virtio-mmio.c (27946B)
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 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_mmio_soft_reset(proxy); 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_mmio_soft_reset(proxy); 436 } 437 break; 438 case VIRTIO_MMIO_QUEUE_DESC_LOW: 439 if (proxy->legacy) { 440 qemu_log_mask(LOG_GUEST_ERROR, 441 "%s: write to non-legacy register (0x%" 442 HWADDR_PRIx ") in legacy mode\n", 443 __func__, offset); 444 return; 445 } 446 proxy->vqs[vdev->queue_sel].desc[0] = value; 447 break; 448 case VIRTIO_MMIO_QUEUE_DESC_HIGH: 449 if (proxy->legacy) { 450 qemu_log_mask(LOG_GUEST_ERROR, 451 "%s: write to non-legacy register (0x%" 452 HWADDR_PRIx ") in legacy mode\n", 453 __func__, offset); 454 return; 455 } 456 proxy->vqs[vdev->queue_sel].desc[1] = value; 457 break; 458 case VIRTIO_MMIO_QUEUE_AVAIL_LOW: 459 if (proxy->legacy) { 460 qemu_log_mask(LOG_GUEST_ERROR, 461 "%s: write to non-legacy register (0x%" 462 HWADDR_PRIx ") in legacy mode\n", 463 __func__, offset); 464 return; 465 } 466 proxy->vqs[vdev->queue_sel].avail[0] = value; 467 break; 468 case VIRTIO_MMIO_QUEUE_AVAIL_HIGH: 469 if (proxy->legacy) { 470 qemu_log_mask(LOG_GUEST_ERROR, 471 "%s: write to non-legacy register (0x%" 472 HWADDR_PRIx ") in legacy mode\n", 473 __func__, offset); 474 return; 475 } 476 proxy->vqs[vdev->queue_sel].avail[1] = value; 477 break; 478 case VIRTIO_MMIO_QUEUE_USED_LOW: 479 if (proxy->legacy) { 480 qemu_log_mask(LOG_GUEST_ERROR, 481 "%s: write to non-legacy register (0x%" 482 HWADDR_PRIx ") in legacy mode\n", 483 __func__, offset); 484 return; 485 } 486 proxy->vqs[vdev->queue_sel].used[0] = value; 487 break; 488 case VIRTIO_MMIO_QUEUE_USED_HIGH: 489 if (proxy->legacy) { 490 qemu_log_mask(LOG_GUEST_ERROR, 491 "%s: write to non-legacy register (0x%" 492 HWADDR_PRIx ") in legacy mode\n", 493 __func__, offset); 494 return; 495 } 496 proxy->vqs[vdev->queue_sel].used[1] = value; 497 break; 498 case VIRTIO_MMIO_MAGIC_VALUE: 499 case VIRTIO_MMIO_VERSION: 500 case VIRTIO_MMIO_DEVICE_ID: 501 case VIRTIO_MMIO_VENDOR_ID: 502 case VIRTIO_MMIO_DEVICE_FEATURES: 503 case VIRTIO_MMIO_QUEUE_NUM_MAX: 504 case VIRTIO_MMIO_INTERRUPT_STATUS: 505 case VIRTIO_MMIO_CONFIG_GENERATION: 506 qemu_log_mask(LOG_GUEST_ERROR, 507 "%s: write to read-only register (0x%" HWADDR_PRIx ")\n", 508 __func__, offset); 509 break; 510 511 default: 512 qemu_log_mask(LOG_GUEST_ERROR, 513 "%s: bad register offset (0x%" HWADDR_PRIx ")\n", 514 __func__, offset); 515 } 516 } 517 518 static const MemoryRegionOps virtio_legacy_mem_ops = { 519 .read = virtio_mmio_read, 520 .write = virtio_mmio_write, 521 .endianness = DEVICE_NATIVE_ENDIAN, 522 }; 523 524 static const MemoryRegionOps virtio_mem_ops = { 525 .read = virtio_mmio_read, 526 .write = virtio_mmio_write, 527 .endianness = DEVICE_LITTLE_ENDIAN, 528 }; 529 530 static void virtio_mmio_update_irq(DeviceState *opaque, uint16_t vector) 531 { 532 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 533 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 534 int level; 535 536 if (!vdev) { 537 return; 538 } 539 level = (qatomic_read(&vdev->isr) != 0); 540 trace_virtio_mmio_setting_irq(level); 541 qemu_set_irq(proxy->irq, level); 542 } 543 544 static int virtio_mmio_load_config(DeviceState *opaque, QEMUFile *f) 545 { 546 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 547 548 proxy->host_features_sel = qemu_get_be32(f); 549 proxy->guest_features_sel = qemu_get_be32(f); 550 proxy->guest_page_shift = qemu_get_be32(f); 551 return 0; 552 } 553 554 static void virtio_mmio_save_config(DeviceState *opaque, QEMUFile *f) 555 { 556 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 557 558 qemu_put_be32(f, proxy->host_features_sel); 559 qemu_put_be32(f, proxy->guest_features_sel); 560 qemu_put_be32(f, proxy->guest_page_shift); 561 } 562 563 static const VMStateDescription vmstate_virtio_mmio_queue_state = { 564 .name = "virtio_mmio/queue_state", 565 .version_id = 1, 566 .minimum_version_id = 1, 567 .fields = (VMStateField[]) { 568 VMSTATE_UINT16(num, VirtIOMMIOQueue), 569 VMSTATE_BOOL(enabled, VirtIOMMIOQueue), 570 VMSTATE_UINT32_ARRAY(desc, VirtIOMMIOQueue, 2), 571 VMSTATE_UINT32_ARRAY(avail, VirtIOMMIOQueue, 2), 572 VMSTATE_UINT32_ARRAY(used, VirtIOMMIOQueue, 2), 573 VMSTATE_END_OF_LIST() 574 } 575 }; 576 577 static const VMStateDescription vmstate_virtio_mmio_state_sub = { 578 .name = "virtio_mmio/state", 579 .version_id = 1, 580 .minimum_version_id = 1, 581 .fields = (VMStateField[]) { 582 VMSTATE_UINT32_ARRAY(guest_features, VirtIOMMIOProxy, 2), 583 VMSTATE_STRUCT_ARRAY(vqs, VirtIOMMIOProxy, VIRTIO_QUEUE_MAX, 0, 584 vmstate_virtio_mmio_queue_state, 585 VirtIOMMIOQueue), 586 VMSTATE_END_OF_LIST() 587 } 588 }; 589 590 static const VMStateDescription vmstate_virtio_mmio = { 591 .name = "virtio_mmio", 592 .version_id = 1, 593 .minimum_version_id = 1, 594 .fields = (VMStateField[]) { 595 VMSTATE_END_OF_LIST() 596 }, 597 .subsections = (const VMStateDescription * []) { 598 &vmstate_virtio_mmio_state_sub, 599 NULL 600 } 601 }; 602 603 static void virtio_mmio_save_extra_state(DeviceState *opaque, QEMUFile *f) 604 { 605 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 606 607 vmstate_save_state(f, &vmstate_virtio_mmio, proxy, NULL); 608 } 609 610 static int virtio_mmio_load_extra_state(DeviceState *opaque, QEMUFile *f) 611 { 612 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 613 614 return vmstate_load_state(f, &vmstate_virtio_mmio, proxy, 1); 615 } 616 617 static bool virtio_mmio_has_extra_state(DeviceState *opaque) 618 { 619 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); 620 621 return !proxy->legacy; 622 } 623 624 static void virtio_mmio_reset(DeviceState *d) 625 { 626 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 627 int i; 628 629 virtio_mmio_soft_reset(proxy); 630 631 proxy->host_features_sel = 0; 632 proxy->guest_features_sel = 0; 633 proxy->guest_page_shift = 0; 634 635 if (!proxy->legacy) { 636 proxy->guest_features[0] = proxy->guest_features[1] = 0; 637 638 for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { 639 proxy->vqs[i].num = 0; 640 proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0; 641 proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0; 642 proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0; 643 } 644 } 645 } 646 647 static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign, 648 bool with_irqfd) 649 { 650 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 651 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 652 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 653 VirtQueue *vq = virtio_get_queue(vdev, n); 654 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 655 656 if (assign) { 657 int r = event_notifier_init(notifier, 0); 658 if (r < 0) { 659 return r; 660 } 661 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); 662 } else { 663 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); 664 event_notifier_cleanup(notifier); 665 } 666 667 if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) { 668 vdc->guest_notifier_mask(vdev, n, !assign); 669 } 670 671 return 0; 672 } 673 674 static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs, 675 bool assign) 676 { 677 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 678 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 679 /* TODO: need to check if kvm-arm supports irqfd */ 680 bool with_irqfd = false; 681 int r, n; 682 683 nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX); 684 685 for (n = 0; n < nvqs; n++) { 686 if (!virtio_queue_get_num(vdev, n)) { 687 break; 688 } 689 690 r = virtio_mmio_set_guest_notifier(d, n, assign, with_irqfd); 691 if (r < 0) { 692 goto assign_error; 693 } 694 } 695 696 return 0; 697 698 assign_error: 699 /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */ 700 assert(assign); 701 while (--n >= 0) { 702 virtio_mmio_set_guest_notifier(d, n, !assign, false); 703 } 704 return r; 705 } 706 707 static void virtio_mmio_pre_plugged(DeviceState *d, Error **errp) 708 { 709 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 710 VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); 711 712 if (!proxy->legacy) { 713 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 714 } 715 } 716 717 /* virtio-mmio device */ 718 719 static Property virtio_mmio_properties[] = { 720 DEFINE_PROP_BOOL("format_transport_address", VirtIOMMIOProxy, 721 format_transport_address, true), 722 DEFINE_PROP_BOOL("force-legacy", VirtIOMMIOProxy, legacy, true), 723 DEFINE_PROP_BIT("ioeventfd", VirtIOMMIOProxy, flags, 724 VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD_BIT, true), 725 DEFINE_PROP_END_OF_LIST(), 726 }; 727 728 static void virtio_mmio_realizefn(DeviceState *d, Error **errp) 729 { 730 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 731 SysBusDevice *sbd = SYS_BUS_DEVICE(d); 732 733 qbus_init(&proxy->bus, sizeof(proxy->bus), TYPE_VIRTIO_MMIO_BUS, d, NULL); 734 sysbus_init_irq(sbd, &proxy->irq); 735 736 if (!kvm_eventfds_enabled()) { 737 proxy->flags &= ~VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD; 738 } 739 740 /* fd-based ioevents can't be synchronized in record/replay */ 741 if (replay_mode != REPLAY_MODE_NONE) { 742 proxy->flags &= ~VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD; 743 } 744 745 if (proxy->legacy) { 746 memory_region_init_io(&proxy->iomem, OBJECT(d), 747 &virtio_legacy_mem_ops, proxy, 748 TYPE_VIRTIO_MMIO, 0x200); 749 } else { 750 memory_region_init_io(&proxy->iomem, OBJECT(d), 751 &virtio_mem_ops, proxy, 752 TYPE_VIRTIO_MMIO, 0x200); 753 } 754 sysbus_init_mmio(sbd, &proxy->iomem); 755 } 756 757 static void virtio_mmio_class_init(ObjectClass *klass, void *data) 758 { 759 DeviceClass *dc = DEVICE_CLASS(klass); 760 761 dc->realize = virtio_mmio_realizefn; 762 dc->reset = virtio_mmio_reset; 763 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 764 device_class_set_props(dc, virtio_mmio_properties); 765 } 766 767 static const TypeInfo virtio_mmio_info = { 768 .name = TYPE_VIRTIO_MMIO, 769 .parent = TYPE_SYS_BUS_DEVICE, 770 .instance_size = sizeof(VirtIOMMIOProxy), 771 .class_init = virtio_mmio_class_init, 772 }; 773 774 /* virtio-mmio-bus. */ 775 776 static char *virtio_mmio_bus_get_dev_path(DeviceState *dev) 777 { 778 BusState *virtio_mmio_bus; 779 VirtIOMMIOProxy *virtio_mmio_proxy; 780 char *proxy_path; 781 char *path; 782 MemoryRegionSection section; 783 784 virtio_mmio_bus = qdev_get_parent_bus(dev); 785 virtio_mmio_proxy = VIRTIO_MMIO(virtio_mmio_bus->parent); 786 proxy_path = qdev_get_dev_path(DEVICE(virtio_mmio_proxy)); 787 788 /* 789 * If @format_transport_address is false, then we just perform the same as 790 * virtio_bus_get_dev_path(): we delegate the address formatting for the 791 * device on the virtio-mmio bus to the bus that the virtio-mmio proxy 792 * (i.e., the device that implements the virtio-mmio bus) resides on. In 793 * this case the base address of the virtio-mmio transport will be 794 * invisible. 795 */ 796 if (!virtio_mmio_proxy->format_transport_address) { 797 return proxy_path; 798 } 799 800 /* Otherwise, we append the base address of the transport. */ 801 section = memory_region_find(&virtio_mmio_proxy->iomem, 0, 0x200); 802 assert(section.mr); 803 804 if (proxy_path) { 805 path = g_strdup_printf("%s/virtio-mmio@" TARGET_FMT_plx, proxy_path, 806 section.offset_within_address_space); 807 } else { 808 path = g_strdup_printf("virtio-mmio@" TARGET_FMT_plx, 809 section.offset_within_address_space); 810 } 811 memory_region_unref(section.mr); 812 813 g_free(proxy_path); 814 return path; 815 } 816 817 static void virtio_mmio_vmstate_change(DeviceState *d, bool running) 818 { 819 VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); 820 821 if (running) { 822 virtio_mmio_start_ioeventfd(proxy); 823 } else { 824 virtio_mmio_stop_ioeventfd(proxy); 825 } 826 } 827 828 static void virtio_mmio_bus_class_init(ObjectClass *klass, void *data) 829 { 830 BusClass *bus_class = BUS_CLASS(klass); 831 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 832 833 k->notify = virtio_mmio_update_irq; 834 k->save_config = virtio_mmio_save_config; 835 k->load_config = virtio_mmio_load_config; 836 k->save_extra_state = virtio_mmio_save_extra_state; 837 k->load_extra_state = virtio_mmio_load_extra_state; 838 k->has_extra_state = virtio_mmio_has_extra_state; 839 k->set_guest_notifiers = virtio_mmio_set_guest_notifiers; 840 k->ioeventfd_enabled = virtio_mmio_ioeventfd_enabled; 841 k->ioeventfd_assign = virtio_mmio_ioeventfd_assign; 842 k->pre_plugged = virtio_mmio_pre_plugged; 843 k->vmstate_change = virtio_mmio_vmstate_change; 844 k->has_variable_vring_alignment = true; 845 bus_class->max_dev = 1; 846 bus_class->get_dev_path = virtio_mmio_bus_get_dev_path; 847 } 848 849 static const TypeInfo virtio_mmio_bus_info = { 850 .name = TYPE_VIRTIO_MMIO_BUS, 851 .parent = TYPE_VIRTIO_BUS, 852 .instance_size = sizeof(VirtioBusState), 853 .class_init = virtio_mmio_bus_class_init, 854 }; 855 856 static void virtio_mmio_register_types(void) 857 { 858 type_register_static(&virtio_mmio_bus_info); 859 type_register_static(&virtio_mmio_info); 860 } 861 862 type_init(virtio_mmio_register_types)