| 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/core/irq.h" |
| 25 | #include "hw/core/qdev-properties.h" |
| 26 | #include "hw/core/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 "system/kvm.h" |
| 32 | #include "system/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 | #include "qapi/error.h" |
| 38 | |
| 39 | static bool virtio_mmio_ioeventfd_enabled(DeviceState *d) |
| 40 | { |
| 41 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| 42 | |
| 43 | return (proxy->flags & VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD) != 0; |
| 44 | } |
| 45 | |
| 46 | static int virtio_mmio_ioeventfd_assign(DeviceState *d, |
| 47 | EventNotifier *notifier, |
| 48 | int n, bool assign) |
| 49 | { |
| 50 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| 51 | |
| 52 | if (assign) { |
| 53 | memory_region_add_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUE_NOTIFY, 4, |
| 54 | true, n, notifier); |
| 55 | } else { |
| 56 | memory_region_del_eventfd(&proxy->iomem, VIRTIO_MMIO_QUEUE_NOTIFY, 4, |
| 57 | true, n, notifier); |
| 58 | } |
| 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | static void virtio_mmio_start_ioeventfd(VirtIOMMIOProxy *proxy) |
| 63 | { |
| 64 | virtio_bus_start_ioeventfd(&proxy->bus); |
| 65 | } |
| 66 | |
| 67 | static void virtio_mmio_stop_ioeventfd(VirtIOMMIOProxy *proxy) |
| 68 | { |
| 69 | virtio_bus_stop_ioeventfd(&proxy->bus); |
| 70 | } |
| 71 | |
| 72 | static void virtio_mmio_soft_reset(VirtIOMMIOProxy *proxy) |
| 73 | { |
| 74 | int i; |
| 75 | |
| 76 | virtio_bus_reset(&proxy->bus); |
| 77 | |
| 78 | if (!proxy->legacy) { |
| 79 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
| 80 | proxy->vqs[i].enabled = 0; |
| 81 | } |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | static uint64_t virtio_mmio_read(void *opaque, hwaddr offset, unsigned size) |
| 86 | { |
| 87 | VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque; |
| 88 | VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| 89 | |
| 90 | trace_virtio_mmio_read(offset); |
| 91 | |
| 92 | if (!vdev) { |
| 93 | /* If no backend is present, we treat most registers as |
| 94 | * read-as-zero, except for the magic number, version and |
| 95 | * vendor ID. This is not strictly sanctioned by the virtio |
| 96 | * spec, but it allows us to provide transports with no backend |
| 97 | * plugged in which don't confuse Linux's virtio code: the |
| 98 | * probe won't complain about the bad magic number, but the |
| 99 | * device ID of zero means no backend will claim it. |
| 100 | */ |
| 101 | switch (offset) { |
| 102 | case VIRTIO_MMIO_MAGIC_VALUE: |
| 103 | return VIRT_MAGIC; |
| 104 | case VIRTIO_MMIO_VERSION: |
| 105 | if (proxy->legacy) { |
| 106 | return VIRT_VERSION_LEGACY; |
| 107 | } else { |
| 108 | return VIRT_VERSION; |
| 109 | } |
| 110 | case VIRTIO_MMIO_VENDOR_ID: |
| 111 | return VIRT_VENDOR; |
| 112 | default: |
| 113 | return 0; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | if (offset >= VIRTIO_MMIO_CONFIG) { |
| 118 | offset -= VIRTIO_MMIO_CONFIG; |
| 119 | if (proxy->legacy) { |
| 120 | switch (size) { |
| 121 | case 1: |
| 122 | return virtio_config_readb(vdev, offset); |
| 123 | case 2: |
| 124 | return virtio_config_readw(vdev, offset); |
| 125 | case 4: |
| 126 | return virtio_config_readl(vdev, offset); |
| 127 | default: |
| 128 | abort(); |
| 129 | } |
| 130 | } else { |
| 131 | switch (size) { |
| 132 | case 1: |
| 133 | return virtio_config_modern_readb(vdev, offset); |
| 134 | case 2: |
| 135 | return virtio_config_modern_readw(vdev, offset); |
| 136 | case 4: |
| 137 | return virtio_config_modern_readl(vdev, offset); |
| 138 | default: |
| 139 | abort(); |
| 140 | } |
| 141 | } |
| 142 | } |
| 143 | if (size != 4) { |
| 144 | qemu_log_mask(LOG_GUEST_ERROR, |
| 145 | "%s: wrong size access to register!\n", |
| 146 | __func__); |
| 147 | return 0; |
| 148 | } |
| 149 | switch (offset) { |
| 150 | case VIRTIO_MMIO_MAGIC_VALUE: |
| 151 | return VIRT_MAGIC; |
| 152 | case VIRTIO_MMIO_VERSION: |
| 153 | if (proxy->legacy) { |
| 154 | return VIRT_VERSION_LEGACY; |
| 155 | } else { |
| 156 | return VIRT_VERSION; |
| 157 | } |
| 158 | case VIRTIO_MMIO_DEVICE_ID: |
| 159 | return vdev->device_id; |
| 160 | case VIRTIO_MMIO_VENDOR_ID: |
| 161 | return VIRT_VENDOR; |
| 162 | case VIRTIO_MMIO_DEVICE_FEATURES: |
| 163 | if (proxy->legacy) { |
| 164 | if (proxy->host_features_sel) { |
| 165 | return 0; |
| 166 | } else { |
| 167 | return vdev->host_features; |
| 168 | } |
| 169 | } else { |
| 170 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
| 171 | return (vdev->host_features & ~vdc->legacy_features) |
| 172 | >> (32 * proxy->host_features_sel); |
| 173 | } |
| 174 | case VIRTIO_MMIO_QUEUE_NUM_MAX: |
| 175 | return virtio_queue_get_max_num(vdev, vdev->queue_sel); |
| 176 | case VIRTIO_MMIO_QUEUE_PFN: |
| 177 | if (!proxy->legacy) { |
| 178 | qemu_log_mask(LOG_GUEST_ERROR, |
| 179 | "%s: read from legacy register (0x%" |
| 180 | HWADDR_PRIx ") in non-legacy mode\n", |
| 181 | __func__, offset); |
| 182 | return 0; |
| 183 | } |
| 184 | return virtio_queue_get_addr(vdev, vdev->queue_sel) |
| 185 | >> proxy->guest_page_shift; |
| 186 | case VIRTIO_MMIO_QUEUE_READY: |
| 187 | if (proxy->legacy) { |
| 188 | qemu_log_mask(LOG_GUEST_ERROR, |
| 189 | "%s: read from non-legacy register (0x%" |
| 190 | HWADDR_PRIx ") in legacy mode\n", |
| 191 | __func__, offset); |
| 192 | return 0; |
| 193 | } |
| 194 | return proxy->vqs[vdev->queue_sel].enabled; |
| 195 | case VIRTIO_MMIO_INTERRUPT_STATUS: |
| 196 | return qatomic_read(&vdev->isr); |
| 197 | case VIRTIO_MMIO_STATUS: |
| 198 | return vdev->status; |
| 199 | case VIRTIO_MMIO_CONFIG_GENERATION: |
| 200 | if (proxy->legacy) { |
| 201 | qemu_log_mask(LOG_GUEST_ERROR, |
| 202 | "%s: read from non-legacy register (0x%" |
| 203 | HWADDR_PRIx ") in legacy mode\n", |
| 204 | __func__, offset); |
| 205 | return 0; |
| 206 | } |
| 207 | return vdev->generation; |
| 208 | case VIRTIO_MMIO_SHM_LEN_LOW: |
| 209 | case VIRTIO_MMIO_SHM_LEN_HIGH: |
| 210 | /* |
| 211 | * VIRTIO_MMIO_SHM_SEL is unimplemented |
| 212 | * according to the linux driver, if region length is -1 |
| 213 | * the shared memory doesn't exist |
| 214 | */ |
| 215 | return -1; |
| 216 | case VIRTIO_MMIO_DEVICE_FEATURES_SEL: |
| 217 | case VIRTIO_MMIO_DRIVER_FEATURES: |
| 218 | case VIRTIO_MMIO_DRIVER_FEATURES_SEL: |
| 219 | case VIRTIO_MMIO_GUEST_PAGE_SIZE: |
| 220 | case VIRTIO_MMIO_QUEUE_SEL: |
| 221 | case VIRTIO_MMIO_QUEUE_NUM: |
| 222 | case VIRTIO_MMIO_QUEUE_ALIGN: |
| 223 | case VIRTIO_MMIO_QUEUE_NOTIFY: |
| 224 | case VIRTIO_MMIO_INTERRUPT_ACK: |
| 225 | case VIRTIO_MMIO_QUEUE_DESC_LOW: |
| 226 | case VIRTIO_MMIO_QUEUE_DESC_HIGH: |
| 227 | case VIRTIO_MMIO_QUEUE_AVAIL_LOW: |
| 228 | case VIRTIO_MMIO_QUEUE_AVAIL_HIGH: |
| 229 | case VIRTIO_MMIO_QUEUE_USED_LOW: |
| 230 | case VIRTIO_MMIO_QUEUE_USED_HIGH: |
| 231 | qemu_log_mask(LOG_GUEST_ERROR, |
| 232 | "%s: read of write-only register (0x%" HWADDR_PRIx ")\n", |
| 233 | __func__, offset); |
| 234 | return 0; |
| 235 | default: |
| 236 | qemu_log_mask(LOG_GUEST_ERROR, |
| 237 | "%s: bad register offset (0x%" HWADDR_PRIx ")\n", |
| 238 | __func__, offset); |
| 239 | return 0; |
| 240 | } |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | static void virtio_mmio_write(void *opaque, hwaddr offset, uint64_t value, |
| 245 | unsigned size) |
| 246 | { |
| 247 | VirtIOMMIOProxy *proxy = (VirtIOMMIOProxy *)opaque; |
| 248 | VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| 249 | uint16_t vq_idx; |
| 250 | |
| 251 | trace_virtio_mmio_write_offset(offset, value); |
| 252 | |
| 253 | if (!vdev) { |
| 254 | /* If no backend is present, we just make all registers |
| 255 | * write-ignored. This allows us to provide transports with |
| 256 | * no backend plugged in. |
| 257 | */ |
| 258 | return; |
| 259 | } |
| 260 | |
| 261 | if (offset >= VIRTIO_MMIO_CONFIG) { |
| 262 | offset -= VIRTIO_MMIO_CONFIG; |
| 263 | if (proxy->legacy) { |
| 264 | switch (size) { |
| 265 | case 1: |
| 266 | virtio_config_writeb(vdev, offset, value); |
| 267 | break; |
| 268 | case 2: |
| 269 | virtio_config_writew(vdev, offset, value); |
| 270 | break; |
| 271 | case 4: |
| 272 | virtio_config_writel(vdev, offset, value); |
| 273 | break; |
| 274 | default: |
| 275 | abort(); |
| 276 | } |
| 277 | return; |
| 278 | } else { |
| 279 | switch (size) { |
| 280 | case 1: |
| 281 | virtio_config_modern_writeb(vdev, offset, value); |
| 282 | break; |
| 283 | case 2: |
| 284 | virtio_config_modern_writew(vdev, offset, value); |
| 285 | break; |
| 286 | case 4: |
| 287 | virtio_config_modern_writel(vdev, offset, value); |
| 288 | break; |
| 289 | default: |
| 290 | abort(); |
| 291 | } |
| 292 | return; |
| 293 | } |
| 294 | } |
| 295 | if (size != 4) { |
| 296 | qemu_log_mask(LOG_GUEST_ERROR, |
| 297 | "%s: wrong size access to register!\n", |
| 298 | __func__); |
| 299 | return; |
| 300 | } |
| 301 | switch (offset) { |
| 302 | case VIRTIO_MMIO_DEVICE_FEATURES_SEL: |
| 303 | if (value) { |
| 304 | proxy->host_features_sel = 1; |
| 305 | } else { |
| 306 | proxy->host_features_sel = 0; |
| 307 | } |
| 308 | break; |
| 309 | case VIRTIO_MMIO_DRIVER_FEATURES: |
| 310 | if (proxy->legacy) { |
| 311 | if (proxy->guest_features_sel) { |
| 312 | qemu_log_mask(LOG_GUEST_ERROR, |
| 313 | "%s: attempt to write guest features with " |
| 314 | "guest_features_sel > 0 in legacy mode\n", |
| 315 | __func__); |
| 316 | } else { |
| 317 | virtio_set_features(vdev, value); |
| 318 | } |
| 319 | } else { |
| 320 | proxy->guest_features[proxy->guest_features_sel] = value; |
| 321 | } |
| 322 | break; |
| 323 | case VIRTIO_MMIO_DRIVER_FEATURES_SEL: |
| 324 | if (value) { |
| 325 | proxy->guest_features_sel = 1; |
| 326 | } else { |
| 327 | proxy->guest_features_sel = 0; |
| 328 | } |
| 329 | break; |
| 330 | case VIRTIO_MMIO_GUEST_PAGE_SIZE: |
| 331 | if (!proxy->legacy) { |
| 332 | qemu_log_mask(LOG_GUEST_ERROR, |
| 333 | "%s: write to legacy register (0x%" |
| 334 | HWADDR_PRIx ") in non-legacy mode\n", |
| 335 | __func__, offset); |
| 336 | return; |
| 337 | } |
| 338 | proxy->guest_page_shift = ctz32(value); |
| 339 | if (proxy->guest_page_shift > 31) { |
| 340 | proxy->guest_page_shift = 0; |
| 341 | } |
| 342 | trace_virtio_mmio_guest_page(value, proxy->guest_page_shift); |
| 343 | break; |
| 344 | case VIRTIO_MMIO_QUEUE_SEL: |
| 345 | if (value < VIRTIO_QUEUE_MAX) { |
| 346 | vdev->queue_sel = value; |
| 347 | } |
| 348 | break; |
| 349 | case VIRTIO_MMIO_QUEUE_NUM: |
| 350 | trace_virtio_mmio_queue_write(value, VIRTQUEUE_MAX_SIZE); |
| 351 | virtio_queue_set_num(vdev, vdev->queue_sel, value); |
| 352 | |
| 353 | if (proxy->legacy) { |
| 354 | virtio_queue_update_rings(vdev, vdev->queue_sel); |
| 355 | } else { |
| 356 | virtio_init_region_cache(vdev, vdev->queue_sel); |
| 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 | vq_idx = value; |
| 410 | if (vq_idx < VIRTIO_QUEUE_MAX && virtio_queue_get_num(vdev, vq_idx)) { |
| 411 | if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFICATION_DATA)) { |
| 412 | VirtQueue *vq = virtio_get_queue(vdev, vq_idx); |
| 413 | |
| 414 | virtio_queue_set_shadow_avail_idx(vq, (value >> 16) & 0xFFFF); |
| 415 | } |
| 416 | virtio_queue_notify(vdev, vq_idx); |
| 417 | } |
| 418 | break; |
| 419 | case VIRTIO_MMIO_INTERRUPT_ACK: |
| 420 | qatomic_and(&vdev->isr, ~value); |
| 421 | virtio_update_irq(vdev); |
| 422 | break; |
| 423 | case VIRTIO_MMIO_STATUS: |
| 424 | if (!(value & VIRTIO_CONFIG_S_DRIVER_OK)) { |
| 425 | virtio_mmio_stop_ioeventfd(proxy); |
| 426 | } |
| 427 | |
| 428 | if (!proxy->legacy && (value & VIRTIO_CONFIG_S_FEATURES_OK)) { |
| 429 | virtio_set_features(vdev, |
| 430 | ((uint64_t)proxy->guest_features[1]) << 32 | |
| 431 | proxy->guest_features[0]); |
| 432 | } |
| 433 | |
| 434 | virtio_set_status(vdev, value & 0xff); |
| 435 | |
| 436 | if (value & VIRTIO_CONFIG_S_DRIVER_OK) { |
| 437 | virtio_mmio_start_ioeventfd(proxy); |
| 438 | } |
| 439 | |
| 440 | if (vdev->status == 0) { |
| 441 | virtio_mmio_soft_reset(proxy); |
| 442 | } |
| 443 | break; |
| 444 | case VIRTIO_MMIO_QUEUE_DESC_LOW: |
| 445 | if (proxy->legacy) { |
| 446 | qemu_log_mask(LOG_GUEST_ERROR, |
| 447 | "%s: write to non-legacy register (0x%" |
| 448 | HWADDR_PRIx ") in legacy mode\n", |
| 449 | __func__, offset); |
| 450 | return; |
| 451 | } |
| 452 | proxy->vqs[vdev->queue_sel].desc[0] = value; |
| 453 | break; |
| 454 | case VIRTIO_MMIO_QUEUE_DESC_HIGH: |
| 455 | if (proxy->legacy) { |
| 456 | qemu_log_mask(LOG_GUEST_ERROR, |
| 457 | "%s: write to non-legacy register (0x%" |
| 458 | HWADDR_PRIx ") in legacy mode\n", |
| 459 | __func__, offset); |
| 460 | return; |
| 461 | } |
| 462 | proxy->vqs[vdev->queue_sel].desc[1] = value; |
| 463 | break; |
| 464 | case VIRTIO_MMIO_QUEUE_AVAIL_LOW: |
| 465 | if (proxy->legacy) { |
| 466 | qemu_log_mask(LOG_GUEST_ERROR, |
| 467 | "%s: write to non-legacy register (0x%" |
| 468 | HWADDR_PRIx ") in legacy mode\n", |
| 469 | __func__, offset); |
| 470 | return; |
| 471 | } |
| 472 | proxy->vqs[vdev->queue_sel].avail[0] = value; |
| 473 | break; |
| 474 | case VIRTIO_MMIO_QUEUE_AVAIL_HIGH: |
| 475 | if (proxy->legacy) { |
| 476 | qemu_log_mask(LOG_GUEST_ERROR, |
| 477 | "%s: write to non-legacy register (0x%" |
| 478 | HWADDR_PRIx ") in legacy mode\n", |
| 479 | __func__, offset); |
| 480 | return; |
| 481 | } |
| 482 | proxy->vqs[vdev->queue_sel].avail[1] = value; |
| 483 | break; |
| 484 | case VIRTIO_MMIO_QUEUE_USED_LOW: |
| 485 | if (proxy->legacy) { |
| 486 | qemu_log_mask(LOG_GUEST_ERROR, |
| 487 | "%s: write to non-legacy register (0x%" |
| 488 | HWADDR_PRIx ") in legacy mode\n", |
| 489 | __func__, offset); |
| 490 | return; |
| 491 | } |
| 492 | proxy->vqs[vdev->queue_sel].used[0] = value; |
| 493 | break; |
| 494 | case VIRTIO_MMIO_QUEUE_USED_HIGH: |
| 495 | if (proxy->legacy) { |
| 496 | qemu_log_mask(LOG_GUEST_ERROR, |
| 497 | "%s: write to non-legacy register (0x%" |
| 498 | HWADDR_PRIx ") in legacy mode\n", |
| 499 | __func__, offset); |
| 500 | return; |
| 501 | } |
| 502 | proxy->vqs[vdev->queue_sel].used[1] = value; |
| 503 | break; |
| 504 | case VIRTIO_MMIO_MAGIC_VALUE: |
| 505 | case VIRTIO_MMIO_VERSION: |
| 506 | case VIRTIO_MMIO_DEVICE_ID: |
| 507 | case VIRTIO_MMIO_VENDOR_ID: |
| 508 | case VIRTIO_MMIO_DEVICE_FEATURES: |
| 509 | case VIRTIO_MMIO_QUEUE_NUM_MAX: |
| 510 | case VIRTIO_MMIO_INTERRUPT_STATUS: |
| 511 | case VIRTIO_MMIO_CONFIG_GENERATION: |
| 512 | qemu_log_mask(LOG_GUEST_ERROR, |
| 513 | "%s: write to read-only register (0x%" HWADDR_PRIx ")\n", |
| 514 | __func__, offset); |
| 515 | break; |
| 516 | |
| 517 | default: |
| 518 | qemu_log_mask(LOG_GUEST_ERROR, |
| 519 | "%s: bad register offset (0x%" HWADDR_PRIx ")\n", |
| 520 | __func__, offset); |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | static const MemoryRegionOps virtio_legacy_mem_ops = { |
| 525 | .read = virtio_mmio_read, |
| 526 | .write = virtio_mmio_write, |
| 527 | .endianness = DEVICE_NATIVE_ENDIAN, |
| 528 | }; |
| 529 | |
| 530 | static const MemoryRegionOps virtio_mem_ops = { |
| 531 | .read = virtio_mmio_read, |
| 532 | .write = virtio_mmio_write, |
| 533 | .endianness = DEVICE_LITTLE_ENDIAN, |
| 534 | }; |
| 535 | |
| 536 | static void virtio_mmio_update_irq(DeviceState *opaque, uint16_t vector) |
| 537 | { |
| 538 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| 539 | VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| 540 | int level; |
| 541 | |
| 542 | if (!vdev) { |
| 543 | return; |
| 544 | } |
| 545 | level = (qatomic_read(&vdev->isr) != 0); |
| 546 | trace_virtio_mmio_setting_irq(level); |
| 547 | qemu_set_irq(proxy->irq, level); |
| 548 | } |
| 549 | |
| 550 | static int virtio_mmio_load_config(DeviceState *opaque, QEMUFile *f) |
| 551 | { |
| 552 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| 553 | |
| 554 | proxy->host_features_sel = qemu_get_be32(f); |
| 555 | proxy->guest_features_sel = qemu_get_be32(f); |
| 556 | proxy->guest_page_shift = qemu_get_be32(f); |
| 557 | return 0; |
| 558 | } |
| 559 | |
| 560 | static void virtio_mmio_save_config(DeviceState *opaque, QEMUFile *f) |
| 561 | { |
| 562 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| 563 | |
| 564 | qemu_put_be32(f, proxy->host_features_sel); |
| 565 | qemu_put_be32(f, proxy->guest_features_sel); |
| 566 | qemu_put_be32(f, proxy->guest_page_shift); |
| 567 | } |
| 568 | |
| 569 | static const VMStateDescription vmstate_virtio_mmio_queue_state = { |
| 570 | .name = "virtio_mmio/queue_state", |
| 571 | .version_id = 1, |
| 572 | .minimum_version_id = 1, |
| 573 | .fields = (const VMStateField[]) { |
| 574 | VMSTATE_UINT16(num, VirtIOMMIOQueue), |
| 575 | VMSTATE_BOOL(enabled, VirtIOMMIOQueue), |
| 576 | VMSTATE_UINT32_ARRAY(desc, VirtIOMMIOQueue, 2), |
| 577 | VMSTATE_UINT32_ARRAY(avail, VirtIOMMIOQueue, 2), |
| 578 | VMSTATE_UINT32_ARRAY(used, VirtIOMMIOQueue, 2), |
| 579 | VMSTATE_END_OF_LIST() |
| 580 | } |
| 581 | }; |
| 582 | |
| 583 | static const VMStateDescription vmstate_virtio_mmio_state_sub = { |
| 584 | .name = "virtio_mmio/state", |
| 585 | .version_id = 1, |
| 586 | .minimum_version_id = 1, |
| 587 | .fields = (const VMStateField[]) { |
| 588 | VMSTATE_UINT32_ARRAY(guest_features, VirtIOMMIOProxy, 2), |
| 589 | VMSTATE_STRUCT_ARRAY(vqs, VirtIOMMIOProxy, VIRTIO_QUEUE_MAX, 0, |
| 590 | vmstate_virtio_mmio_queue_state, |
| 591 | VirtIOMMIOQueue), |
| 592 | VMSTATE_END_OF_LIST() |
| 593 | } |
| 594 | }; |
| 595 | |
| 596 | static const VMStateDescription vmstate_virtio_mmio = { |
| 597 | .name = "virtio_mmio", |
| 598 | .version_id = 1, |
| 599 | .minimum_version_id = 1, |
| 600 | .fields = (const VMStateField[]) { |
| 601 | VMSTATE_END_OF_LIST() |
| 602 | }, |
| 603 | .subsections = (const VMStateDescription * const []) { |
| 604 | &vmstate_virtio_mmio_state_sub, |
| 605 | NULL |
| 606 | } |
| 607 | }; |
| 608 | |
| 609 | static void virtio_mmio_save_extra_state(DeviceState *opaque, QEMUFile *f) |
| 610 | { |
| 611 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| 612 | Error *local_err = NULL; |
| 613 | int ret; |
| 614 | |
| 615 | ret = vmstate_save_state(f, &vmstate_virtio_mmio, proxy, NULL, &local_err); |
| 616 | if (ret < 0) { |
| 617 | error_report_err(local_err); |
| 618 | } |
| 619 | } |
| 620 | |
| 621 | static int virtio_mmio_load_extra_state(DeviceState *opaque, QEMUFile *f) |
| 622 | { |
| 623 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| 624 | Error *local_err = NULL; |
| 625 | int ret; |
| 626 | |
| 627 | ret = vmstate_load_state(f, &vmstate_virtio_mmio, proxy, 1, &local_err); |
| 628 | if (ret < 0) { |
| 629 | error_report_err(local_err); |
| 630 | } |
| 631 | return ret; |
| 632 | } |
| 633 | |
| 634 | static bool virtio_mmio_has_extra_state(DeviceState *opaque) |
| 635 | { |
| 636 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(opaque); |
| 637 | |
| 638 | return !proxy->legacy; |
| 639 | } |
| 640 | |
| 641 | static void virtio_mmio_reset(DeviceState *d) |
| 642 | { |
| 643 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| 644 | int i; |
| 645 | |
| 646 | virtio_mmio_soft_reset(proxy); |
| 647 | |
| 648 | proxy->host_features_sel = 0; |
| 649 | proxy->guest_features_sel = 0; |
| 650 | proxy->guest_page_shift = 0; |
| 651 | |
| 652 | if (!proxy->legacy) { |
| 653 | proxy->guest_features[0] = proxy->guest_features[1] = 0; |
| 654 | |
| 655 | for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { |
| 656 | proxy->vqs[i].num = 0; |
| 657 | proxy->vqs[i].desc[0] = proxy->vqs[i].desc[1] = 0; |
| 658 | proxy->vqs[i].avail[0] = proxy->vqs[i].avail[1] = 0; |
| 659 | proxy->vqs[i].used[0] = proxy->vqs[i].used[1] = 0; |
| 660 | } |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign, |
| 665 | bool with_irqfd) |
| 666 | { |
| 667 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| 668 | VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| 669 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); |
| 670 | int r; |
| 671 | |
| 672 | r = virtio_set_guest_notifier(vdev, n, assign, with_irqfd); |
| 673 | if (r < 0) { |
| 674 | return r; |
| 675 | } |
| 676 | |
| 677 | if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) { |
| 678 | vdc->guest_notifier_mask(vdev, n, !assign); |
| 679 | } |
| 680 | |
| 681 | return 0; |
| 682 | } |
| 683 | |
| 684 | static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs, |
| 685 | bool assign) |
| 686 | { |
| 687 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| 688 | VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| 689 | /* TODO: need to check if kvm-arm supports irqfd */ |
| 690 | bool with_irqfd = false; |
| 691 | int r, n; |
| 692 | |
| 693 | nvqs = MIN(nvqs, VIRTIO_QUEUE_MAX); |
| 694 | |
| 695 | for (n = 0; n < nvqs; n++) { |
| 696 | if (!virtio_queue_get_num(vdev, n)) { |
| 697 | break; |
| 698 | } |
| 699 | |
| 700 | r = virtio_mmio_set_guest_notifier(d, n, assign, with_irqfd); |
| 701 | if (r < 0) { |
| 702 | goto assign_error; |
| 703 | } |
| 704 | } |
| 705 | r = virtio_mmio_set_guest_notifier(d, VIRTIO_CONFIG_IRQ_IDX, assign, |
| 706 | with_irqfd); |
| 707 | if (r < 0) { |
| 708 | goto assign_error; |
| 709 | } |
| 710 | |
| 711 | return 0; |
| 712 | |
| 713 | assign_error: |
| 714 | /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */ |
| 715 | assert(assign); |
| 716 | while (--n >= 0) { |
| 717 | virtio_mmio_set_guest_notifier(d, n, !assign, false); |
| 718 | } |
| 719 | return r; |
| 720 | } |
| 721 | |
| 722 | static void virtio_mmio_pre_plugged(DeviceState *d, Error **errp) |
| 723 | { |
| 724 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| 725 | VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus); |
| 726 | |
| 727 | if (!proxy->legacy) { |
| 728 | virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); |
| 729 | } |
| 730 | } |
| 731 | |
| 732 | /* virtio-mmio device */ |
| 733 | |
| 734 | static const Property virtio_mmio_properties[] = { |
| 735 | DEFINE_PROP_BOOL("force-legacy", VirtIOMMIOProxy, legacy, true), |
| 736 | DEFINE_PROP_BIT("ioeventfd", VirtIOMMIOProxy, flags, |
| 737 | VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD_BIT, true), |
| 738 | DEFINE_PROP_UINT16(VIRTIO_QUEUE_SIZE_OVERRIDE, VirtIOMMIOProxy, |
| 739 | override_queue_size, 0), |
| 740 | }; |
| 741 | |
| 742 | static void virtio_mmio_realizefn(DeviceState *d, Error **errp) |
| 743 | { |
| 744 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| 745 | SysBusDevice *sbd = SYS_BUS_DEVICE(d); |
| 746 | |
| 747 | qbus_init(&proxy->bus, sizeof(proxy->bus), TYPE_VIRTIO_MMIO_BUS, d, NULL); |
| 748 | sysbus_init_irq(sbd, &proxy->irq); |
| 749 | |
| 750 | /* fd-based ioevents can't be synchronized in record/replay */ |
| 751 | if (replay_mode != REPLAY_MODE_NONE) { |
| 752 | proxy->flags &= ~VIRTIO_IOMMIO_FLAG_USE_IOEVENTFD; |
| 753 | } |
| 754 | |
| 755 | if (proxy->legacy) { |
| 756 | memory_region_init_io(&proxy->iomem, OBJECT(d), |
| 757 | &virtio_legacy_mem_ops, proxy, |
| 758 | TYPE_VIRTIO_MMIO, 0x200); |
| 759 | } else { |
| 760 | memory_region_init_io(&proxy->iomem, OBJECT(d), |
| 761 | &virtio_mem_ops, proxy, |
| 762 | TYPE_VIRTIO_MMIO, 0x200); |
| 763 | } |
| 764 | sysbus_init_mmio(sbd, &proxy->iomem); |
| 765 | } |
| 766 | |
| 767 | static void virtio_mmio_class_init(ObjectClass *klass, const void *data) |
| 768 | { |
| 769 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 770 | |
| 771 | dc->realize = virtio_mmio_realizefn; |
| 772 | device_class_set_legacy_reset(dc, virtio_mmio_reset); |
| 773 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
| 774 | device_class_set_props(dc, virtio_mmio_properties); |
| 775 | } |
| 776 | |
| 777 | static const TypeInfo virtio_mmio_info = { |
| 778 | .name = TYPE_VIRTIO_MMIO, |
| 779 | .parent = TYPE_SYS_BUS_DEVICE, |
| 780 | .instance_size = sizeof(VirtIOMMIOProxy), |
| 781 | .class_init = virtio_mmio_class_init, |
| 782 | }; |
| 783 | |
| 784 | /* virtio-mmio-bus. */ |
| 785 | |
| 786 | static char *virtio_mmio_bus_get_dev_path(DeviceState *dev) |
| 787 | { |
| 788 | BusState *virtio_mmio_bus; |
| 789 | VirtIOMMIOProxy *virtio_mmio_proxy; |
| 790 | char *proxy_path; |
| 791 | char *path; |
| 792 | MemoryRegionSection section; |
| 793 | |
| 794 | virtio_mmio_bus = qdev_get_parent_bus(dev); |
| 795 | virtio_mmio_proxy = VIRTIO_MMIO(virtio_mmio_bus->parent); |
| 796 | proxy_path = qdev_get_dev_path(DEVICE(virtio_mmio_proxy)); |
| 797 | |
| 798 | section = memory_region_find(&virtio_mmio_proxy->iomem, 0, 0x200); |
| 799 | assert(section.mr); |
| 800 | |
| 801 | if (proxy_path) { |
| 802 | path = g_strdup_printf("%s/virtio-mmio@" HWADDR_FMT_plx, proxy_path, |
| 803 | section.offset_within_address_space); |
| 804 | } else { |
| 805 | path = g_strdup_printf("virtio-mmio@" HWADDR_FMT_plx, |
| 806 | section.offset_within_address_space); |
| 807 | } |
| 808 | memory_region_unref(section.mr); |
| 809 | |
| 810 | g_free(proxy_path); |
| 811 | return path; |
| 812 | } |
| 813 | |
| 814 | static void virtio_mmio_vmstate_change(DeviceState *d, bool running) |
| 815 | { |
| 816 | VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d); |
| 817 | |
| 818 | if (running) { |
| 819 | virtio_mmio_start_ioeventfd(proxy); |
| 820 | } else { |
| 821 | virtio_mmio_stop_ioeventfd(proxy); |
| 822 | } |
| 823 | } |
| 824 | |
| 825 | static void virtio_mmio_bus_class_init(ObjectClass *klass, const void *data) |
| 826 | { |
| 827 | BusClass *bus_class = BUS_CLASS(klass); |
| 828 | VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); |
| 829 | |
| 830 | k->notify = virtio_mmio_update_irq; |
| 831 | k->save_config = virtio_mmio_save_config; |
| 832 | k->load_config = virtio_mmio_load_config; |
| 833 | k->save_extra_state = virtio_mmio_save_extra_state; |
| 834 | k->load_extra_state = virtio_mmio_load_extra_state; |
| 835 | k->has_extra_state = virtio_mmio_has_extra_state; |
| 836 | k->set_guest_notifiers = virtio_mmio_set_guest_notifiers; |
| 837 | k->ioeventfd_enabled = virtio_mmio_ioeventfd_enabled; |
| 838 | k->ioeventfd_assign = virtio_mmio_ioeventfd_assign; |
| 839 | k->pre_plugged = virtio_mmio_pre_plugged; |
| 840 | k->vmstate_change = virtio_mmio_vmstate_change; |
| 841 | k->has_variable_vring_alignment = true; |
| 842 | bus_class->max_dev = 1; |
| 843 | bus_class->get_dev_path = virtio_mmio_bus_get_dev_path; |
| 844 | } |
| 845 | |
| 846 | static const TypeInfo virtio_mmio_bus_info = { |
| 847 | .name = TYPE_VIRTIO_MMIO_BUS, |
| 848 | .parent = TYPE_VIRTIO_BUS, |
| 849 | .instance_size = sizeof(VirtioBusState), |
| 850 | .class_init = virtio_mmio_bus_class_init, |
| 851 | }; |
| 852 | |
| 853 | static void virtio_mmio_register_types(void) |
| 854 | { |
| 855 | type_register_static(&virtio_mmio_bus_info); |
| 856 | type_register_static(&virtio_mmio_info); |
| 857 | } |
| 858 | |
| 859 | type_init(virtio_mmio_register_types) |