| 1 | /* |
| 2 | * Copyright (C) International Business Machines Corp., 2005 |
| 3 | * Author(s): Anthony Liguori <aliguori@us.ibm.com> |
| 4 | * |
| 5 | * Copyright (C) Red Hat 2007 |
| 6 | * |
| 7 | * Xen Console |
| 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 as published by |
| 11 | * the Free Software Foundation; under version 2 of the License. |
| 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 "qemu/cutils.h" |
| 24 | #include <sys/select.h> |
| 25 | #include <termios.h> |
| 26 | |
| 27 | #include "qapi/error.h" |
| 28 | #include "system/system.h" |
| 29 | #include "chardev/char-fe.h" |
| 30 | #include "hw/xen/xen-backend.h" |
| 31 | #include "hw/xen/xen-bus-helper.h" |
| 32 | #include "hw/core/qdev-properties.h" |
| 33 | #include "hw/core/qdev-properties-system.h" |
| 34 | #include "hw/xen/interface/io/console.h" |
| 35 | #include "hw/xen/interface/io/xs_wire.h" |
| 36 | #include "hw/xen/interface/grant_table.h" |
| 37 | #include "hw/i386/kvm/xen_primary_console.h" |
| 38 | #include "trace.h" |
| 39 | |
| 40 | struct buffer { |
| 41 | uint8_t *data; |
| 42 | size_t consumed; |
| 43 | size_t size; |
| 44 | size_t capacity; |
| 45 | size_t max_capacity; |
| 46 | }; |
| 47 | |
| 48 | struct XenConsole { |
| 49 | struct XenDevice xendev; /* must be first */ |
| 50 | XenEventChannel *event_channel; |
| 51 | int dev; |
| 52 | struct buffer buffer; |
| 53 | char *fe_path; |
| 54 | unsigned int ring_ref; |
| 55 | void *sring; |
| 56 | CharFrontend chr; |
| 57 | int backlog; |
| 58 | }; |
| 59 | |
| 60 | #define TYPE_XEN_CONSOLE_DEVICE "xen-console" |
| 61 | OBJECT_DECLARE_SIMPLE_TYPE(XenConsole, XEN_CONSOLE_DEVICE) |
| 62 | |
| 63 | static bool buffer_append(XenConsole *con) |
| 64 | { |
| 65 | struct buffer *buffer = &con->buffer; |
| 66 | XENCONS_RING_IDX cons, prod, size; |
| 67 | struct xencons_interface *intf = con->sring; |
| 68 | |
| 69 | cons = intf->out_cons; |
| 70 | prod = intf->out_prod; |
| 71 | xen_mb(); |
| 72 | |
| 73 | size = prod - cons; |
| 74 | if ((size == 0) || (size > sizeof(intf->out))) |
| 75 | return false; |
| 76 | |
| 77 | if ((buffer->capacity - buffer->size) < size) { |
| 78 | buffer->capacity += (size + 1024); |
| 79 | buffer->data = g_realloc(buffer->data, buffer->capacity); |
| 80 | } |
| 81 | |
| 82 | while (cons != prod) |
| 83 | buffer->data[buffer->size++] = intf->out[ |
| 84 | MASK_XENCONS_IDX(cons++, intf->out)]; |
| 85 | |
| 86 | xen_mb(); |
| 87 | intf->out_cons = cons; |
| 88 | xen_device_notify_event_channel(XEN_DEVICE(con), con->event_channel, NULL); |
| 89 | |
| 90 | if (buffer->max_capacity && |
| 91 | buffer->size > buffer->max_capacity) { |
| 92 | /* Discard the middle of the data. */ |
| 93 | |
| 94 | size_t over = buffer->size - buffer->max_capacity; |
| 95 | uint8_t *maxpos = buffer->data + buffer->max_capacity; |
| 96 | |
| 97 | memmove(maxpos - over, maxpos, over); |
| 98 | buffer->data = g_realloc(buffer->data, buffer->max_capacity); |
| 99 | buffer->size = buffer->capacity = buffer->max_capacity; |
| 100 | |
| 101 | if (buffer->consumed > buffer->max_capacity - over) |
| 102 | buffer->consumed = buffer->max_capacity - over; |
| 103 | } |
| 104 | return true; |
| 105 | } |
| 106 | |
| 107 | static void buffer_advance(struct buffer *buffer, size_t len) |
| 108 | { |
| 109 | buffer->consumed += len; |
| 110 | if (buffer->consumed == buffer->size) { |
| 111 | buffer->consumed = 0; |
| 112 | buffer->size = 0; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | static int ring_free_bytes(XenConsole *con) |
| 117 | { |
| 118 | struct xencons_interface *intf = con->sring; |
| 119 | XENCONS_RING_IDX cons, prod, space; |
| 120 | |
| 121 | cons = intf->in_cons; |
| 122 | prod = intf->in_prod; |
| 123 | xen_mb(); |
| 124 | |
| 125 | space = prod - cons; |
| 126 | if (space > sizeof(intf->in)) |
| 127 | return 0; /* ring is screwed: ignore it */ |
| 128 | |
| 129 | return (sizeof(intf->in) - space); |
| 130 | } |
| 131 | |
| 132 | static int xencons_can_receive(void *opaque) |
| 133 | { |
| 134 | XenConsole *con = opaque; |
| 135 | return ring_free_bytes(con); |
| 136 | } |
| 137 | |
| 138 | static void xencons_receive(void *opaque, const uint8_t *buf, int len) |
| 139 | { |
| 140 | XenConsole *con = opaque; |
| 141 | struct xencons_interface *intf = con->sring; |
| 142 | XENCONS_RING_IDX prod; |
| 143 | int i, max; |
| 144 | |
| 145 | max = ring_free_bytes(con); |
| 146 | /* The can_receive() func limits this, but check again anyway */ |
| 147 | if (max < len) |
| 148 | len = max; |
| 149 | |
| 150 | prod = intf->in_prod; |
| 151 | for (i = 0; i < len; i++) { |
| 152 | intf->in[MASK_XENCONS_IDX(prod++, intf->in)] = |
| 153 | buf[i]; |
| 154 | } |
| 155 | xen_wmb(); |
| 156 | intf->in_prod = prod; |
| 157 | xen_device_notify_event_channel(XEN_DEVICE(con), con->event_channel, NULL); |
| 158 | } |
| 159 | |
| 160 | static bool xencons_send(XenConsole *con) |
| 161 | { |
| 162 | ssize_t len, size; |
| 163 | |
| 164 | size = con->buffer.size - con->buffer.consumed; |
| 165 | if (qemu_chr_fe_backend_connected(&con->chr)) { |
| 166 | len = qemu_chr_fe_write(&con->chr, |
| 167 | con->buffer.data + con->buffer.consumed, |
| 168 | size); |
| 169 | } else { |
| 170 | len = size; |
| 171 | } |
| 172 | if (len < 1) { |
| 173 | if (!con->backlog) { |
| 174 | con->backlog = 1; |
| 175 | } |
| 176 | } else { |
| 177 | buffer_advance(&con->buffer, len); |
| 178 | if (con->backlog && len == size) { |
| 179 | con->backlog = 0; |
| 180 | } |
| 181 | } |
| 182 | return len > 0; |
| 183 | } |
| 184 | |
| 185 | /* -------------------------------------------------------------------- */ |
| 186 | |
| 187 | static bool con_event(void *_xendev) |
| 188 | { |
| 189 | XenConsole *con = XEN_CONSOLE_DEVICE(_xendev); |
| 190 | bool done_something; |
| 191 | |
| 192 | if (xen_device_backend_get_state(&con->xendev) != XenbusStateConnected) { |
| 193 | return false; |
| 194 | } |
| 195 | |
| 196 | done_something = buffer_append(con); |
| 197 | |
| 198 | if (con->buffer.size - con->buffer.consumed) { |
| 199 | done_something |= xencons_send(con); |
| 200 | } |
| 201 | return done_something; |
| 202 | } |
| 203 | |
| 204 | /* -------------------------------------------------------------------- */ |
| 205 | |
| 206 | static bool xen_console_connect(XenDevice *xendev, Error **errp) |
| 207 | { |
| 208 | ERRP_GUARD(); |
| 209 | XenConsole *con = XEN_CONSOLE_DEVICE(xendev); |
| 210 | unsigned int port, limit; |
| 211 | |
| 212 | if (xen_device_frontend_scanf(xendev, "ring-ref", "%u", |
| 213 | &con->ring_ref) != 1) { |
| 214 | error_setg(errp, "failed to read ring-ref"); |
| 215 | return false; |
| 216 | } |
| 217 | |
| 218 | if (xen_device_frontend_scanf(xendev, "port", "%u", &port) != 1) { |
| 219 | error_setg(errp, "failed to read remote port"); |
| 220 | return false; |
| 221 | } |
| 222 | |
| 223 | if (xen_device_frontend_scanf(xendev, "limit", "%u", &limit) == 1) { |
| 224 | con->buffer.max_capacity = limit; |
| 225 | } |
| 226 | |
| 227 | con->event_channel = xen_device_bind_event_channel(xendev, port, |
| 228 | con_event, |
| 229 | con, |
| 230 | errp); |
| 231 | if (!con->event_channel) { |
| 232 | return false; |
| 233 | } |
| 234 | |
| 235 | switch (con->dev) { |
| 236 | case 0: |
| 237 | /* |
| 238 | * The primary console is special. For real Xen the ring-ref is |
| 239 | * actually a GFN which needs to be mapped as foreignmem. |
| 240 | */ |
| 241 | if (xen_mode != XEN_EMULATE) { |
| 242 | xen_pfn_t mfn = (xen_pfn_t)con->ring_ref; |
| 243 | con->sring = qemu_xen_foreignmem_map(xendev->frontend_id, NULL, |
| 244 | PROT_READ | PROT_WRITE, |
| 245 | 1, &mfn, NULL); |
| 246 | if (!con->sring) { |
| 247 | error_setg(errp, "failed to map console page"); |
| 248 | return false; |
| 249 | } |
| 250 | break; |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * For Xen emulation, we still follow the convention of ring-ref |
| 255 | * holding the GFN, but we map the fixed GNTTAB_RESERVED_CONSOLE |
| 256 | * grant ref because there is no implementation of foreignmem |
| 257 | * operations for emulated mode. The emulation code which handles |
| 258 | * the guest-side page and event channel also needs to be informed |
| 259 | * of the backend event channel port, in order to reconnect to it |
| 260 | * after a soft reset. |
| 261 | */ |
| 262 | xen_primary_console_set_be_port( |
| 263 | xen_event_channel_get_local_port(con->event_channel)); |
| 264 | con->ring_ref = GNTTAB_RESERVED_CONSOLE; |
| 265 | /* fallthrough */ |
| 266 | default: |
| 267 | con->sring = xen_device_map_grant_refs(xendev, |
| 268 | &con->ring_ref, 1, |
| 269 | PROT_READ | PROT_WRITE, |
| 270 | errp); |
| 271 | if (!con->sring) { |
| 272 | error_prepend(errp, "failed to map console grant ref: "); |
| 273 | return false; |
| 274 | } |
| 275 | break; |
| 276 | } |
| 277 | |
| 278 | trace_xen_console_connect(con->dev, con->ring_ref, port, |
| 279 | con->buffer.max_capacity); |
| 280 | |
| 281 | qemu_chr_fe_set_handlers(&con->chr, xencons_can_receive, |
| 282 | xencons_receive, NULL, NULL, con, NULL, |
| 283 | true); |
| 284 | return true; |
| 285 | } |
| 286 | |
| 287 | static void xen_console_disconnect(XenDevice *xendev, Error **errp) |
| 288 | { |
| 289 | XenConsole *con = XEN_CONSOLE_DEVICE(xendev); |
| 290 | |
| 291 | trace_xen_console_disconnect(con->dev); |
| 292 | |
| 293 | qemu_chr_fe_set_handlers(&con->chr, NULL, NULL, NULL, NULL, |
| 294 | con, NULL, true); |
| 295 | |
| 296 | if (con->event_channel) { |
| 297 | xen_device_unbind_event_channel(xendev, con->event_channel, |
| 298 | errp); |
| 299 | con->event_channel = NULL; |
| 300 | |
| 301 | if (xen_mode == XEN_EMULATE && !con->dev) { |
| 302 | xen_primary_console_set_be_port(0); |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | if (con->sring) { |
| 307 | if (!con->dev && xen_mode != XEN_EMULATE) { |
| 308 | qemu_xen_foreignmem_unmap(con->sring, 1); |
| 309 | } else { |
| 310 | xen_device_unmap_grant_refs(xendev, con->sring, |
| 311 | &con->ring_ref, 1, errp); |
| 312 | } |
| 313 | con->sring = NULL; |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | static void xen_console_frontend_changed(XenDevice *xendev, |
| 318 | enum xenbus_state frontend_state, |
| 319 | Error **errp) |
| 320 | { |
| 321 | ERRP_GUARD(); |
| 322 | enum xenbus_state backend_state = xen_device_backend_get_state(xendev); |
| 323 | |
| 324 | switch (frontend_state) { |
| 325 | case XenbusStateInitialised: |
| 326 | case XenbusStateConnected: |
| 327 | if (backend_state == XenbusStateConnected) { |
| 328 | break; |
| 329 | } |
| 330 | |
| 331 | xen_console_disconnect(xendev, errp); |
| 332 | if (*errp) { |
| 333 | break; |
| 334 | } |
| 335 | |
| 336 | if (!xen_console_connect(xendev, errp)) { |
| 337 | xen_device_backend_set_state(xendev, XenbusStateClosing); |
| 338 | break; |
| 339 | } |
| 340 | |
| 341 | xen_device_backend_set_state(xendev, XenbusStateConnected); |
| 342 | break; |
| 343 | |
| 344 | case XenbusStateClosing: |
| 345 | xen_device_backend_set_state(xendev, XenbusStateClosing); |
| 346 | break; |
| 347 | |
| 348 | case XenbusStateClosed: |
| 349 | case XenbusStateUnknown: |
| 350 | xen_console_disconnect(xendev, errp); |
| 351 | if (*errp) { |
| 352 | break; |
| 353 | } |
| 354 | |
| 355 | xen_device_backend_set_state(xendev, XenbusStateClosed); |
| 356 | break; |
| 357 | |
| 358 | default: |
| 359 | break; |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | static char *xen_console_get_name(XenDevice *xendev, Error **errp) |
| 364 | { |
| 365 | XenConsole *con = XEN_CONSOLE_DEVICE(xendev); |
| 366 | |
| 367 | if (con->dev == -1) { |
| 368 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 369 | int idx = (xen_mode == XEN_EMULATE) ? 0 : 1; |
| 370 | Error *local_err = NULL; |
| 371 | char *value; |
| 372 | |
| 373 | /* Theoretically we could go up to INT_MAX here but that's overkill */ |
| 374 | while (idx < 100) { |
| 375 | if (!idx) { |
| 376 | value = xs_node_read(xenbus->xsh, XBT_NULL, NULL, &local_err, |
| 377 | "/local/domain/%u/console", |
| 378 | xendev->frontend_id); |
| 379 | } else { |
| 380 | value = xs_node_read(xenbus->xsh, XBT_NULL, NULL, &local_err, |
| 381 | "/local/domain/%u/device/console/%u", |
| 382 | xendev->frontend_id, idx); |
| 383 | } |
| 384 | if (!value) { |
| 385 | if (errno == ENOENT) { |
| 386 | con->dev = idx; |
| 387 | error_free(local_err); |
| 388 | goto found; |
| 389 | } |
| 390 | error_propagate(errp, local_err); |
| 391 | return NULL; |
| 392 | } |
| 393 | free(value); |
| 394 | idx++; |
| 395 | } |
| 396 | error_setg(errp, "cannot find device index for console device"); |
| 397 | return NULL; |
| 398 | } |
| 399 | found: |
| 400 | return g_strdup_printf("%u", con->dev); |
| 401 | } |
| 402 | |
| 403 | static void xen_console_unrealize(XenDevice *xendev) |
| 404 | { |
| 405 | XenConsole *con = XEN_CONSOLE_DEVICE(xendev); |
| 406 | |
| 407 | trace_xen_console_unrealize(con->dev); |
| 408 | |
| 409 | /* Disconnect from the frontend in case this has not already happened */ |
| 410 | xen_console_disconnect(xendev, NULL); |
| 411 | |
| 412 | qemu_chr_fe_deinit(&con->chr, false); |
| 413 | } |
| 414 | |
| 415 | static void xen_console_realize(XenDevice *xendev, Error **errp) |
| 416 | { |
| 417 | ERRP_GUARD(); |
| 418 | XenConsole *con = XEN_CONSOLE_DEVICE(xendev); |
| 419 | Chardev *cs = qemu_chr_fe_get_driver(&con->chr); |
| 420 | unsigned int u; |
| 421 | g_autofree char *pty_name = NULL; |
| 422 | |
| 423 | if (!cs) { |
| 424 | error_setg(errp, "no backing character device"); |
| 425 | return; |
| 426 | } |
| 427 | |
| 428 | if (con->dev == -1) { |
| 429 | error_setg(errp, "no device index provided"); |
| 430 | return; |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * The Xen primary console is special. The ring-ref is actually a GFN to |
| 435 | * be mapped directly as foreignmem (not a grant ref), and the guest port |
| 436 | * was allocated *for* the guest by the toolstack. The guest gets these |
| 437 | * through HVMOP_get_param and can use the console long before it's got |
| 438 | * XenStore up and running. We cannot create those for a true Xen guest, |
| 439 | * but we can for Xen emulation. |
| 440 | */ |
| 441 | if (!con->dev) { |
| 442 | if (xen_mode == XEN_EMULATE) { |
| 443 | xen_primary_console_create(); |
| 444 | } else if (xen_device_frontend_scanf(xendev, "ring-ref", "%u", &u) |
| 445 | != 1 || |
| 446 | xen_device_frontend_scanf(xendev, "port", "%u", &u) != 1) { |
| 447 | error_setg(errp, "cannot create primary Xen console"); |
| 448 | return; |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | trace_xen_console_realize(con->dev, object_get_typename(OBJECT(cs))); |
| 453 | |
| 454 | pty_name = qemu_chr_get_pty_name(cs); |
| 455 | if (pty_name) { |
| 456 | xen_device_frontend_printf(xendev, "tty", "%s", pty_name); |
| 457 | } |
| 458 | |
| 459 | /* No normal PV driver initialization for the primary console under Xen */ |
| 460 | if (!con->dev && xen_mode != XEN_EMULATE) { |
| 461 | xen_console_connect(xendev, errp); |
| 462 | } |
| 463 | } |
| 464 | |
| 465 | static char *console_frontend_path(struct qemu_xs_handle *xenstore, |
| 466 | unsigned int dom_id, unsigned int dev) |
| 467 | { |
| 468 | if (!dev) { |
| 469 | return g_strdup_printf("/local/domain/%u/console", dom_id); |
| 470 | } else { |
| 471 | return g_strdup_printf("/local/domain/%u/device/console/%u", dom_id, |
| 472 | dev); |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | static char *xen_console_get_frontend_path(XenDevice *xendev, Error **errp) |
| 477 | { |
| 478 | XenConsole *con = XEN_CONSOLE_DEVICE(xendev); |
| 479 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 480 | char *ret = console_frontend_path(xenbus->xsh, xendev->frontend_id, |
| 481 | con->dev); |
| 482 | |
| 483 | if (!ret) { |
| 484 | error_setg(errp, "failed to create frontend path"); |
| 485 | } |
| 486 | return ret; |
| 487 | } |
| 488 | |
| 489 | |
| 490 | static const Property xen_console_properties[] = { |
| 491 | DEFINE_PROP_CHR("chardev", XenConsole, chr), |
| 492 | DEFINE_PROP_INT32("idx", XenConsole, dev, -1), |
| 493 | }; |
| 494 | |
| 495 | static void xen_console_class_init(ObjectClass *class, const void *data) |
| 496 | { |
| 497 | DeviceClass *dev_class = DEVICE_CLASS(class); |
| 498 | XenDeviceClass *xendev_class = XEN_DEVICE_CLASS(class); |
| 499 | |
| 500 | xendev_class->backend = "console"; |
| 501 | xendev_class->device = "console"; |
| 502 | xendev_class->get_name = xen_console_get_name; |
| 503 | xendev_class->realize = xen_console_realize; |
| 504 | xendev_class->frontend_changed = xen_console_frontend_changed; |
| 505 | xendev_class->unrealize = xen_console_unrealize; |
| 506 | xendev_class->get_frontend_path = xen_console_get_frontend_path; |
| 507 | |
| 508 | device_class_set_props(dev_class, xen_console_properties); |
| 509 | } |
| 510 | |
| 511 | static const TypeInfo xen_console_type_info = { |
| 512 | .name = TYPE_XEN_CONSOLE_DEVICE, |
| 513 | .parent = TYPE_XEN_DEVICE, |
| 514 | .instance_size = sizeof(XenConsole), |
| 515 | .class_init = xen_console_class_init, |
| 516 | }; |
| 517 | |
| 518 | static void xen_console_register_types(void) |
| 519 | { |
| 520 | type_register_static(&xen_console_type_info); |
| 521 | } |
| 522 | |
| 523 | type_init(xen_console_register_types) |
| 524 | |
| 525 | /* Called to instantiate a XenConsole when the backend is detected. */ |
| 526 | static void xen_console_device_create(XenBackendInstance *backend, |
| 527 | QDict *opts, Error **errp) |
| 528 | { |
| 529 | ERRP_GUARD(); |
| 530 | XenBus *xenbus = xen_backend_get_bus(backend); |
| 531 | const char *name = xen_backend_get_name(backend); |
| 532 | unsigned long number; |
| 533 | char *fe = NULL, *type = NULL, *output = NULL; |
| 534 | char label[32]; |
| 535 | XenDevice *xendev = NULL; |
| 536 | XenConsole *con; |
| 537 | Chardev *cd = NULL; |
| 538 | struct qemu_xs_handle *xsh = xenbus->xsh; |
| 539 | |
| 540 | if (qemu_strtoul(name, NULL, 10, &number) || number > INT_MAX) { |
| 541 | error_setg(errp, "failed to parse name '%s'", name); |
| 542 | goto fail; |
| 543 | } |
| 544 | |
| 545 | trace_xen_console_device_create(number); |
| 546 | |
| 547 | fe = console_frontend_path(xsh, xen_domid, number); |
| 548 | if (fe == NULL) { |
| 549 | error_setg(errp, "failed to generate frontend path"); |
| 550 | goto fail; |
| 551 | } |
| 552 | |
| 553 | type = xs_node_read(xsh, XBT_NULL, NULL, errp, "%s/%s", fe, "type"); |
| 554 | if (!type) { |
| 555 | error_prepend(errp, "failed to read console device type: "); |
| 556 | goto fail; |
| 557 | } |
| 558 | |
| 559 | if (strcmp(type, "ioemu")) { |
| 560 | error_setg(errp, "declining to handle console type '%s'", |
| 561 | type); |
| 562 | goto fail; |
| 563 | } |
| 564 | |
| 565 | xendev = XEN_DEVICE(qdev_new(TYPE_XEN_CONSOLE_DEVICE)); |
| 566 | con = XEN_CONSOLE_DEVICE(xendev); |
| 567 | |
| 568 | con->dev = number; |
| 569 | |
| 570 | snprintf(label, sizeof(label), "xencons%ld", number); |
| 571 | |
| 572 | output = xs_node_read(xsh, XBT_NULL, NULL, errp, "%s/%s", fe, "output"); |
| 573 | if (output) { |
| 574 | /* |
| 575 | * FIXME: sure we want to support implicit |
| 576 | * muxed monitors here? |
| 577 | */ |
| 578 | cd = qemu_chr_new_mux_mon(label, output, NULL); |
| 579 | if (!cd) { |
| 580 | error_setg(errp, "console: No valid chardev found at '%s': ", |
| 581 | output); |
| 582 | goto fail; |
| 583 | } |
| 584 | } else if (errno != ENOENT) { |
| 585 | error_prepend(errp, "console: No valid chardev found: "); |
| 586 | goto fail; |
| 587 | } else { |
| 588 | error_free(*errp); |
| 589 | *errp = NULL; |
| 590 | |
| 591 | if (number) { |
| 592 | cd = serial_hd(number); |
| 593 | if (!cd) { |
| 594 | error_setg(errp, "console: No serial device #%ld found", |
| 595 | number); |
| 596 | goto fail; |
| 597 | } |
| 598 | } else { |
| 599 | /* No 'output' node on primary console: use null. */ |
| 600 | cd = qemu_chr_new(label, "null", NULL); |
| 601 | if (!cd) { |
| 602 | error_setg(errp, "console: failed to create null device"); |
| 603 | goto fail; |
| 604 | } |
| 605 | } |
| 606 | } |
| 607 | |
| 608 | if (!qemu_chr_fe_init(&con->chr, cd, errp)) { |
| 609 | error_prepend(errp, "console: failed to initialize backing chardev: "); |
| 610 | goto fail; |
| 611 | } |
| 612 | |
| 613 | if (qdev_realize_and_unref(DEVICE(xendev), BUS(xenbus), errp)) { |
| 614 | xen_backend_set_device(backend, xendev); |
| 615 | goto done; |
| 616 | } |
| 617 | |
| 618 | error_prepend(errp, "realization of console device %lu failed: ", |
| 619 | number); |
| 620 | |
| 621 | fail: |
| 622 | if (xendev) { |
| 623 | object_unparent(OBJECT(xendev)); |
| 624 | } |
| 625 | done: |
| 626 | g_free(fe); |
| 627 | free(type); |
| 628 | free(output); |
| 629 | } |
| 630 | |
| 631 | static void xen_console_device_destroy(XenBackendInstance *backend, |
| 632 | Error **errp) |
| 633 | { |
| 634 | ERRP_GUARD(); |
| 635 | XenDevice *xendev = xen_backend_get_device(backend); |
| 636 | XenConsole *con = XEN_CONSOLE_DEVICE(xendev); |
| 637 | |
| 638 | trace_xen_console_device_destroy(con->dev); |
| 639 | |
| 640 | object_unparent(OBJECT(xendev)); |
| 641 | } |
| 642 | |
| 643 | static const XenBackendInfo xen_console_backend_info = { |
| 644 | .type = "console", |
| 645 | .create = xen_console_device_create, |
| 646 | .destroy = xen_console_device_destroy, |
| 647 | }; |
| 648 | |
| 649 | static void xen_console_register_backend(void) |
| 650 | { |
| 651 | xen_backend_register(&xen_console_backend_info); |
| 652 | } |
| 653 | |
| 654 | xen_backend_init(xen_console_register_backend); |