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 if (proxy->legacy) { 76 return; 77 } 78 79 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { 80 proxy->vqs[i].enabled = 0; 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 proxy->vqs[vdev->queue_sel].num = value; 358 } 359 break; 360 case VIRTIO_MMIO_QUEUE_ALIGN: 361 if (!proxy->legacy) { 362 qemu_log_mask(LOG_GUEST_ERROR, 363 "%s: write to legacy register (0x%" 364 HWADDR_PRIx ") in non-legacy mode\n", 365 __func__, offset); 366 return; 367 } 368 virtio_queue_set_align(vdev, vdev->queue_sel, value); 369 break; 370 case VIRTIO_MMIO_QUEUE_PFN: 371 if (!proxy->legacy) { 372 qemu_log_mask(LOG_GUEST_ERROR, 373 "%s: write to legacy register (0x%" 374 HWADDR_PRIx ") in non-legacy mode\n", 375 __func__, offset); 376 return; 377 } 378 if (value == 0) { 379 virtio_reset(vdev); 380 } else { 381 virtio_queue_set_addr(vdev, vdev->queue_sel, 382 value << proxy->guest_page_shift); 383 } 384 break; 385 case VIRTIO_MMIO_QUEUE_READY: 386 if (proxy->legacy) { 387 qemu_log_mask(LOG_GUEST_ERROR, 388 "%s: write to non-legacy register (0x%" 389 HWADDR_PRIx ") in legacy mode\n", 390 __func__, offset); 391 return; 392 } 393 if (value) { 394 virtio_queue_set_num(vdev, vdev->queue_sel, 395 proxy->vqs[vdev->queue_sel].num); 396 virtio_queue_set_rings(vdev, vdev->queue_sel, 397 ((uint64_t)proxy->vqs[vdev->queue_sel].desc[1]) << 32 | 398 proxy->vqs[vdev->queue_sel].desc[0], 399 ((uint64_t)proxy->vqs[vdev->queue_sel].avail[1]) << 32 | 400 proxy->vqs[vdev->queue_sel].avail[0], 401 ((uint64_t)proxy->vqs[vdev->queue_sel].used[1]) << 32 | 402 proxy->vqs[vdev->queue_sel].used[0]); 403 proxy->vqs[vdev->queue_sel].enabled = 1; 404 } else { 405 proxy->vqs[vdev->queue_sel].enabled = 0; 406 } 407 break; 408 case VIRTIO_MMIO_QUEUE_NOTIFY: 409 if (value < VIRTIO_QUEUE_MAX) { 410 virtio_queue_notify(vdev, value); 411 } 412 break; 413 case VIRTIO_MMIO_INTERRUPT_ACK: 414 qatomic_and(&vdev->isr, ~value); 415 virtio_update_irq(vdev); 416 break; 417 case VIRTIO_MMIO_STATUS: 418 if (!(value & VIRTIO_CONFIG_S_DRIVER_OK)) { 419 virtio_mmio_stop_ioeventfd(proxy); 420 } 421 422 if (!proxy->legacy && (value & VIRTIO_CONFIG_S_FEATURES_OK)) { 423 virtio_set_features(vdev, 424 ((uint64_t)proxy->guest_features[1]) << 32 | 425 proxy->guest_features[0]); 426 } 427 428 virtio_set_status(vdev, value & 0xff); 429 430 if (value & VIRTIO_CONFIG_S_DRIVER_OK) { 431 virtio_mmio_start_ioeventfd(proxy); 432 } 433 434 if (vdev->status == 0) { 435 virtio_reset(vdev); 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 .minimum_version_id_old = 1, 596 .fields = (VMStateField[]) { 597 VMSTATE_END_OF_LIST() 598 }, 599 .subsections = (const VMStateDescription * []) { 600 &vmstate_virtio_mmio_state_sub, 601 NULL 602 } 603 }; 604 605 static void virtio_mmio_save_extra_state(DeviceState *opaque, QEMUFile *f) 606 { 607 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 608 609 vmstate_save_state(f, &vmstate_virtio_mmio, proxy, NULL); 610 } 611 612 static int virtio_mmio_load_extra_state(DeviceState *opaque, QEMUFile *f) 613 { 614 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 615 616 return vmstate_load_state(f, &vmstate_virtio_mmio, proxy, 1); 617 } 618 619 static bool virtio_mmio_has_extra_state(DeviceState *opaque) 620 { 621 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 622 623 return !proxy->legacy; 624 } 625 626 static void virtio_mmio_reset(DeviceState *d) 627 { 628 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 629 int i; 630 631 virtio_mmio_stop_ioeventfd(proxy); 632 virtio_bus_reset(&proxy->bus); 633 proxy->host_features_sel = 0; 634 proxy->guest_features_sel = 0; 635 proxy->guest_page_shift = 0; 636 637 if (!proxy->legacy) { 638 proxy->guest_features[0] = proxy->guest_features[1] = 0; 639 640 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { 641 proxy->vqs[i].enabled = 0; 642 proxy->vqs[i].num = 0; 643 proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0; 644 proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0; 645 proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0; 646 } 647 } 648 } 649 650 static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign, 651 bool with_irqfd) 652 { 653 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 654 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 655 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 656 VirtQueue *vq = virtio_get_queue(vdev, n); 657 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 658 659 if (assign) { 660 int r = event_notifier_init(notifier, 0); 661 if (r < 0) { 662 return r; 663 } 664 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); 665 } else { 666 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); 667 event_notifier_cleanup(notifier); 668 } 669 670 if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) { 671 vdc->guest_notifier_mask(vdev, n, !assign); 672 } 673 674 return 0; 675 } 676 677 static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs, 678 bool assign) 679 { 680 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 681 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 682 /* TODO: need to check if kvm-arm supports irqfd */ 683 bool with_irqfd = false; 684 int r, n; 685 686 nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX); 687 688 for (n = 0; n < nvqs; n++) { 689 if (!virtio_queue_get_num(vdev, n)) { 690 break; 691 } 692 693 r = virtio_mmio_set_guest_notifier(d, n, assign, with_irqfd); 694 if (r < 0) { 695 goto assign_error; 696 } 697 } 698 699 return 0; 700 701 assign_error: 702 /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */ 703 assert(assign); 704 while (--n >= 0) { 705 virtio_mmio_set_guest_notifier(d, n, !assign, false); 706 } 707 return r; 708 } 709 710 static void virtio_mmio_pre_plugged(DeviceState *d, Error **errp) 711 { 712 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 713 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 714 715 if (!proxy->legacy) { 716 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 717 } 718 } 719 720 /* virtio-mmio device */ 721 722 static Property virtio_mmio_properties[] = { 723 DEFINE_PROP_BOOL("format_transport_address", VirtIOMMIOProxy, 724 format_transport_address, true), 725 DEFINE_PROP_BOOL("force-legacy", VirtIOMMIOProxy, legacy, true), 726 DEFINE_PROP_BIT("ioeventfd", VirtIOMMIOProxy, flags, 727 VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD_BIT, true), 728 DEFINE_PROP_END_OF_LIST(), 729 }; 730 731 static void virtio_mmio_realizefn(DeviceState *d, Error **errp) 732 { 733 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 734 SysBusDevice *sbd = SYS_BUS_DEVICE(d); 735 736 qbus_init(&proxy->bus, sizeof(proxy->bus), TYPE_VIRTIO_MMIO_BUS, d, NULL); 737 sysbus_init_irq(sbd, &proxy->irq); 738 739 if (!kvm_eventfds_enabled()) { 740 proxy->flags &= ~VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD; 741 } 742 743 /* fd-based ioevents can't be synchronized in record/replay */ 744 if (replay_mode != REPLAY_MODE_NONE) { 745 proxy->flags &= ~VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD; 746 } 747 748 if (proxy->legacy) { 749 memory_region_init_io(&proxy->iomem, OBJECT(d), 750 &virtio_legacy_mem_ops, proxy, 751 TYPE_VIRTIO_MMIO, 0x200); 752 } else { 753 memory_region_init_io(&proxy->iomem, OBJECT(d), 754 &virtio_mem_ops, proxy, 755 TYPE_VIRTIO_MMIO, 0x200); 756 } 757 sysbus_init_mmio(sbd, &proxy->iomem); 758 } 759 760 static void virtio_mmio_class_init(ObjectClass *klass, void *data) 761 { 762 DeviceClass *dc = DEVICE_CLASS(klass); 763 764 dc->realize = virtio_mmio_realizefn; 765 dc->reset = virtio_mmio_reset; 766 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 767 device_class_set_props(dc, virtio_mmio_properties); 768 } 769 770 static const TypeInfo virtio_mmio_info = { 771 .name = TYPE_VIRTIO_MMIO, 772 .parent = TYPE_SYS_BUS_DEVICE, 773 .instance_size = sizeof(VirtIOMMIOProxy), 774 .class_init = virtio_mmio_class_init, 775 }; 776 777 /* virtio-mmio-bus. */ 778 779 static char *virtio_mmio_bus_get_dev_path(DeviceState *dev) 780 { 781 BusState *virtio_mmio_bus; 782 VirtIOMMIOProxy *virtio_mmio_proxy; 783 char *proxy_path; 784 char *path; 785 MemoryRegionSection section; 786 787 virtio_mmio_bus = qdev_get_parent_bus(dev); 788 virtio_mmio_proxy = VIRTIO_MMIO(virtio_mmio_bus->parent); 789 proxy_path = qdev_get_dev_path(DEVICE(virtio_mmio_proxy)); 790 791 /* 792 * If @format_transport_address is false, then we just perform the same as 793 * virtio_bus_get_dev_path(): we delegate the address formatting for the 794 * device on the virtio-mmio bus to the bus that the virtio-mmio proxy 795 * (i.e., the device that implements the virtio-mmio bus) resides on. In 796 * this case the base address of the virtio-mmio transport will be 797 * invisible. 798 */ 799 if (!virtio_mmio_proxy->format_transport_address) { 800 return proxy_path; 801 } 802 803 /* Otherwise, we append the base address of the transport. */ 804 section = memory_region_find(&virtio_mmio_proxy->iomem, 0, 0x200); 805 assert(section.mr); 806 807 if (proxy_path) { 808 path = g_strdup_printf("%s/virtio-mmio@" TARGET_FMT_plx, proxy_path, 809 section.offset_within_address_space); 810 } else { 811 path = g_strdup_printf("virtio-mmio@" TARGET_FMT_plx, 812 section.offset_within_address_space); 813 } 814 memory_region_unref(section.mr); 815 816 g_free(proxy_path); 817 return path; 818 } 819 820 static void virtio_mmio_bus_class_init(ObjectClass *klass, void *data) 821 { 822 BusClass *bus_class = BUS_CLASS(klass); 823 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 824 825 k->notify = virtio_mmio_update_irq; 826 k->save_config = virtio_mmio_save_config; 827 k->load_config = virtio_mmio_load_config; 828 k->save_extra_state = virtio_mmio_save_extra_state; 829 k->load_extra_state = virtio_mmio_load_extra_state; 830 k->has_extra_state = virtio_mmio_has_extra_state; 831 k->set_guest_notifiers = virtio_mmio_set_guest_notifiers; 832 k->ioeventfd_enabled = virtio_mmio_ioeventfd_enabled; 833 k->ioeventfd_assign = virtio_mmio_ioeventfd_assign; 834 k->pre_plugged = virtio_mmio_pre_plugged; 835 k->has_variable_vring_alignment = true; 836 bus_class->max_dev = 1; 837 bus_class->get_dev_path = virtio_mmio_bus_get_dev_path; 838 } 839 840 static const TypeInfo virtio_mmio_bus_info = { 841 .name = TYPE_VIRTIO_MMIO_BUS, 842 .parent = TYPE_VIRTIO_BUS, 843 .instance_size = sizeof(VirtioBusState), 844 .class_init = virtio_mmio_bus_class_init, 845 }; 846 847 static void virtio_mmio_register_types(void) 848 { 849 type_register_static(&virtio_mmio_bus_info); 850 type_register_static(&virtio_mmio_info); 851 } 852 853 type_init(virtio_mmio_register_types) 854