset, value); 253 254 if (!vdev) { 255 /* If no backend is present, we just make all registers 256 * write-ignored. This allows us to provide transports with 257 * no backend plugged in. 258 */ 259 return; 260 } 261 262 if (offset >= VIRTIO_MMIO_CONFIG) { 263 offset -= VIRTIO_MMIO_CONFIG; 264 if (proxy->legacy) { 265 switch (size) { 266 case 1: 267 virtio_config_writeb(vdev, offset, value); 268 break; 269 case 2: 270 virtio_config_writew(vdev, offset, value); 271 break; 272 case 4: 273 virtio_config_writel(vdev, offset, value); 274 break; 275 default: 276 abort(); 277 } 278 return; 279 } else { 280 switch (size) { 281 case 1: 282 virtio_config_modern_writeb(vdev, offset, value); 283 break; 284 case 2: 285 virtio_config_modern_writew(vdev, offset, value); 286 break; 287 case 4: 288 virtio_config_modern_writel(vdev, offset, value); 289 break; 290 default: 291 abort(); 292 } 293 return; 294 } 295 } 296 if (size != 4) { 297 qemu_log_mask(LOG_GUEST_ERROR, 298 "%s: wrong size access to register!\n", 299 __func__); 300 return; 301 } 302 switch (offset) { 303 case VIRTIO_MMIO_DEVICE_FEATURES_SEL: 304 if (value) { 305 proxy->host_features_sel = 1; 306 } else { 307 proxy->host_features_sel = 0; 308 } 309 break; 310 case VIRTIO_MMIO_DRIVER_FEATURES: 311 if (proxy->legacy) { 312 if (proxy->guest_features_sel) { 313 qemu_log_mask(LOG_GUEST_ERROR, 314 "%s: attempt to write guest features with " 315 "guest_features_sel > 0 in legacy mode\n", 316 __func__); 317 } else { 318 virtio_set_features(vdev, value); 319 } 320 } else { 321 proxy->guest_features[proxy->guest_features_sel] = value; 322 } 323 break; 324 case VIRTIO_MMIO_DRIVER_FEATURES_SEL: 325 if (value) { 326 proxy->guest_features_sel = 1; 327 } else { 328 proxy->guest_features_sel = 0; 329 } 330 break; 331 case VIRTIO_MMIO_GUEST_PAGE_SIZE: 332 if (!proxy->legacy) { 333 qemu_log_mask(LOG_GUEST_ERROR, 334 "%s: write to legacy register (0x%" 335 HWADDR_PRIx ") in non-legacy mode\n", 336 __func__, offset); 337 return; 338 } 339 proxy->guest_page_shift = ctz32(value); 340 if (proxy->guest_page_shift > 31) { 341 proxy->guest_page_shift = 0; 342 } 343 trace_virtio_mmio_guest_page(value, proxy->guest_page_shift); 344 break; 345 case VIRTIO_MMIO_QUEUE_SEL: 346 if (value < VIRTIO_QUEUE_MAX) { 347 vdev->queue_sel = value; 348 } 349 break; 350 case VIRTIO_MMIO_QUEUE_NUM: 351 trace_virtio_mmio_queue_write(value, VIRTQUEUE_MAX_SIZE); 352 virtio_queue_set_num(vdev, vdev->queue_sel, value); 353 354 if (proxy->legacy) { 355 virtio_queue_update_rings(vdev, vdev->queue_sel); 356 } else { 357 virtio_init_region_cache(vdev, vdev->queue_sel); 358 proxy->vqs[vdev->queue_sel].num = value; 359 } 360 break; 361 case VIRTIO_MMIO_QUEUE_ALIGN: 362 if (!proxy->legacy) { 363 qemu_log_mask(LOG_GUEST_ERROR, 364 "%s: write to legacy register (0x%" 365 HWADDR_PRIx ") in non-legacy mode\n", 366 __func__, offset); 367 return; 368 } 369 virtio_queue_set_align(vdev, vdev->queue_sel, value); 370 break; 371 case VIRTIO_MMIO_QUEUE_PFN: 372 if (!proxy->legacy) { 373 qemu_log_mask(LOG_GUEST_ERROR, 374 "%s: write to legacy register (0x%" 375 HWADDR_PRIx ") in non-legacy mode\n", 376 __func__, offset); 377 return; 378 } 379 if (value == 0) { 380 virtio_mmio_soft_reset(proxy); 381 } else { 382 virtio_queue_set_addr(vdev, vdev->queue_sel, 383 value << proxy->guest_page_shift); 384 } 385 break; 386 case VIRTIO_MMIO_QUEUE_READY: 387 if (proxy->legacy) { 388 qemu_log_mask(LOG_GUEST_ERROR, 389 "%s: write to non-legacy register (0x%" 390 HWADDR_PRIx ") in legacy mode\n", 391 __func__, offset); 392 return; 393 } 394 if (value) { 395 virtio_queue_set_num(vdev, vdev->queue_sel, 396 proxy->vqs[vdev->queue_sel].num); 397 virtio_queue_set_rings(vdev, vdev->queue_sel, 398 ((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 | 399 proxy->vqs[vdev->queue_sel].desc[0], 400 ((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 | 401 proxy->vqs[vdev->queue_sel].avail[0], 402 ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 | 403 proxy->vqs[vdev->queue_sel].used[0]); 404 proxy->vqs[vdev->queue_sel].enabled = 1; 405 } else { 406 proxy->vqs[vdev->queue_sel].enabled = 0; 407 } 408 break; 409 case VIRTIO_MMIO_QUEUE_NOTIFY: 410 if (value < VIRTIO_QUEUE_MAX) { 411 virtio_queue_notify(vdev, value); 412 } 413 break; 414 case VIRTIO_MMIO_INTERRUPT_ACK: 415 qatomic_and(&vdev->isr, ~value); 416 virtio_update_irq(vdev); 417 break; 418 case VIRTIO_MMIO_STATUS: 419 if (!(value & VIRTIO_CONFIG_S_DRIVER_OK)) { 420 virtio_mmio_stop_ioeventfd(proxy); 421 } 422 423 if (!proxy->legacy && (value & VIRTIO_CONFIG_S_FEATURES_OK)) { 424 virtio_set_features(vdev, 425 ((uint64_t)proxy->guest_features[1]) << 32 | 426 proxy->guest_features[0]); 427 } 428 429 virtio_set_status(vdev, value & 0xff); 430 431 if (value & VIRTIO_CONFIG_S_DRIVER_OK) { 432 virtio_mmio_start_ioeventfd(proxy); 433 } 434 435 if (vdev->status == 0) { 436 virtio_mmio_soft_reset(proxy); 437 } 438 break; 439 case VIRTIO_MMIO_QUEUE_DESC_LOW: 440 if (proxy->legacy) { 441 qemu_log_mask(LOG_GUEST_ERROR, 442 "%s: write to non-legacy register (0x%" 443 HWADDR_PRIx ") in legacy mode\n", 444 __func__, offset); 445 return; 446 } 447 proxy->vqs[vdev->queue_sel].desc[0] = value; 448 break; 449 case VIRTIO_MMIO_QUEUE_DESC_HIGH: 450 if (proxy->legacy) { 451 qemu_log_mask(LOG_GUEST_ERROR, 452 "%s: write to non-legacy register (0x%" 453 HWADDR_PRIx ") in legacy mode\n", 454 __func__, offset); 455 return; 456 } 457 proxy->vqs[vdev->queue_sel].desc[1] = value; 458 break; 459 case VIRTIO_MMIO_QUEUE_AVAIL_LOW: 460 if (proxy->legacy) { 461 qemu_log_mask(LOG_GUEST_ERROR, 462 "%s: write to non-legacy register (0x%" 463 HWADDR_PRIx ") in legacy mode\n", 464 __func__, offset); 465 return; 466 } 467 proxy->vqs[vdev->queue_sel].avail[0] = value; 468 break; 469 case VIRTIO_MMIO_QUEUE_AVAIL_HIGH: 470 if (proxy->legacy) { 471 qemu_log_mask(LOG_GUEST_ERROR, 472 "%s: write to non-legacy register (0x%" 473 HWADDR_PRIx ") in legacy mode\n", 474 __func__, offset); 475 return; 476 } 477 proxy->vqs[vdev->queue_sel].avail[1] = value; 478 break; 479 case VIRTIO_MMIO_QUEUE_USED_LOW: 480 if (proxy->legacy) { 481 qemu_log_mask(LOG_GUEST_ERROR, 482 "%s: write to non-legacy register (0x%" 483 HWADDR_PRIx ") in legacy mode\n", 484 __func__, offset); 485 return; 486 } 487 proxy->vqs[vdev->queue_sel].used[0] = value; 488 break; 489 case VIRTIO_MMIO_QUEUE_USED_HIGH: 490 if (proxy->legacy) { 491 qemu_log_mask(LOG_GUEST_ERROR, 492 "%s: write to non-legacy register (0x%" 493 HWADDR_PRIx ") in legacy mode\n", 494 __func__, offset); 495 return; 496 } 497 proxy->vqs[vdev->queue_sel].used[1] = value; 498 break; 499 case VIRTIO_MMIO_MAGIC_VALUE: 500 case VIRTIO_MMIO_VERSION: 501 case VIRTIO_MMIO_DEVICE_ID: 502 case VIRTIO_MMIO_VENDOR_ID: 503 case VIRTIO_MMIO_DEVICE_FEATURES: 504 case VIRTIO_MMIO_QUEUE_NUM_MAX: 505 case VIRTIO_MMIO_INTERRUPT_STATUS: 506 case VIRTIO_MMIO_CONFIG_GENERATION: 507 qemu_log_mask(LOG_GUEST_ERROR, 508 "%s: write to read-only register (0x%" HWADDR_PRIx ")\n", 509 __func__, offset); 510 break; 511 512 default: 513 qemu_log_mask(LOG_GUEST_ERROR, 514 "%s: bad register offset (0x%" HWADDR_PRIx ")\n", 515 __func__, offset); 516 } 517 } 518 519 static const MemoryRegionOps virtio_legacy_mem_ops = { 520 .read = virtio_mmio_read, 521 .write = virtio_mmio_write, 522 .endianness = DEVICE_NATIVE_ENDIAN, 523 }; 524 525 static const MemoryRegionOps virtio_mem_ops = { 526 .read = virtio_mmio_read, 527 .write = virtio_mmio_write, 528 .endianness = DEVICE_LITTLE_ENDIAN, 529 }; 530 531 static void virtio_mmio_update_irq(DeviceState *opaque, uint16_t vector) 532 { 533 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 534 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 535 int level; 536 537 if (!vdev) { 538 return; 539 } 540 level = (qatomic_read(&vdev->isr) != 0); 541 trace_virtio_mmio_setting_irq(level); 542 qemu_set_irq(proxy->irq, level); 543 } 544 545 static int virtio_mmio_load_config(DeviceState *opaque, QEMUFile *f) 546 { 547 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 548 549 proxy->host_features_sel = qemu_get_be32(f); 550 proxy->guest_features_sel = qemu_get_be32(f); 551 proxy->guest_page_shift = qemu_get_be32(f); 552 return 0; 553 } 554 555 static void virtio_mmio_save_config(DeviceState *opaque, QEMUFile *f) 556 { 557 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 558 559 qemu_put_be32(f, proxy->host_features_sel); 560 qemu_put_be32(f, proxy->guest_features_sel); 561 qemu_put_be32(f, proxy->guest_page_shift); 562 } 563 564 static const VMStateDescription vmstate_virtio_mmio_queue_state = { 565 .name = "virtio_mmio/queue_state", 566 .version_id = 1, 567 .minimum_version_id = 1, 568 .fields = (VMStateField[]) { 569 VMSTATE_UINT16(num, VirtIOMMIOQueue), 570 VMSTATE_BOOL(enabled, VirtIOMMIOQueue), 571 VMSTATE_UINT32_ARRAY(desc, VirtIOMMIOQueue, 2), 572 VMSTATE_UINT32_ARRAY(avail, VirtIOMMIOQueue, 2), 573 VMSTATE_UINT32_ARRAY(used, VirtIOMMIOQueue, 2), 574 VMSTATE_END_OF_LIST() 575 } 576 }; 577 578 static const VMStateDescription vmstate_virtio_mmio_state_sub = { 579 .name = "virtio_mmio/state", 580 .version_id = 1, 581 .minimum_version_id = 1, 582 .fields = (VMStateField[]) { 583 VMSTATE_UINT32_ARRAY(guest_features, VirtIOMMIOProxy, 2), 584 VMSTATE_STRUCT_ARRAY(vqs, VirtIOMMIOProxy, VIRTIO_QUEUE_MAX, 0, 585 vmstate_virtio_mmio_queue_state, 586 VirtIOMMIOQueue), 587 VMSTATE_END_OF_LIST() 588 } 589 }; 590 591 static const VMStateDescription vmstate_virtio_mmio = { 592 .name = "virtio_mmio", 593 .version_id = 1, 594 .minimum_version_id = 1, 595 .fields = (VMStateField[]) { 596 VMSTATE_END_OF_LIST() 597 }, 598 .subsections = (const VMStateDescription * []) { 599 &vmstate_virtio_mmio_state_sub, 600 NULL 601 } 602 }; 603 604 static void virtio_mmio_save_extra_state(DeviceState *opaque, QEMUFile *f) 605 { 606 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 607 608 vmstate_save_state(f, &vmstate_virtio_mmio, proxy, NULL); 609 } 610 611 static int virtio_mmio_load_extra_state(DeviceState *opaque, QEMUFile *f) 612 { 613 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 614 615 return vmstate_load_state(f, &vmstate_virtio_mmio, proxy, 1); 616 } 617 618 static bool virtio_mmio_has_extra_state(DeviceState *opaque) 619 { 620 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 621 622 return !proxy->legacy; 623 } 624 625 static void virtio_mmio_reset(DeviceState *d) 626 { 627 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 628 int i; 629 630 virtio_mmio_soft_reset(proxy); 631 632 proxy->host_features_sel = 0; 633 proxy->guest_features_sel = 0; 634 proxy->guest_page_shift = 0; 635 636 if (!proxy->legacy) { 637 proxy->guest_features[0] = proxy->guest_features[1] = 0; 638 639 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { 640 proxy->vqs[i].num = 0; 641 proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0; 642 proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0; 643 proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0; 644 } 645 } 646 } 647 648 static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign, 649 bool with_irqfd) 650 { 651 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 652 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 653 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 654 VirtQueue *vq = virtio_get_queue(vdev, n); 655 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 656 657 if (assign) { 658 int r = event_notifier_init(notifier, 0); 659 if (r < 0) { 660 return r; 661 } 662 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); 663 } else { 664 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); 665 event_notifier_cleanup(notifier); 666 } 667 668 if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) { 669 vdc->guest_notifier_mask(vdev, n, !assign); 670 } 671 672 return 0; 673 } 674 static int virtio_mmio_set_config_guest_notifier(DeviceState *d, bool assign, 675 bool with_irqfd) 676 { 677 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 678 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 679 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 680 EventNotifier *notifier = virtio_config_get_guest_notifier(vdev); 681 int r = 0; 682 683 if (assign) { 684 r = event_notifier_init(notifier, 0); 685 if (r < 0) { 686 return r; 687 } 688 virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd); 689 } else { 690 virtio_config_set_guest_notifier_fd_handler(vdev, assign, with_irqfd); 691 event_notifier_cleanup(notifier); 692 } 693 if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) { 694 vdc->guest_notifier_mask(vdev, VIRTIO_CONFIG_IRQ_IDX, !assign); 695 } 696 return r; 697 } 698 static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs, 699 bool assign) 700 { 701 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 702 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 703 /* TODO: need to check if kvm-arm supports irqfd */ 704 bool with_irqfd = false; 705 int r, n; 706 707 nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX); 708 709 for (n = 0; n < nvqs; n++) { 710 if (!virtio_queue_get_num(vdev, n)) { 711 break; 712 } 713 714 r = virtio_mmio_set_guest_notifier(d, n, assign, with_irqfd); 715 if (r < 0) { 716 goto assign_error; 717 } 718 } 719 r = virtio_mmio_set_config_guest_notifier(d, assign, with_irqfd); 720 if (r < 0) { 721 goto assign_error; 722 } 723 724 return 0; 725 726 assign_error: 727 /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */ 728 assert(assign); 729 while (--n >= 0) { 730 virtio_mmio_set_guest_notifier(d, n, !assign, false); 731 } 732 return r; 733 } 734 735 static void virtio_mmio_pre_plugged(DeviceState *d, Error **errp) 736 { 737 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 738 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 739 740 if (!proxy->legacy) { 741 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 742 } 743 } 744 745 /* virtio-mmio device */ 746 747 static Property virtio_mmio_properties[] = { 748 DEFINE_PROP_BOOL("format_transport_address", VirtIOMMIOProxy, 749 format_transport_address, true), 750 DEFINE_PROP_BOOL("force-legacy", VirtIOMMIOProxy, legacy, true), 751 DEFINE_PROP_BIT("ioeventfd", VirtIOMMIOProxy, flags, 752 VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD_BIT, true), 753 DEFINE_PROP_END_OF_LIST(), 754 }; 755 756 static void virtio_mmio_realizefn(DeviceState *d, Error **errp) 757 { 758 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 759 SysBusDevice *sbd = SYS_BUS_DEVICE(d); 760 761 qbus_init(&proxy->bus, sizeof(proxy->bus), TYPE_VIRTIO_MMIO_BUS, d, NULL); 762 sysbus_init_irq(sbd, &proxy->irq); 763 764 /* fd-based ioevents can't be synchronized in record/replay */ 765 if (replay_mode != REPLAY_MODE_NONE) { 766 proxy->flags &= ~VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD; 767 } 768 769 if (proxy->legacy) { 770 memory_region_init_io(&proxy->iomem, OBJECT(d), 771 &virtio_legacy_mem_ops, proxy, 772 TYPE_VIRTIO_MMIO, 0x200); 773 } else { 774 memory_region_init_io(&proxy->iomem, OBJECT(d), 775 &virtio_mem_ops, proxy, 776 TYPE_VIRTIO_MMIO, 0x200); 777 } 778 sysbus_init_mmio(sbd, &proxy->iomem); 779 } 780 781 static void virtio_mmio_class_init(ObjectClass *klass, void *data) 782 { 783 DeviceClass *dc = DEVICE_CLASS(klass); 784 785 dc->realize = virtio_mmio_realizefn; 786 dc->reset = virtio_mmio_reset; 787 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 788 device_class_set_props(dc, virtio_mmio_properties); 789 } 790 791 static const TypeInfo virtio_mmio_info = { 792 .name = TYPE_VIRTIO_MMIO, 793 .parent = TYPE_SYS_BUS_DEVICE, 794 .instance_size = sizeof(VirtIOMMIOProxy), 795 .class_init = virtio_mmio_class_init, 796 }; 797 798 /* virtio-mmio-bus. */ 799 800 static char *virtio_mmio_bus_get_dev_path(DeviceState *dev) 801 { 802 BusState *virtio_mmio_bus; 803 VirtIOMMIOProxy *virtio_mmio_proxy; 804 char *proxy_path; 805 char *path; 806 MemoryRegionSection section; 807 808 virtio_mmio_bus = qdev_get_parent_bus(dev); 809 virtio_mmio_proxy = VIRTIO_MMIO(virtio_mmio_bus->parent); 810 proxy_path = qdev_get_dev_path(DEVICE(virtio_mmio_proxy)); 811 812 /* 813 * If @format_transport_address is false, then we just perform the same as 814 * virtio_bus_get_dev_path(): we delegate the address formatting for the 815 * device on the virtio-mmio bus to the bus that the virtio-mmio proxy 816 * (i.e., the device that implements the virtio-mmio bus) resides on. In 817 * this case the base address of the virtio-mmio transport will be 818 * invisible. 819 */ 820 if (!virtio_mmio_proxy->format_transport_address) { 821 return proxy_path; 822 } 823 824 /* Otherwise, we append the base address of the transport. */ 825 section = memory_region_find(&virtio_mmio_proxy->iomem, 0, 0x200); 826 assert(section.mr); 827 828 if (proxy_path) { 829 path = g_strdup_printf("%s/virtio-mmio@" HWADDR_FMT_plx, proxy_path, 830 section.offset_within_address_space); 831 } else { 832 path = g_strdup_printf("virtio-mmio@" HWADDR_FMT_plx, 833 section.offset_within_address_space); 834 } 835 memory_region_unref(section.mr); 836 837 g_free(proxy_path); 838 return path; 839 } 840 841 static void virtio_mmio_vmstate_change(DeviceState *d, bool running) 842 { 843 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 844 845 if (running) { 846 virtio_mmio_start_ioeventfd(proxy); 847 } else { 848 virtio_mmio_stop_ioeventfd(proxy); 849 } 850 } 851 852 static void virtio_mmio_bus_class_init(ObjectClass *klass, void *data) 853 { 854 BusClass *bus_class = BUS_CLASS(klass); 855 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 856 857 k->notify = virtio_mmio_update_irq; 858 k->save_config = virtio_mmio_save_config; 859 k->load_config = virtio_mmio_load_config; 860 k->save_extra_state = virtio_mmio_save_extra_state; 861 k->load_extra_state = virtio_mmio_load_extra_state; 862 k->has_extra_state = virtio_mmio_has_extra_state; 863 k->set_guest_notifiers = virtio_mmio_set_guest_notifiers; 864 k->ioeventfd_enabled = virtio_mmio_ioeventfd_enabled; 865 k->ioeventfd_assign = virtio_mmio_ioeventfd_assign; 866 k->pre_plugged = virtio_mmio_pre_plugged; 867 k->vmstate_change = virtio_mmio_vmstate_change; 868 k->has_variable_vring_alignment = true; 869 bus_class->max_dev = 1; 870 bus_class->get_dev_path = virtio_mmio_bus_get_dev_path; 871 } 872 873 static const TypeInfo virtio_mmio_bus_info = { 874 .name = TYPE_VIRTIO_MMIO_BUS, 875 .parent = TYPE_VIRTIO_BUS, 876 .instance_size = sizeof(VirtioBusState), 877 .class_init = virtio_mmio_bus_class_init, 878 }; 879 880 static void virtio_mmio_register_types(void) 881 { 882 type_register_static(&virtio_mmio_bus_info); 883 type_register_static(&virtio_mmio_info); 884 } 885 886 type_init(virtio_mmio_register_types) 887