| 1 | /* |
| 2 | * A bus for connecting virtio serial and console ports |
| 3 | * |
| 4 | * Copyright (C) 2009, 2010 Red Hat, Inc. |
| 5 | * |
| 6 | * Author(s): |
| 7 | * Amit Shah <amit.shah@redhat.com> |
| 8 | * |
| 9 | * Some earlier parts are: |
| 10 | * Copyright IBM, Corp. 2008 |
| 11 | * authored by |
| 12 | * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com> |
| 13 | * |
| 14 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 15 | * the COPYING file in the top-level directory. |
| 16 | * |
| 17 | * Contributions after 2012-01-13 are licensed under the terms of the |
| 18 | * GNU GPL, version 2 or (at your option) any later version. |
| 19 | */ |
| 20 | |
| 21 | #include "qemu/osdep.h" |
| 22 | #include "qapi/error.h" |
| 23 | #include "qemu/iov.h" |
| 24 | #include "qemu/main-loop.h" |
| 25 | #include "qemu/module.h" |
| 26 | #include "migration/qemu-file-types.h" |
| 27 | #include "monitor/monitor.h" |
| 28 | #include "monitor/hmp.h" |
| 29 | #include "qemu/error-report.h" |
| 30 | #include "qemu/queue.h" |
| 31 | #include "hw/core/qdev-properties.h" |
| 32 | #include "trace.h" |
| 33 | #include "hw/virtio/virtio-serial.h" |
| 34 | #include "hw/virtio/virtio-access.h" |
| 35 | |
| 36 | static struct VirtIOSerialDevices { |
| 37 | QLIST_HEAD(, VirtIOSerial) devices; |
| 38 | } vserdevices; |
| 39 | |
| 40 | static VirtIOSerialPort *find_port_by_id(VirtIOSerial *vser, uint32_t id) |
| 41 | { |
| 42 | VirtIOSerialPort *port; |
| 43 | |
| 44 | if (id == VIRTIO_CONSOLE_BAD_ID) { |
| 45 | return NULL; |
| 46 | } |
| 47 | |
| 48 | QTAILQ_FOREACH(port, &vser->ports, next) { |
| 49 | if (port->id == id) |
| 50 | return port; |
| 51 | } |
| 52 | return NULL; |
| 53 | } |
| 54 | |
| 55 | static VirtIOSerialPort *find_port_by_vq(VirtIOSerial *vser, VirtQueue *vq) |
| 56 | { |
| 57 | VirtIOSerialPort *port; |
| 58 | |
| 59 | QTAILQ_FOREACH(port, &vser->ports, next) { |
| 60 | if (port->ivq == vq || port->ovq == vq) |
| 61 | return port; |
| 62 | } |
| 63 | return NULL; |
| 64 | } |
| 65 | |
| 66 | static VirtIOSerialPort *find_port_by_name(char *name) |
| 67 | { |
| 68 | VirtIOSerial *vser; |
| 69 | |
| 70 | QLIST_FOREACH(vser, &vserdevices.devices, next) { |
| 71 | VirtIOSerialPort *port; |
| 72 | |
| 73 | QTAILQ_FOREACH(port, &vser->ports, next) { |
| 74 | if (port->name && !strcmp(port->name, name)) { |
| 75 | return port; |
| 76 | } |
| 77 | } |
| 78 | } |
| 79 | return NULL; |
| 80 | } |
| 81 | |
| 82 | static VirtIOSerialPort *find_first_connected_console(VirtIOSerial *vser) |
| 83 | { |
| 84 | VirtIOSerialPort *port; |
| 85 | |
| 86 | QTAILQ_FOREACH(port, &vser->ports, next) { |
| 87 | VirtIOSerialPortClass const *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 88 | if (vsc->is_console && port->host_connected) { |
| 89 | return port; |
| 90 | } |
| 91 | } |
| 92 | return NULL; |
| 93 | } |
| 94 | |
| 95 | static bool use_multiport(VirtIOSerial *vser) |
| 96 | { |
| 97 | VirtIODevice *vdev = VIRTIO_DEVICE(vser); |
| 98 | return virtio_vdev_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT); |
| 99 | } |
| 100 | |
| 101 | static size_t write_to_port(VirtIOSerialPort *port, |
| 102 | const uint8_t *buf, size_t size) |
| 103 | { |
| 104 | VirtQueueElement *elem; |
| 105 | VirtQueue *vq; |
| 106 | size_t offset; |
| 107 | |
| 108 | vq = port->ivq; |
| 109 | if (!virtio_queue_ready(vq)) { |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | offset = 0; |
| 114 | while (offset < size) { |
| 115 | size_t len; |
| 116 | |
| 117 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); |
| 118 | if (!elem) { |
| 119 | break; |
| 120 | } |
| 121 | |
| 122 | len = iov_from_buf(elem->in_sg, elem->in_num, 0, |
| 123 | buf + offset, size - offset); |
| 124 | offset += len; |
| 125 | |
| 126 | virtqueue_push(vq, elem, len); |
| 127 | g_free(elem); |
| 128 | } |
| 129 | |
| 130 | virtio_notify(VIRTIO_DEVICE(port->vser), vq); |
| 131 | return offset; |
| 132 | } |
| 133 | |
| 134 | static void discard_vq_data(VirtQueue *vq, VirtIODevice *vdev) |
| 135 | { |
| 136 | VirtQueueElement *elem; |
| 137 | |
| 138 | if (!virtio_queue_ready(vq)) { |
| 139 | return; |
| 140 | } |
| 141 | for (;;) { |
| 142 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); |
| 143 | if (!elem) { |
| 144 | break; |
| 145 | } |
| 146 | virtqueue_push(vq, elem, 0); |
| 147 | g_free(elem); |
| 148 | } |
| 149 | virtio_notify(vdev, vq); |
| 150 | } |
| 151 | |
| 152 | static void discard_throttle_data(VirtIOSerialPort *port) |
| 153 | { |
| 154 | if (port->elem) { |
| 155 | virtqueue_detach_element(port->ovq, port->elem, 0); |
| 156 | g_free(port->elem); |
| 157 | port->elem = NULL; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | static void do_flush_queued_data(VirtIOSerialPort *port, VirtQueue *vq, |
| 162 | VirtIODevice *vdev) |
| 163 | { |
| 164 | VirtIOSerialPortClass *vsc; |
| 165 | |
| 166 | assert(port); |
| 167 | assert(virtio_queue_ready(vq)); |
| 168 | |
| 169 | vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 170 | |
| 171 | while (!port->throttled) { |
| 172 | unsigned int i; |
| 173 | |
| 174 | /* Pop an elem only if we haven't left off a previous one mid-way */ |
| 175 | if (!port->elem) { |
| 176 | port->elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); |
| 177 | if (!port->elem) { |
| 178 | break; |
| 179 | } |
| 180 | port->iov_idx = 0; |
| 181 | port->iov_offset = 0; |
| 182 | } |
| 183 | |
| 184 | for (i = port->iov_idx; i < port->elem->out_num; i++) { |
| 185 | size_t buf_size; |
| 186 | ssize_t ret; |
| 187 | |
| 188 | buf_size = port->elem->out_sg[i].iov_len - port->iov_offset; |
| 189 | ret = vsc->have_data(port, |
| 190 | port->elem->out_sg[i].iov_base |
| 191 | + port->iov_offset, |
| 192 | buf_size); |
| 193 | if (!port->elem) { /* bail if we got disconnected */ |
| 194 | return; |
| 195 | } |
| 196 | if (port->throttled) { |
| 197 | port->iov_idx = i; |
| 198 | if (ret > 0) { |
| 199 | port->iov_offset += ret; |
| 200 | } |
| 201 | break; |
| 202 | } |
| 203 | port->iov_offset = 0; |
| 204 | } |
| 205 | if (port->throttled) { |
| 206 | break; |
| 207 | } |
| 208 | virtqueue_push(vq, port->elem, 0); |
| 209 | g_free(port->elem); |
| 210 | port->elem = NULL; |
| 211 | } |
| 212 | virtio_notify(vdev, vq); |
| 213 | } |
| 214 | |
| 215 | static void flush_queued_data(VirtIOSerialPort *port) |
| 216 | { |
| 217 | assert(port); |
| 218 | |
| 219 | if (!virtio_queue_ready(port->ovq)) { |
| 220 | return; |
| 221 | } |
| 222 | do_flush_queued_data(port, port->ovq, VIRTIO_DEVICE(port->vser)); |
| 223 | } |
| 224 | |
| 225 | static size_t send_control_msg(VirtIOSerial *vser, void *buf, size_t len) |
| 226 | { |
| 227 | VirtQueueElement *elem; |
| 228 | VirtQueue *vq; |
| 229 | |
| 230 | vq = vser->c_ivq; |
| 231 | if (!virtio_queue_ready(vq)) { |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); |
| 236 | if (!elem) { |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | /* TODO: detect a buffer that's too short, set NEEDS_RESET */ |
| 241 | iov_from_buf(elem->in_sg, elem->in_num, 0, buf, len); |
| 242 | |
| 243 | virtqueue_push(vq, elem, len); |
| 244 | virtio_notify(VIRTIO_DEVICE(vser), vq); |
| 245 | g_free(elem); |
| 246 | |
| 247 | return len; |
| 248 | } |
| 249 | |
| 250 | static size_t send_control_event(VirtIOSerial *vser, uint32_t port_id, |
| 251 | uint16_t event, uint16_t value) |
| 252 | { |
| 253 | VirtIODevice *vdev = VIRTIO_DEVICE(vser); |
| 254 | struct virtio_console_control cpkt; |
| 255 | |
| 256 | virtio_stl_p(vdev, &cpkt.id, port_id); |
| 257 | virtio_stw_p(vdev, &cpkt.event, event); |
| 258 | virtio_stw_p(vdev, &cpkt.value, value); |
| 259 | |
| 260 | trace_virtio_serial_send_control_event(port_id, event, value); |
| 261 | return send_control_msg(vser, &cpkt, sizeof(cpkt)); |
| 262 | } |
| 263 | |
| 264 | /* Functions for use inside qemu to open and read from/write to ports */ |
| 265 | int virtio_serial_open(VirtIOSerialPort *port) |
| 266 | { |
| 267 | /* Don't allow opening an already-open port */ |
| 268 | if (port->host_connected) { |
| 269 | return 0; |
| 270 | } |
| 271 | /* Send port open notification to the guest */ |
| 272 | port->host_connected = true; |
| 273 | send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1); |
| 274 | |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | int virtio_serial_close(VirtIOSerialPort *port) |
| 279 | { |
| 280 | port->host_connected = false; |
| 281 | /* |
| 282 | * If there's any data the guest sent which the app didn't |
| 283 | * consume, reset the throttling flag and discard the data. |
| 284 | */ |
| 285 | port->throttled = false; |
| 286 | discard_throttle_data(port); |
| 287 | discard_vq_data(port->ovq, VIRTIO_DEVICE(port->vser)); |
| 288 | |
| 289 | send_control_event(port->vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 0); |
| 290 | |
| 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | /* Individual ports/apps call this function to write to the guest. */ |
| 295 | ssize_t virtio_serial_write(VirtIOSerialPort *port, const uint8_t *buf, |
| 296 | size_t size) |
| 297 | { |
| 298 | if (!port || !port->host_connected || !port->guest_connected) { |
| 299 | return 0; |
| 300 | } |
| 301 | return write_to_port(port, buf, size); |
| 302 | } |
| 303 | |
| 304 | /* |
| 305 | * Readiness of the guest to accept data on a port. |
| 306 | * Returns max. data the guest can receive |
| 307 | */ |
| 308 | size_t virtio_serial_guest_ready(VirtIOSerialPort *port) |
| 309 | { |
| 310 | VirtIODevice *vdev = VIRTIO_DEVICE(port->vser); |
| 311 | VirtQueue *vq = port->ivq; |
| 312 | unsigned int bytes; |
| 313 | |
| 314 | if (!virtio_queue_ready(vq) || |
| 315 | !(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) || |
| 316 | virtio_queue_empty(vq)) { |
| 317 | return 0; |
| 318 | } |
| 319 | if (use_multiport(port->vser) && !port->guest_connected) { |
| 320 | return 0; |
| 321 | } |
| 322 | virtqueue_get_avail_bytes(vq, &bytes, NULL, 4096, 0); |
| 323 | return bytes; |
| 324 | } |
| 325 | |
| 326 | static void flush_queued_data_bh(void *opaque) |
| 327 | { |
| 328 | VirtIOSerialPort *port = opaque; |
| 329 | |
| 330 | flush_queued_data(port); |
| 331 | } |
| 332 | |
| 333 | void virtio_serial_throttle_port(VirtIOSerialPort *port, bool throttle) |
| 334 | { |
| 335 | if (!port) { |
| 336 | return; |
| 337 | } |
| 338 | |
| 339 | trace_virtio_serial_throttle_port(port->id, throttle); |
| 340 | port->throttled = throttle; |
| 341 | if (throttle) { |
| 342 | return; |
| 343 | } |
| 344 | qemu_bh_schedule(port->bh); |
| 345 | } |
| 346 | |
| 347 | /* Guest wants to notify us of some event */ |
| 348 | static void handle_control_message(VirtIOSerial *vser, |
| 349 | struct virtio_console_control *gcpkt) |
| 350 | { |
| 351 | VirtIODevice *vdev = VIRTIO_DEVICE(vser); |
| 352 | struct VirtIOSerialPort *port; |
| 353 | VirtIOSerialPortClass *vsc; |
| 354 | struct virtio_console_control cpkt; |
| 355 | uint8_t *buffer; |
| 356 | size_t buffer_len; |
| 357 | |
| 358 | cpkt.event = virtio_lduw_p(vdev, &gcpkt->event); |
| 359 | cpkt.value = virtio_lduw_p(vdev, &gcpkt->value); |
| 360 | |
| 361 | trace_virtio_serial_handle_control_message(cpkt.event, cpkt.value); |
| 362 | |
| 363 | if (cpkt.event == VIRTIO_CONSOLE_DEVICE_READY) { |
| 364 | if (!cpkt.value) { |
| 365 | error_report("virtio-serial-bus: Guest failure in adding device %s", |
| 366 | vser->bus.qbus.name); |
| 367 | return; |
| 368 | } |
| 369 | /* |
| 370 | * The device is up, we can now tell the device about all the |
| 371 | * ports we have here. |
| 372 | */ |
| 373 | QTAILQ_FOREACH(port, &vser->ports, next) { |
| 374 | send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_ADD, 1); |
| 375 | } |
| 376 | return; |
| 377 | } |
| 378 | |
| 379 | port = find_port_by_id(vser, virtio_ldl_p(vdev, &gcpkt->id)); |
| 380 | if (!port) { |
| 381 | error_report("virtio-serial-bus: Unexpected port id %u for device %s", |
| 382 | virtio_ldl_p(vdev, &gcpkt->id), vser->bus.qbus.name); |
| 383 | return; |
| 384 | } |
| 385 | |
| 386 | trace_virtio_serial_handle_control_message_port(port->id); |
| 387 | |
| 388 | vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 389 | |
| 390 | switch(cpkt.event) { |
| 391 | case VIRTIO_CONSOLE_PORT_READY: |
| 392 | if (!cpkt.value) { |
| 393 | error_report("virtio-serial-bus: Guest failure in adding port %u for device %s", |
| 394 | port->id, vser->bus.qbus.name); |
| 395 | break; |
| 396 | } |
| 397 | /* |
| 398 | * Now that we know the guest asked for the port name, we're |
| 399 | * sure the guest has initialised whatever state is necessary |
| 400 | * for this port. Now's a good time to let the guest know if |
| 401 | * this port is a console port so that the guest can hook it |
| 402 | * up to hvc. |
| 403 | */ |
| 404 | if (vsc->is_console) { |
| 405 | send_control_event(vser, port->id, VIRTIO_CONSOLE_CONSOLE_PORT, 1); |
| 406 | } |
| 407 | |
| 408 | if (port->name) { |
| 409 | virtio_stl_p(vdev, &cpkt.id, port->id); |
| 410 | virtio_stw_p(vdev, &cpkt.event, VIRTIO_CONSOLE_PORT_NAME); |
| 411 | virtio_stw_p(vdev, &cpkt.value, 1); |
| 412 | |
| 413 | buffer_len = sizeof(cpkt) + strlen(port->name) + 1; |
| 414 | buffer = g_malloc(buffer_len); |
| 415 | |
| 416 | memcpy(buffer, &cpkt, sizeof(cpkt)); |
| 417 | memcpy(buffer + sizeof(cpkt), port->name, strlen(port->name)); |
| 418 | buffer[buffer_len - 1] = 0; |
| 419 | |
| 420 | send_control_msg(vser, buffer, buffer_len); |
| 421 | g_free(buffer); |
| 422 | } |
| 423 | |
| 424 | if (port->host_connected) { |
| 425 | send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_OPEN, 1); |
| 426 | } |
| 427 | |
| 428 | /* |
| 429 | * When the guest has asked us for this information it means |
| 430 | * the guest is all setup and has its virtqueues |
| 431 | * initialised. If some app is interested in knowing about |
| 432 | * this event, let it know. |
| 433 | */ |
| 434 | if (vsc->guest_ready) { |
| 435 | vsc->guest_ready(port); |
| 436 | } |
| 437 | break; |
| 438 | |
| 439 | case VIRTIO_CONSOLE_PORT_OPEN: |
| 440 | port->guest_connected = cpkt.value; |
| 441 | if (vsc->set_guest_connected) { |
| 442 | /* Send the guest opened notification if an app is interested */ |
| 443 | vsc->set_guest_connected(port, cpkt.value); |
| 444 | } |
| 445 | break; |
| 446 | } |
| 447 | } |
| 448 | |
| 449 | static void control_in(VirtIODevice *vdev, VirtQueue *vq) |
| 450 | { |
| 451 | } |
| 452 | |
| 453 | static void control_out(VirtIODevice *vdev, VirtQueue *vq) |
| 454 | { |
| 455 | struct virtio_console_control cpkt; |
| 456 | VirtQueueElement *elem; |
| 457 | VirtIOSerial *vser; |
| 458 | size_t len; |
| 459 | |
| 460 | vser = VIRTIO_SERIAL(vdev); |
| 461 | |
| 462 | for (;;) { |
| 463 | elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); |
| 464 | if (!elem) { |
| 465 | break; |
| 466 | } |
| 467 | |
| 468 | len = iov_to_buf(elem->out_sg, elem->out_num, 0, &cpkt, sizeof(cpkt)); |
| 469 | if (len == sizeof(cpkt)) { |
| 470 | handle_control_message(vser, &cpkt); |
| 471 | } |
| 472 | |
| 473 | virtqueue_push(vq, elem, 0); |
| 474 | g_free(elem); |
| 475 | } |
| 476 | virtio_notify(vdev, vq); |
| 477 | } |
| 478 | |
| 479 | /* Guest wrote something to some port. */ |
| 480 | static void handle_output(VirtIODevice *vdev, VirtQueue *vq) |
| 481 | { |
| 482 | VirtIOSerial *vser; |
| 483 | VirtIOSerialPort *port; |
| 484 | |
| 485 | vser = VIRTIO_SERIAL(vdev); |
| 486 | port = find_port_by_vq(vser, vq); |
| 487 | |
| 488 | if (!port || !port->host_connected) { |
| 489 | discard_vq_data(vq, vdev); |
| 490 | return; |
| 491 | } |
| 492 | |
| 493 | if (!port->throttled) { |
| 494 | do_flush_queued_data(port, vq, vdev); |
| 495 | return; |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | static void handle_input(VirtIODevice *vdev, VirtQueue *vq) |
| 500 | { |
| 501 | /* |
| 502 | * Users of virtio-serial would like to know when guest becomes |
| 503 | * writable again -- i.e. if a vq had stuff queued up and the |
| 504 | * guest wasn't reading at all, the host would not be able to |
| 505 | * write to the vq anymore. Once the guest reads off something, |
| 506 | * we can start queueing things up again. However, this call is |
| 507 | * made for each buffer addition by the guest -- even though free |
| 508 | * buffers existed prior to the current buffer addition. This is |
| 509 | * done so as not to maintain previous state, which will need |
| 510 | * additional live-migration-related changes. |
| 511 | */ |
| 512 | VirtIOSerial *vser; |
| 513 | VirtIOSerialPort *port; |
| 514 | VirtIOSerialPortClass *vsc; |
| 515 | |
| 516 | vser = VIRTIO_SERIAL(vdev); |
| 517 | port = find_port_by_vq(vser, vq); |
| 518 | |
| 519 | if (!port) { |
| 520 | return; |
| 521 | } |
| 522 | vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 523 | |
| 524 | /* |
| 525 | * If guest_connected is false, this call is being made by the |
| 526 | * early-boot queueing up of descriptors, which is just noise for |
| 527 | * the host apps -- don't disturb them in that case. |
| 528 | */ |
| 529 | if (port->guest_connected && port->host_connected && vsc->guest_writable) { |
| 530 | vsc->guest_writable(port); |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | static uint64_t get_features(VirtIODevice *vdev, uint64_t features, |
| 535 | Error **errp) |
| 536 | { |
| 537 | VirtIOSerial *vser; |
| 538 | |
| 539 | vser = VIRTIO_SERIAL(vdev); |
| 540 | |
| 541 | features |= BIT_ULL(VIRTIO_CONSOLE_F_EMERG_WRITE); |
| 542 | if (vser->bus.max_nr_ports > 1) { |
| 543 | virtio_add_feature(&features, VIRTIO_CONSOLE_F_MULTIPORT); |
| 544 | } |
| 545 | return features; |
| 546 | } |
| 547 | |
| 548 | /* Guest requested config info */ |
| 549 | static void get_config(VirtIODevice *vdev, uint8_t *config_data) |
| 550 | { |
| 551 | VirtIOSerial *vser = VIRTIO_SERIAL(vdev); |
| 552 | struct virtio_console_config *config = |
| 553 | (struct virtio_console_config *)config_data; |
| 554 | |
| 555 | config->cols = 0; |
| 556 | config->rows = 0; |
| 557 | config->max_nr_ports = virtio_tswap32(vdev, |
| 558 | vser->serial.max_virtserial_ports); |
| 559 | } |
| 560 | |
| 561 | /* Guest sent new config info */ |
| 562 | static void set_config(VirtIODevice *vdev, const uint8_t *config_data) |
| 563 | { |
| 564 | VirtIOSerial *vser = VIRTIO_SERIAL(vdev); |
| 565 | struct virtio_console_config *config = |
| 566 | (struct virtio_console_config *)config_data; |
| 567 | VirtIOSerialPort *port = find_first_connected_console(vser); |
| 568 | VirtIOSerialPortClass *vsc; |
| 569 | uint8_t emerg_wr_lo; |
| 570 | |
| 571 | if (!config->emerg_wr) { |
| 572 | return; |
| 573 | } |
| 574 | |
| 575 | emerg_wr_lo = le32_to_cpu(config->emerg_wr); |
| 576 | /* Make sure we don't misdetect an emergency write when the guest |
| 577 | * does a short config write after an emergency write. */ |
| 578 | config->emerg_wr = 0; |
| 579 | if (!port) { |
| 580 | return; |
| 581 | } |
| 582 | vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 583 | (void)vsc->have_data(port, &emerg_wr_lo, 1); |
| 584 | } |
| 585 | |
| 586 | static void guest_reset(VirtIOSerial *vser) |
| 587 | { |
| 588 | VirtIOSerialPort *port; |
| 589 | VirtIOSerialPortClass *vsc; |
| 590 | |
| 591 | QTAILQ_FOREACH(port, &vser->ports, next) { |
| 592 | vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 593 | |
| 594 | discard_throttle_data(port); |
| 595 | |
| 596 | if (port->guest_connected) { |
| 597 | port->guest_connected = false; |
| 598 | if (vsc->set_guest_connected) { |
| 599 | vsc->set_guest_connected(port, false); |
| 600 | } |
| 601 | } |
| 602 | } |
| 603 | } |
| 604 | |
| 605 | static int set_status(VirtIODevice *vdev, uint8_t status) |
| 606 | { |
| 607 | VirtIOSerial *vser; |
| 608 | VirtIOSerialPort *port; |
| 609 | |
| 610 | vser = VIRTIO_SERIAL(vdev); |
| 611 | port = find_port_by_id(vser, 0); |
| 612 | |
| 613 | if (port && !use_multiport(port->vser) |
| 614 | && (status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
| 615 | /* |
| 616 | * Non-multiport guests won't be able to tell us guest |
| 617 | * open/close status. Such guests can only have a port at id |
| 618 | * 0, so set guest_connected for such ports as soon as guest |
| 619 | * is up. |
| 620 | */ |
| 621 | port->guest_connected = true; |
| 622 | } |
| 623 | if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
| 624 | guest_reset(vser); |
| 625 | } |
| 626 | |
| 627 | QTAILQ_FOREACH(port, &vser->ports, next) { |
| 628 | VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 629 | if (vsc->enable_backend) { |
| 630 | vsc->enable_backend(port, vdev->vm_running); |
| 631 | } |
| 632 | } |
| 633 | return 0; |
| 634 | } |
| 635 | |
| 636 | static void vser_reset(VirtIODevice *vdev) |
| 637 | { |
| 638 | VirtIOSerial *vser; |
| 639 | |
| 640 | vser = VIRTIO_SERIAL(vdev); |
| 641 | guest_reset(vser); |
| 642 | } |
| 643 | |
| 644 | static void virtio_serial_save_device(VirtIODevice *vdev, QEMUFile *f) |
| 645 | { |
| 646 | VirtIOSerial *s = VIRTIO_SERIAL(vdev); |
| 647 | VirtIOSerialPort *port; |
| 648 | uint32_t nr_active_ports; |
| 649 | unsigned int i, max_nr_ports; |
| 650 | struct virtio_console_config config; |
| 651 | |
| 652 | /* The config space (ignored on the far end in current versions) */ |
| 653 | get_config(vdev, (uint8_t *)&config); |
| 654 | qemu_put_be16(f, config.cols); |
| 655 | qemu_put_be16(f, config.rows); |
| 656 | qemu_put_be32(f, config.max_nr_ports); |
| 657 | |
| 658 | /* The ports map */ |
| 659 | max_nr_ports = s->serial.max_virtserial_ports; |
| 660 | for (i = 0; i < DIV_ROUND_UP(max_nr_ports, 32); i++) { |
| 661 | qemu_put_be32s(f, &s->ports_map[i]); |
| 662 | } |
| 663 | |
| 664 | /* Ports */ |
| 665 | |
| 666 | nr_active_ports = 0; |
| 667 | QTAILQ_FOREACH(port, &s->ports, next) { |
| 668 | nr_active_ports++; |
| 669 | } |
| 670 | |
| 671 | qemu_put_be32s(f, &nr_active_ports); |
| 672 | |
| 673 | /* |
| 674 | * Items in struct VirtIOSerialPort. |
| 675 | */ |
| 676 | QTAILQ_FOREACH(port, &s->ports, next) { |
| 677 | uint32_t elem_popped; |
| 678 | |
| 679 | qemu_put_be32s(f, &port->id); |
| 680 | qemu_put_byte(f, port->guest_connected); |
| 681 | qemu_put_byte(f, port->host_connected); |
| 682 | |
| 683 | elem_popped = 0; |
| 684 | if (port->elem) { |
| 685 | elem_popped = 1; |
| 686 | } |
| 687 | qemu_put_be32s(f, &elem_popped); |
| 688 | if (elem_popped) { |
| 689 | qemu_put_be32s(f, &port->iov_idx); |
| 690 | qemu_put_be64s(f, &port->iov_offset); |
| 691 | qemu_put_virtqueue_element(vdev, f, port->elem); |
| 692 | } |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | static void virtio_serial_post_load_timer_cb(void *opaque) |
| 697 | { |
| 698 | uint32_t i; |
| 699 | VirtIOSerial *s = VIRTIO_SERIAL(opaque); |
| 700 | VirtIOSerialPort *port; |
| 701 | uint8_t host_connected; |
| 702 | VirtIOSerialPortClass *vsc; |
| 703 | |
| 704 | if (!s->post_load) { |
| 705 | return; |
| 706 | } |
| 707 | for (i = 0 ; i < s->post_load->nr_active_ports; ++i) { |
| 708 | port = s->post_load->connected[i].port; |
| 709 | host_connected = s->post_load->connected[i].host_connected; |
| 710 | if (host_connected != port->host_connected) { |
| 711 | /* |
| 712 | * We have to let the guest know of the host connection |
| 713 | * status change |
| 714 | */ |
| 715 | send_control_event(s, port->id, VIRTIO_CONSOLE_PORT_OPEN, |
| 716 | port->host_connected); |
| 717 | } |
| 718 | vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 719 | if (vsc->set_guest_connected) { |
| 720 | vsc->set_guest_connected(port, port->guest_connected); |
| 721 | } |
| 722 | } |
| 723 | g_free(s->post_load->connected); |
| 724 | timer_free(s->post_load->timer); |
| 725 | g_free(s->post_load); |
| 726 | s->post_load = NULL; |
| 727 | } |
| 728 | |
| 729 | static int fetch_active_ports_list(QEMUFile *f, |
| 730 | VirtIOSerial *s, uint32_t nr_active_ports) |
| 731 | { |
| 732 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 733 | uint32_t i; |
| 734 | |
| 735 | s->post_load = g_malloc0(sizeof(*s->post_load)); |
| 736 | s->post_load->nr_active_ports = nr_active_ports; |
| 737 | s->post_load->connected = |
| 738 | g_malloc0(sizeof(*s->post_load->connected) * nr_active_ports); |
| 739 | |
| 740 | s->post_load->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, |
| 741 | virtio_serial_post_load_timer_cb, |
| 742 | s); |
| 743 | |
| 744 | /* Items in struct VirtIOSerialPort */ |
| 745 | for (i = 0; i < nr_active_ports; i++) { |
| 746 | VirtIOSerialPort *port; |
| 747 | uint32_t elem_popped; |
| 748 | uint32_t id; |
| 749 | |
| 750 | id = qemu_get_be32(f); |
| 751 | port = find_port_by_id(s, id); |
| 752 | if (!port) { |
| 753 | return -EINVAL; |
| 754 | } |
| 755 | |
| 756 | port->guest_connected = qemu_get_byte(f); |
| 757 | s->post_load->connected[i].port = port; |
| 758 | s->post_load->connected[i].host_connected = qemu_get_byte(f); |
| 759 | |
| 760 | qemu_get_be32s(f, &elem_popped); |
| 761 | if (elem_popped) { |
| 762 | qemu_get_be32s(f, &port->iov_idx); |
| 763 | qemu_get_be64s(f, &port->iov_offset); |
| 764 | |
| 765 | port->elem = |
| 766 | qemu_get_virtqueue_element(vdev, f, sizeof(VirtQueueElement)); |
| 767 | |
| 768 | /* |
| 769 | * Port was throttled on source machine. Let's |
| 770 | * unthrottle it here so data starts flowing again. |
| 771 | */ |
| 772 | virtio_serial_throttle_port(port, false); |
| 773 | } |
| 774 | } |
| 775 | timer_mod(s->post_load->timer, 1); |
| 776 | return 0; |
| 777 | } |
| 778 | |
| 779 | static int virtio_serial_load_device(VirtIODevice *vdev, QEMUFile *f, |
| 780 | int version_id) |
| 781 | { |
| 782 | VirtIOSerial *s = VIRTIO_SERIAL(vdev); |
| 783 | uint32_t max_nr_ports, nr_active_ports, ports_map; |
| 784 | unsigned int i; |
| 785 | int ret; |
| 786 | uint32_t tmp; |
| 787 | |
| 788 | /* Unused */ |
| 789 | qemu_get_be16s(f, (uint16_t *) &tmp); |
| 790 | qemu_get_be16s(f, (uint16_t *) &tmp); |
| 791 | qemu_get_be32s(f, &tmp); |
| 792 | |
| 793 | max_nr_ports = s->serial.max_virtserial_ports; |
| 794 | for (i = 0; i < DIV_ROUND_UP(max_nr_ports, 32); i++) { |
| 795 | qemu_get_be32s(f, &ports_map); |
| 796 | |
| 797 | if (ports_map != s->ports_map[i]) { |
| 798 | /* |
| 799 | * Ports active on source and destination don't |
| 800 | * match. Fail migration. |
| 801 | */ |
| 802 | return -EINVAL; |
| 803 | } |
| 804 | } |
| 805 | |
| 806 | qemu_get_be32s(f, &nr_active_ports); |
| 807 | |
| 808 | if (nr_active_ports) { |
| 809 | ret = fetch_active_ports_list(f, s, nr_active_ports); |
| 810 | if (ret) { |
| 811 | return ret; |
| 812 | } |
| 813 | } |
| 814 | return 0; |
| 815 | } |
| 816 | |
| 817 | #ifdef CONFIG_HMP |
| 818 | static void virtser_bus_dev_print(MonitorHMP *hmp, DeviceState *qdev, int indent); |
| 819 | #endif |
| 820 | |
| 821 | static const Property virtser_props[] = { |
| 822 | DEFINE_PROP_UINT32("nr", VirtIOSerialPort, id, VIRTIO_CONSOLE_BAD_ID), |
| 823 | DEFINE_PROP_STRING("name", VirtIOSerialPort, name), |
| 824 | }; |
| 825 | |
| 826 | static void virtser_bus_class_init(ObjectClass *klass, const void *data) |
| 827 | { |
| 828 | #ifdef CONFIG_HMP |
| 829 | BusClass *k = BUS_CLASS(klass); |
| 830 | k->print_dev = virtser_bus_dev_print; |
| 831 | #endif |
| 832 | } |
| 833 | |
| 834 | static const TypeInfo virtser_bus_info = { |
| 835 | .name = TYPE_VIRTIO_SERIAL_BUS, |
| 836 | .parent = TYPE_BUS, |
| 837 | .instance_size = sizeof(VirtIOSerialBus), |
| 838 | .class_init = virtser_bus_class_init, |
| 839 | }; |
| 840 | |
| 841 | #ifdef CONFIG_HMP |
| 842 | static void virtser_bus_dev_print(MonitorHMP *hmp, DeviceState *qdev, int indent) |
| 843 | { |
| 844 | VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(qdev); |
| 845 | |
| 846 | monitor_hmp_printf(hmp, "%*sport %d, guest %s, host %s, throttle %s\n", |
| 847 | indent, "", port->id, |
| 848 | port->guest_connected ? "on" : "off", |
| 849 | port->host_connected ? "on" : "off", |
| 850 | port->throttled ? "on" : "off"); |
| 851 | } |
| 852 | #endif |
| 853 | |
| 854 | /* This function is only used if a port id is not provided by the user */ |
| 855 | static uint32_t find_free_port_id(VirtIOSerial *vser) |
| 856 | { |
| 857 | unsigned int i, max_nr_ports; |
| 858 | |
| 859 | max_nr_ports = vser->serial.max_virtserial_ports; |
| 860 | for (i = 0; i < DIV_ROUND_UP(max_nr_ports, 32); i++) { |
| 861 | uint32_t map, zeroes; |
| 862 | |
| 863 | map = vser->ports_map[i]; |
| 864 | zeroes = ctz32(~map); |
| 865 | if (zeroes != 32) { |
| 866 | return zeroes + i * 32; |
| 867 | } |
| 868 | } |
| 869 | return VIRTIO_CONSOLE_BAD_ID; |
| 870 | } |
| 871 | |
| 872 | static void mark_port_added(VirtIOSerial *vser, uint32_t port_id) |
| 873 | { |
| 874 | unsigned int i; |
| 875 | |
| 876 | i = port_id / 32; |
| 877 | vser->ports_map[i] |= 1U << (port_id % 32); |
| 878 | } |
| 879 | |
| 880 | static void add_port(VirtIOSerial *vser, uint32_t port_id) |
| 881 | { |
| 882 | mark_port_added(vser, port_id); |
| 883 | send_control_event(vser, port_id, VIRTIO_CONSOLE_PORT_ADD, 1); |
| 884 | } |
| 885 | |
| 886 | static void remove_port(VirtIOSerial *vser, uint32_t port_id) |
| 887 | { |
| 888 | VirtIOSerialPort *port; |
| 889 | |
| 890 | /* |
| 891 | * Don't mark port 0 removed -- we explicitly reserve it for |
| 892 | * backward compat with older guests, ensure a virtconsole device |
| 893 | * unplug retains the reservation. |
| 894 | */ |
| 895 | if (port_id) { |
| 896 | unsigned int i; |
| 897 | |
| 898 | i = port_id / 32; |
| 899 | vser->ports_map[i] &= ~(1U << (port_id % 32)); |
| 900 | } |
| 901 | |
| 902 | port = find_port_by_id(vser, port_id); |
| 903 | /* |
| 904 | * This function is only called from qdev's unplug callback; if we |
| 905 | * get a NULL port here, we're in trouble. |
| 906 | */ |
| 907 | assert(port); |
| 908 | |
| 909 | /* Flush out any unconsumed buffers first */ |
| 910 | discard_throttle_data(port); |
| 911 | discard_vq_data(port->ovq, VIRTIO_DEVICE(port->vser)); |
| 912 | |
| 913 | send_control_event(vser, port->id, VIRTIO_CONSOLE_PORT_REMOVE, 1); |
| 914 | } |
| 915 | |
| 916 | static void virtser_port_device_realize(DeviceState *dev, Error **errp) |
| 917 | { |
| 918 | VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev); |
| 919 | VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(port); |
| 920 | VirtIOSerialBus *bus = VIRTIO_SERIAL_BUS(qdev_get_parent_bus(dev)); |
| 921 | int max_nr_ports; |
| 922 | bool plugging_port0; |
| 923 | Error *err = NULL; |
| 924 | |
| 925 | port->vser = bus->vser; |
| 926 | |
| 927 | assert(vsc->have_data); |
| 928 | |
| 929 | /* |
| 930 | * Is the first console port we're seeing? If so, put it up at |
| 931 | * location 0. This is done for backward compatibility (old |
| 932 | * kernel, new qemu). |
| 933 | */ |
| 934 | plugging_port0 = vsc->is_console && !find_port_by_id(port->vser, 0); |
| 935 | |
| 936 | if (find_port_by_id(port->vser, port->id)) { |
| 937 | error_setg(errp, "virtio-serial-bus: A port already exists at id %u", |
| 938 | port->id); |
| 939 | return; |
| 940 | } |
| 941 | |
| 942 | if (port->name != NULL && find_port_by_name(port->name)) { |
| 943 | error_setg(errp, "virtio-serial-bus: A port already exists by name %s", |
| 944 | port->name); |
| 945 | return; |
| 946 | } |
| 947 | |
| 948 | if (port->id == VIRTIO_CONSOLE_BAD_ID) { |
| 949 | if (plugging_port0) { |
| 950 | port->id = 0; |
| 951 | } else { |
| 952 | port->id = find_free_port_id(port->vser); |
| 953 | if (port->id == VIRTIO_CONSOLE_BAD_ID) { |
| 954 | error_setg(errp, "virtio-serial-bus: Maximum port limit for " |
| 955 | "this device reached"); |
| 956 | return; |
| 957 | } |
| 958 | } |
| 959 | } |
| 960 | |
| 961 | max_nr_ports = port->vser->serial.max_virtserial_ports; |
| 962 | if (port->id >= max_nr_ports) { |
| 963 | error_setg(errp, "virtio-serial-bus: Out-of-range port id specified, " |
| 964 | "max. allowed: %u", max_nr_ports - 1); |
| 965 | return; |
| 966 | } |
| 967 | |
| 968 | vsc->realize(dev, &err); |
| 969 | if (err != NULL) { |
| 970 | error_propagate(errp, err); |
| 971 | return; |
| 972 | } |
| 973 | |
| 974 | port->bh = virtio_bh_new_guarded(dev, flush_queued_data_bh, port); |
| 975 | port->elem = NULL; |
| 976 | } |
| 977 | |
| 978 | static void virtser_port_device_plug(HotplugHandler *hotplug_dev, |
| 979 | DeviceState *dev, Error **errp) |
| 980 | { |
| 981 | VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev); |
| 982 | |
| 983 | QTAILQ_INSERT_TAIL(&port->vser->ports, port, next); |
| 984 | port->ivq = port->vser->ivqs[port->id]; |
| 985 | port->ovq = port->vser->ovqs[port->id]; |
| 986 | |
| 987 | add_port(port->vser, port->id); |
| 988 | |
| 989 | /* Send an update to the guest about this new port added */ |
| 990 | virtio_notify_config(VIRTIO_DEVICE(hotplug_dev)); |
| 991 | } |
| 992 | |
| 993 | static void virtser_port_device_unrealize(DeviceState *dev) |
| 994 | { |
| 995 | VirtIOSerialPort *port = VIRTIO_SERIAL_PORT(dev); |
| 996 | VirtIOSerialPortClass *vsc = VIRTIO_SERIAL_PORT_GET_CLASS(dev); |
| 997 | VirtIOSerial *vser = port->vser; |
| 998 | |
| 999 | qemu_bh_delete(port->bh); |
| 1000 | remove_port(port->vser, port->id); |
| 1001 | |
| 1002 | QTAILQ_REMOVE(&vser->ports, port, next); |
| 1003 | |
| 1004 | if (vsc->unrealize) { |
| 1005 | vsc->unrealize(dev); |
| 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | static void virtio_serial_device_realize(DeviceState *dev, Error **errp) |
| 1010 | { |
| 1011 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| 1012 | VirtIOSerial *vser = VIRTIO_SERIAL(dev); |
| 1013 | uint32_t i, max_supported_ports; |
| 1014 | size_t config_size = sizeof(struct virtio_console_config); |
| 1015 | |
| 1016 | if (!vser->serial.max_virtserial_ports) { |
| 1017 | error_setg(errp, "Maximum number of serial ports not specified"); |
| 1018 | return; |
| 1019 | } |
| 1020 | |
| 1021 | /* Each port takes 2 queues, and one pair is for the control queue */ |
| 1022 | max_supported_ports = VIRTIO_QUEUE_MAX / 2 - 1; |
| 1023 | |
| 1024 | if (vser->serial.max_virtserial_ports > max_supported_ports) { |
| 1025 | error_setg(errp, "maximum ports supported: %u", max_supported_ports); |
| 1026 | return; |
| 1027 | } |
| 1028 | |
| 1029 | virtio_init(vdev, VIRTIO_ID_CONSOLE, config_size); |
| 1030 | |
| 1031 | /* Spawn a new virtio-serial bus on which the ports will ride as devices */ |
| 1032 | qbus_init(&vser->bus, sizeof(vser->bus), TYPE_VIRTIO_SERIAL_BUS, |
| 1033 | dev, vdev->bus_name); |
| 1034 | qbus_set_hotplug_handler(BUS(&vser->bus), OBJECT(vser)); |
| 1035 | vser->bus.vser = vser; |
| 1036 | QTAILQ_INIT(&vser->ports); |
| 1037 | |
| 1038 | vser->bus.max_nr_ports = vser->serial.max_virtserial_ports; |
| 1039 | vser->ivqs = g_new(VirtQueue *, vser->serial.max_virtserial_ports); |
| 1040 | vser->ovqs = g_new(VirtQueue *, vser->serial.max_virtserial_ports); |
| 1041 | |
| 1042 | /* Add a queue for host to guest transfers for port 0 (backward compat) */ |
| 1043 | vser->ivqs[0] = virtio_add_queue(vdev, 128, handle_input); |
| 1044 | /* Add a queue for guest to host transfers for port 0 (backward compat) */ |
| 1045 | vser->ovqs[0] = virtio_add_queue(vdev, 128, handle_output); |
| 1046 | |
| 1047 | /* TODO: host to guest notifications can get dropped |
| 1048 | * if the queue fills up. Implement queueing in host, |
| 1049 | * this might also make it possible to reduce the control |
| 1050 | * queue size: as guest preposts buffers there, |
| 1051 | * this will save 4Kbyte of guest memory per entry. */ |
| 1052 | |
| 1053 | /* control queue: host to guest */ |
| 1054 | vser->c_ivq = virtio_add_queue(vdev, 32, control_in); |
| 1055 | /* control queue: guest to host */ |
| 1056 | vser->c_ovq = virtio_add_queue(vdev, 32, control_out); |
| 1057 | |
| 1058 | for (i = 1; i < vser->bus.max_nr_ports; i++) { |
| 1059 | /* Add a per-port queue for host to guest transfers */ |
| 1060 | vser->ivqs[i] = virtio_add_queue(vdev, 128, handle_input); |
| 1061 | /* Add a per-per queue for guest to host transfers */ |
| 1062 | vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output); |
| 1063 | } |
| 1064 | |
| 1065 | vser->ports_map = g_malloc0((DIV_ROUND_UP(vser->serial.max_virtserial_ports, 32)) |
| 1066 | * sizeof(vser->ports_map[0])); |
| 1067 | /* |
| 1068 | * Reserve location 0 for a console port for backward compat |
| 1069 | * (old kernel, new qemu) |
| 1070 | */ |
| 1071 | mark_port_added(vser, 0); |
| 1072 | |
| 1073 | vser->post_load = NULL; |
| 1074 | |
| 1075 | QLIST_INSERT_HEAD(&vserdevices.devices, vser, next); |
| 1076 | } |
| 1077 | |
| 1078 | static void virtio_serial_port_class_init(ObjectClass *klass, const void *data) |
| 1079 | { |
| 1080 | DeviceClass *k = DEVICE_CLASS(klass); |
| 1081 | |
| 1082 | set_bit(DEVICE_CATEGORY_INPUT, k->categories); |
| 1083 | k->bus_type = TYPE_VIRTIO_SERIAL_BUS; |
| 1084 | k->realize = virtser_port_device_realize; |
| 1085 | k->unrealize = virtser_port_device_unrealize; |
| 1086 | device_class_set_props(k, virtser_props); |
| 1087 | } |
| 1088 | |
| 1089 | static const TypeInfo virtio_serial_port_type_info = { |
| 1090 | .name = TYPE_VIRTIO_SERIAL_PORT, |
| 1091 | .parent = TYPE_DEVICE, |
| 1092 | .instance_size = sizeof(VirtIOSerialPort), |
| 1093 | .abstract = true, |
| 1094 | .class_size = sizeof(VirtIOSerialPortClass), |
| 1095 | .class_init = virtio_serial_port_class_init, |
| 1096 | }; |
| 1097 | |
| 1098 | static void virtio_serial_device_unrealize(DeviceState *dev) |
| 1099 | { |
| 1100 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| 1101 | VirtIOSerial *vser = VIRTIO_SERIAL(dev); |
| 1102 | int i; |
| 1103 | |
| 1104 | QLIST_REMOVE(vser, next); |
| 1105 | |
| 1106 | virtio_delete_queue(vser->c_ivq); |
| 1107 | virtio_delete_queue(vser->c_ovq); |
| 1108 | for (i = 0; i < vser->bus.max_nr_ports; i++) { |
| 1109 | virtio_delete_queue(vser->ivqs[i]); |
| 1110 | virtio_delete_queue(vser->ovqs[i]); |
| 1111 | } |
| 1112 | |
| 1113 | g_free(vser->ivqs); |
| 1114 | g_free(vser->ovqs); |
| 1115 | g_free(vser->ports_map); |
| 1116 | if (vser->post_load) { |
| 1117 | g_free(vser->post_load->connected); |
| 1118 | timer_free(vser->post_load->timer); |
| 1119 | g_free(vser->post_load); |
| 1120 | } |
| 1121 | |
| 1122 | qbus_set_hotplug_handler(BUS(&vser->bus), NULL); |
| 1123 | |
| 1124 | virtio_cleanup(vdev); |
| 1125 | } |
| 1126 | |
| 1127 | /* Note: 'console' is used for backwards compatibility */ |
| 1128 | static const VMStateDescription vmstate_virtio_console = { |
| 1129 | .name = "virtio-console", |
| 1130 | .minimum_version_id = 3, |
| 1131 | .version_id = 3, |
| 1132 | .fields = (const VMStateField[]) { |
| 1133 | VMSTATE_VIRTIO_DEVICE, |
| 1134 | VMSTATE_END_OF_LIST() |
| 1135 | }, |
| 1136 | }; |
| 1137 | |
| 1138 | static const Property virtio_serial_properties[] = { |
| 1139 | DEFINE_PROP_UINT32("max_ports", VirtIOSerial, serial.max_virtserial_ports, |
| 1140 | 31), |
| 1141 | }; |
| 1142 | |
| 1143 | static void virtio_serial_class_init(ObjectClass *klass, const void *data) |
| 1144 | { |
| 1145 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 1146 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
| 1147 | HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); |
| 1148 | |
| 1149 | QLIST_INIT(&vserdevices.devices); |
| 1150 | |
| 1151 | device_class_set_props(dc, virtio_serial_properties); |
| 1152 | dc->vmsd = &vmstate_virtio_console; |
| 1153 | set_bit(DEVICE_CATEGORY_INPUT, dc->categories); |
| 1154 | vdc->realize = virtio_serial_device_realize; |
| 1155 | vdc->unrealize = virtio_serial_device_unrealize; |
| 1156 | vdc->get_features = get_features; |
| 1157 | vdc->get_config = get_config; |
| 1158 | vdc->set_config = set_config; |
| 1159 | vdc->set_status = set_status; |
| 1160 | vdc->reset = vser_reset; |
| 1161 | vdc->save = virtio_serial_save_device; |
| 1162 | vdc->load = virtio_serial_load_device; |
| 1163 | hc->plug = virtser_port_device_plug; |
| 1164 | hc->unplug = qdev_simple_device_unplug_cb; |
| 1165 | } |
| 1166 | |
| 1167 | static const TypeInfo virtio_device_info = { |
| 1168 | .name = TYPE_VIRTIO_SERIAL, |
| 1169 | .parent = TYPE_VIRTIO_DEVICE, |
| 1170 | .instance_size = sizeof(VirtIOSerial), |
| 1171 | .class_init = virtio_serial_class_init, |
| 1172 | .interfaces = (const InterfaceInfo[]) { |
| 1173 | { TYPE_HOTPLUG_HANDLER }, |
| 1174 | { } |
| 1175 | } |
| 1176 | }; |
| 1177 | |
| 1178 | static void virtio_serial_register_types(void) |
| 1179 | { |
| 1180 | type_register_static(&virtser_bus_info); |
| 1181 | type_register_static(&virtio_serial_port_type_info); |
| 1182 | type_register_static(&virtio_device_info); |
| 1183 | } |
| 1184 | |
| 1185 | type_init(virtio_serial_register_types) |