| 1 | /* |
| 2 | * Copyright (c) 2018 Citrix Systems Inc. |
| 3 | * |
| 4 | * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| 5 | * See the COPYING file in the top-level directory. |
| 6 | */ |
| 7 | |
| 8 | #include "qemu/osdep.h" |
| 9 | #include "qemu/main-loop.h" |
| 10 | #include "qemu/module.h" |
| 11 | #include "qemu/uuid.h" |
| 12 | #include "hw/core/qdev-properties.h" |
| 13 | #include "hw/core/sysbus.h" |
| 14 | #include "hw/xen/xen.h" |
| 15 | #include "hw/xen/xen-backend.h" |
| 16 | #include "hw/xen/xen-legacy-backend.h" /* xen_be_init() */ |
| 17 | #include "hw/xen/xen-bus.h" |
| 18 | #include "hw/xen/xen-bus-helper.h" |
| 19 | #include "monitor/monitor.h" |
| 20 | #include "monitor/hmp.h" |
| 21 | #include "qapi/error.h" |
| 22 | #include "qobject/qdict.h" |
| 23 | #include "system/system.h" |
| 24 | #include "net/net.h" |
| 25 | #include "trace.h" |
| 26 | |
| 27 | static char *xen_device_get_backend_path(XenDevice *xendev) |
| 28 | { |
| 29 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 30 | XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev); |
| 31 | const char *type = object_get_typename(OBJECT(xendev)); |
| 32 | const char *backend = xendev_class->backend; |
| 33 | |
| 34 | if (!backend) { |
| 35 | backend = type; |
| 36 | } |
| 37 | |
| 38 | return g_strdup_printf("/local/domain/%u/backend/%s/%u/%s", |
| 39 | xenbus->backend_id, backend, xendev->frontend_id, |
| 40 | xendev->name); |
| 41 | } |
| 42 | |
| 43 | static char *xen_device_get_frontend_path(XenDevice *xendev) |
| 44 | { |
| 45 | XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev); |
| 46 | const char *type = object_get_typename(OBJECT(xendev)); |
| 47 | const char *device = xendev_class->device; |
| 48 | |
| 49 | if (!device) { |
| 50 | device = type; |
| 51 | } |
| 52 | |
| 53 | return g_strdup_printf("/local/domain/%u/device/%s/%s", |
| 54 | xendev->frontend_id, device, xendev->name); |
| 55 | } |
| 56 | |
| 57 | static void xen_device_unplug(XenDevice *xendev, Error **errp) |
| 58 | { |
| 59 | ERRP_GUARD(); |
| 60 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 61 | const char *type = object_get_typename(OBJECT(xendev)); |
| 62 | xs_transaction_t tid; |
| 63 | |
| 64 | trace_xen_device_unplug(type, xendev->name); |
| 65 | |
| 66 | /* Mimic the way the Xen toolstack does an unplug */ |
| 67 | again: |
| 68 | tid = qemu_xen_xs_transaction_start(xenbus->xsh); |
| 69 | if (tid == XBT_NULL) { |
| 70 | error_setg_errno(errp, errno, "failed xs_transaction_start"); |
| 71 | return; |
| 72 | } |
| 73 | |
| 74 | xs_node_printf(xenbus->xsh, tid, xendev->backend_path, "online", |
| 75 | errp, "%u", 0); |
| 76 | if (*errp) { |
| 77 | goto abort; |
| 78 | } |
| 79 | |
| 80 | xs_node_printf(xenbus->xsh, tid, xendev->backend_path, "state", |
| 81 | errp, "%u", XenbusStateClosing); |
| 82 | if (*errp) { |
| 83 | goto abort; |
| 84 | } |
| 85 | |
| 86 | if (!qemu_xen_xs_transaction_end(xenbus->xsh, tid, false)) { |
| 87 | if (errno == EAGAIN) { |
| 88 | goto again; |
| 89 | } |
| 90 | |
| 91 | error_setg_errno(errp, errno, "failed xs_transaction_end"); |
| 92 | } |
| 93 | |
| 94 | return; |
| 95 | |
| 96 | abort: |
| 97 | /* |
| 98 | * We only abort if there is already a failure so ignore any error |
| 99 | * from ending the transaction. |
| 100 | */ |
| 101 | qemu_xen_xs_transaction_end(xenbus->xsh, tid, true); |
| 102 | } |
| 103 | |
| 104 | #ifdef CONFIG_HMP |
| 105 | static void xen_bus_print_dev(MonitorHMP *hmp, DeviceState *dev, int indent) |
| 106 | { |
| 107 | XenDevice *xendev = XEN_DEVICE(dev); |
| 108 | |
| 109 | monitor_hmp_printf(hmp, "%*sname = '%s' frontend_id = %u\n", |
| 110 | indent, "", xendev->name, xendev->frontend_id); |
| 111 | } |
| 112 | #endif |
| 113 | |
| 114 | static char *xen_bus_get_dev_path(DeviceState *dev) |
| 115 | { |
| 116 | return xen_device_get_backend_path(XEN_DEVICE(dev)); |
| 117 | } |
| 118 | |
| 119 | static void xen_bus_backend_create(XenBus *xenbus, const char *type, |
| 120 | const char *name, char *path, |
| 121 | Error **errp) |
| 122 | { |
| 123 | ERRP_GUARD(); |
| 124 | xs_transaction_t tid; |
| 125 | char **key; |
| 126 | QDict *opts; |
| 127 | unsigned int i, n; |
| 128 | |
| 129 | trace_xen_bus_backend_create(type, path); |
| 130 | |
| 131 | again: |
| 132 | tid = qemu_xen_xs_transaction_start(xenbus->xsh); |
| 133 | if (tid == XBT_NULL) { |
| 134 | error_setg(errp, "failed xs_transaction_start"); |
| 135 | return; |
| 136 | } |
| 137 | |
| 138 | key = qemu_xen_xs_directory(xenbus->xsh, tid, path, &n); |
| 139 | if (!key) { |
| 140 | if (!qemu_xen_xs_transaction_end(xenbus->xsh, tid, true)) { |
| 141 | error_setg_errno(errp, errno, "failed xs_transaction_end"); |
| 142 | } |
| 143 | return; |
| 144 | } |
| 145 | |
| 146 | opts = qdict_new(); |
| 147 | for (i = 0; i < n; i++) { |
| 148 | char *val; |
| 149 | |
| 150 | /* |
| 151 | * Assume anything found in the xenstore backend area, other than |
| 152 | * the keys created for a generic XenDevice, are parameters |
| 153 | * to be used to configure the backend. |
| 154 | */ |
| 155 | if (!strcmp(key[i], "state") || |
| 156 | !strcmp(key[i], "online") || |
| 157 | !strcmp(key[i], "frontend") || |
| 158 | !strcmp(key[i], "frontend-id") || |
| 159 | !strcmp(key[i], "hotplug-status")) |
| 160 | continue; |
| 161 | |
| 162 | val = xs_node_read(xenbus->xsh, tid, NULL, NULL, "%s/%s", path, key[i]); |
| 163 | if (val) { |
| 164 | qdict_put_str(opts, key[i], val); |
| 165 | free(val); |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | free(key); |
| 170 | |
| 171 | if (!qemu_xen_xs_transaction_end(xenbus->xsh, tid, false)) { |
| 172 | qobject_unref(opts); |
| 173 | |
| 174 | if (errno == EAGAIN) { |
| 175 | goto again; |
| 176 | } |
| 177 | |
| 178 | error_setg_errno(errp, errno, "failed xs_transaction_end"); |
| 179 | return; |
| 180 | } |
| 181 | |
| 182 | xen_backend_device_create(xenbus, type, name, opts, errp); |
| 183 | qobject_unref(opts); |
| 184 | |
| 185 | if (*errp) { |
| 186 | error_prepend(errp, "failed to create '%s' device '%s': ", type, name); |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | static void xen_bus_type_enumerate(XenBus *xenbus, const char *type) |
| 191 | { |
| 192 | char *domain_path = g_strdup_printf("backend/%s/%u", type, xen_domid); |
| 193 | char **backend; |
| 194 | unsigned int i, n; |
| 195 | |
| 196 | trace_xen_bus_type_enumerate(type); |
| 197 | |
| 198 | backend = qemu_xen_xs_directory(xenbus->xsh, XBT_NULL, domain_path, &n); |
| 199 | if (!backend) { |
| 200 | goto out; |
| 201 | } |
| 202 | |
| 203 | for (i = 0; i < n; i++) { |
| 204 | char *backend_path = g_strdup_printf("%s/%s", domain_path, |
| 205 | backend[i]); |
| 206 | enum xenbus_state state; |
| 207 | unsigned int online; |
| 208 | |
| 209 | if (xs_node_scanf(xenbus->xsh, XBT_NULL, backend_path, "state", |
| 210 | NULL, "%u", &state) != 1) |
| 211 | state = XenbusStateUnknown; |
| 212 | |
| 213 | if (xs_node_scanf(xenbus->xsh, XBT_NULL, backend_path, "online", |
| 214 | NULL, "%u", &online) != 1) |
| 215 | online = 0; |
| 216 | |
| 217 | if (online && state == XenbusStateInitialising && |
| 218 | !xen_backend_exists(type, backend[i])) { |
| 219 | Error *local_err = NULL; |
| 220 | |
| 221 | xen_bus_backend_create(xenbus, type, backend[i], backend_path, |
| 222 | &local_err); |
| 223 | if (local_err) { |
| 224 | error_report_err(local_err); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | g_free(backend_path); |
| 229 | } |
| 230 | |
| 231 | free(backend); |
| 232 | |
| 233 | out: |
| 234 | g_free(domain_path); |
| 235 | } |
| 236 | |
| 237 | static void xen_bus_enumerate(XenBus *xenbus) |
| 238 | { |
| 239 | char **type; |
| 240 | unsigned int i, n; |
| 241 | |
| 242 | trace_xen_bus_enumerate(); |
| 243 | |
| 244 | type = qemu_xen_xs_directory(xenbus->xsh, XBT_NULL, "backend", &n); |
| 245 | if (!type) { |
| 246 | return; |
| 247 | } |
| 248 | |
| 249 | for (i = 0; i < n; i++) { |
| 250 | xen_bus_type_enumerate(xenbus, type[i]); |
| 251 | } |
| 252 | |
| 253 | free(type); |
| 254 | } |
| 255 | |
| 256 | static void xen_bus_device_cleanup(XenDevice *xendev) |
| 257 | { |
| 258 | const char *type = object_get_typename(OBJECT(xendev)); |
| 259 | Error *local_err = NULL; |
| 260 | |
| 261 | trace_xen_bus_device_cleanup(type, xendev->name); |
| 262 | |
| 263 | g_assert(!xendev->backend_online); |
| 264 | |
| 265 | if (!xen_backend_try_device_destroy(xendev, &local_err)) { |
| 266 | object_unparent(OBJECT(xendev)); |
| 267 | } |
| 268 | |
| 269 | if (local_err) { |
| 270 | error_report_err(local_err); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | static void xen_bus_cleanup(XenBus *xenbus) |
| 275 | { |
| 276 | XenDevice *xendev, *next; |
| 277 | |
| 278 | trace_xen_bus_cleanup(); |
| 279 | |
| 280 | QLIST_FOREACH_SAFE(xendev, &xenbus->inactive_devices, list, next) { |
| 281 | g_assert(xendev->inactive); |
| 282 | QLIST_REMOVE(xendev, list); |
| 283 | xen_bus_device_cleanup(xendev); |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | static void xen_bus_backend_changed(void *opaque, const char *path) |
| 288 | { |
| 289 | XenBus *xenbus = opaque; |
| 290 | |
| 291 | xen_bus_enumerate(xenbus); |
| 292 | xen_bus_cleanup(xenbus); |
| 293 | } |
| 294 | |
| 295 | static void xen_bus_unrealize(BusState *bus) |
| 296 | { |
| 297 | XenBus *xenbus = XEN_BUS(bus); |
| 298 | |
| 299 | trace_xen_bus_unrealize(); |
| 300 | |
| 301 | if (xenbus->backend_watch) { |
| 302 | unsigned int i; |
| 303 | |
| 304 | for (i = 0; i < xenbus->backend_types; i++) { |
| 305 | if (xenbus->backend_watch[i]) { |
| 306 | xs_node_unwatch(xenbus->xsh, xenbus->backend_watch[i]); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | g_free(xenbus->backend_watch); |
| 311 | xenbus->backend_watch = NULL; |
| 312 | } |
| 313 | |
| 314 | if (xenbus->xsh) { |
| 315 | qemu_xen_xs_close(xenbus->xsh); |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | static void xen_bus_realize(BusState *bus, Error **errp) |
| 320 | { |
| 321 | char *key = g_strdup_printf("%u", xen_domid); |
| 322 | XenBus *xenbus = XEN_BUS(bus); |
| 323 | unsigned int domid; |
| 324 | const char **type; |
| 325 | unsigned int i; |
| 326 | Error *local_err = NULL; |
| 327 | |
| 328 | trace_xen_bus_realize(); |
| 329 | |
| 330 | xenbus->xsh = qemu_xen_xs_open(); |
| 331 | if (!xenbus->xsh) { |
| 332 | error_setg_errno(errp, errno, "failed xs_open"); |
| 333 | goto fail; |
| 334 | } |
| 335 | |
| 336 | /* Initialize legacy backend core & drivers */ |
| 337 | xen_be_init(); |
| 338 | |
| 339 | if (xs_node_scanf(xenbus->xsh, XBT_NULL, "", /* domain root node */ |
| 340 | "domid", NULL, "%u", &domid) == 1) { |
| 341 | xenbus->backend_id = domid; |
| 342 | } else { |
| 343 | xenbus->backend_id = 0; /* Assume lack of node means dom0 */ |
| 344 | } |
| 345 | |
| 346 | module_call_init(MODULE_INIT_XEN_BACKEND); |
| 347 | |
| 348 | type = xen_backend_get_types(&xenbus->backend_types); |
| 349 | xenbus->backend_watch = g_new(struct qemu_xs_watch *, |
| 350 | xenbus->backend_types); |
| 351 | |
| 352 | for (i = 0; i < xenbus->backend_types; i++) { |
| 353 | char *node = g_strdup_printf("backend/%s", type[i]); |
| 354 | |
| 355 | xenbus->backend_watch[i] = |
| 356 | xs_node_watch(xenbus->xsh, node, key, xen_bus_backend_changed, |
| 357 | xenbus, &local_err); |
| 358 | if (local_err) { |
| 359 | warn_reportf_err(local_err, |
| 360 | "failed to set up '%s' enumeration watch: ", |
| 361 | type[i]); |
| 362 | local_err = NULL; |
| 363 | } |
| 364 | |
| 365 | g_free(node); |
| 366 | } |
| 367 | |
| 368 | g_free(type); |
| 369 | g_free(key); |
| 370 | return; |
| 371 | |
| 372 | fail: |
| 373 | xen_bus_unrealize(bus); |
| 374 | g_free(key); |
| 375 | } |
| 376 | |
| 377 | static void xen_bus_unplug_request(HotplugHandler *hotplug, |
| 378 | DeviceState *dev, |
| 379 | Error **errp) |
| 380 | { |
| 381 | XenDevice *xendev = XEN_DEVICE(dev); |
| 382 | |
| 383 | xen_device_unplug(xendev, errp); |
| 384 | } |
| 385 | |
| 386 | static void xen_bus_class_init(ObjectClass *class, const void *data) |
| 387 | { |
| 388 | BusClass *bus_class = BUS_CLASS(class); |
| 389 | HotplugHandlerClass *hotplug_class = HOTPLUG_HANDLER_CLASS(class); |
| 390 | |
| 391 | #ifdef CONFIG_HMP |
| 392 | bus_class->print_dev = xen_bus_print_dev; |
| 393 | #endif |
| 394 | bus_class->get_dev_path = xen_bus_get_dev_path; |
| 395 | bus_class->realize = xen_bus_realize; |
| 396 | bus_class->unrealize = xen_bus_unrealize; |
| 397 | |
| 398 | hotplug_class->unplug_request = xen_bus_unplug_request; |
| 399 | } |
| 400 | |
| 401 | static const TypeInfo xen_bus_type_info = { |
| 402 | .name = TYPE_XEN_BUS, |
| 403 | .parent = TYPE_BUS, |
| 404 | .instance_size = sizeof(XenBus), |
| 405 | .class_size = sizeof(XenBusClass), |
| 406 | .class_init = xen_bus_class_init, |
| 407 | .interfaces = (const InterfaceInfo[]) { |
| 408 | { TYPE_HOTPLUG_HANDLER }, |
| 409 | { } |
| 410 | }, |
| 411 | }; |
| 412 | |
| 413 | void xen_device_backend_printf(XenDevice *xendev, const char *key, |
| 414 | const char *fmt, ...) |
| 415 | { |
| 416 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 417 | Error *local_err = NULL; |
| 418 | va_list ap; |
| 419 | |
| 420 | g_assert(xenbus->xsh); |
| 421 | |
| 422 | va_start(ap, fmt); |
| 423 | xs_node_vprintf(xenbus->xsh, XBT_NULL, xendev->backend_path, key, |
| 424 | &local_err, fmt, ap); |
| 425 | va_end(ap); |
| 426 | |
| 427 | if (local_err) { |
| 428 | error_report_err(local_err); |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | G_GNUC_SCANF(3, 4) |
| 433 | static int xen_device_backend_scanf(XenDevice *xendev, const char *key, |
| 434 | const char *fmt, ...) |
| 435 | { |
| 436 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 437 | va_list ap; |
| 438 | int rc; |
| 439 | |
| 440 | g_assert(xenbus->xsh); |
| 441 | |
| 442 | va_start(ap, fmt); |
| 443 | rc = xs_node_vscanf(xenbus->xsh, XBT_NULL, xendev->backend_path, key, |
| 444 | NULL, fmt, ap); |
| 445 | va_end(ap); |
| 446 | |
| 447 | return rc; |
| 448 | } |
| 449 | |
| 450 | void xen_device_backend_set_state(XenDevice *xendev, |
| 451 | enum xenbus_state state) |
| 452 | { |
| 453 | const char *type = object_get_typename(OBJECT(xendev)); |
| 454 | |
| 455 | if (xendev->backend_state == state) { |
| 456 | return; |
| 457 | } |
| 458 | |
| 459 | trace_xen_device_backend_state(type, xendev->name, |
| 460 | xs_strstate(state)); |
| 461 | |
| 462 | xendev->backend_state = state; |
| 463 | xen_device_backend_printf(xendev, "state", "%u", state); |
| 464 | } |
| 465 | |
| 466 | enum xenbus_state xen_device_backend_get_state(XenDevice *xendev) |
| 467 | { |
| 468 | return xendev->backend_state; |
| 469 | } |
| 470 | |
| 471 | static void xen_device_backend_set_online(XenDevice *xendev, bool online) |
| 472 | { |
| 473 | const char *type = object_get_typename(OBJECT(xendev)); |
| 474 | |
| 475 | if (xendev->backend_online == online) { |
| 476 | return; |
| 477 | } |
| 478 | |
| 479 | trace_xen_device_backend_online(type, xendev->name, online); |
| 480 | |
| 481 | xendev->backend_online = online; |
| 482 | xen_device_backend_printf(xendev, "online", "%u", online); |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Tell from the state whether the frontend is likely alive, |
| 487 | * i.e. it will react to a change of state of the backend. |
| 488 | */ |
| 489 | static bool xen_device_frontend_is_active(XenDevice *xendev) |
| 490 | { |
| 491 | switch (xendev->frontend_state) { |
| 492 | case XenbusStateInitWait: |
| 493 | case XenbusStateInitialised: |
| 494 | case XenbusStateConnected: |
| 495 | case XenbusStateClosing: |
| 496 | return true; |
| 497 | default: |
| 498 | return false; |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | static void xen_device_backend_changed(void *opaque, const char *path) |
| 503 | { |
| 504 | XenDevice *xendev = opaque; |
| 505 | const char *type = object_get_typename(OBJECT(xendev)); |
| 506 | enum xenbus_state state; |
| 507 | unsigned int online; |
| 508 | |
| 509 | trace_xen_device_backend_changed(type, xendev->name); |
| 510 | |
| 511 | if (xen_device_backend_scanf(xendev, "state", "%u", &state) != 1) { |
| 512 | state = XenbusStateUnknown; |
| 513 | } |
| 514 | |
| 515 | xen_device_backend_set_state(xendev, state); |
| 516 | |
| 517 | if (xen_device_backend_scanf(xendev, "online", "%u", &online) != 1) { |
| 518 | online = 0; |
| 519 | } |
| 520 | |
| 521 | xen_device_backend_set_online(xendev, !!online); |
| 522 | |
| 523 | /* |
| 524 | * If the toolstack (or unplug request callback) has set the backend |
| 525 | * state to Closing, but there is no active frontend then set the |
| 526 | * backend state to Closed. |
| 527 | */ |
| 528 | if (state == XenbusStateClosing && |
| 529 | !xen_device_frontend_is_active(xendev)) { |
| 530 | xen_device_backend_set_state(xendev, XenbusStateClosed); |
| 531 | } |
| 532 | |
| 533 | /* |
| 534 | * If a backend is still 'online' then we should leave it alone but, |
| 535 | * if a backend is not 'online', then the device is a candidate |
| 536 | * for destruction. Hence add it to the 'inactive' list to be cleaned |
| 537 | * by xen_bus_cleanup(). |
| 538 | */ |
| 539 | if (!online && |
| 540 | (state == XenbusStateClosed || state == XenbusStateInitialising || |
| 541 | state == XenbusStateInitWait || state == XenbusStateUnknown) && |
| 542 | !xendev->inactive) { |
| 543 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 544 | |
| 545 | xendev->inactive = true; |
| 546 | QLIST_INSERT_HEAD(&xenbus->inactive_devices, xendev, list); |
| 547 | |
| 548 | /* |
| 549 | * Re-write the state to cause a XenBus backend_watch notification, |
| 550 | * resulting in a call to xen_bus_cleanup(). |
| 551 | */ |
| 552 | xen_device_backend_printf(xendev, "state", "%u", state); |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | static void xen_device_backend_create(XenDevice *xendev, Error **errp) |
| 557 | { |
| 558 | ERRP_GUARD(); |
| 559 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 560 | |
| 561 | xendev->backend_path = xen_device_get_backend_path(xendev); |
| 562 | |
| 563 | g_assert(xenbus->xsh); |
| 564 | |
| 565 | xs_node_create(xenbus->xsh, XBT_NULL, xendev->backend_path, |
| 566 | xenbus->backend_id, xendev->frontend_id, XS_PERM_READ, errp); |
| 567 | if (*errp) { |
| 568 | error_prepend(errp, "failed to create backend: "); |
| 569 | return; |
| 570 | } |
| 571 | |
| 572 | xendev->backend_state_watch = |
| 573 | xs_node_watch(xendev->xsh, xendev->backend_path, |
| 574 | "state", xen_device_backend_changed, xendev, |
| 575 | errp); |
| 576 | if (*errp) { |
| 577 | error_prepend(errp, "failed to watch backend state: "); |
| 578 | return; |
| 579 | } |
| 580 | |
| 581 | xendev->backend_online_watch = |
| 582 | xs_node_watch(xendev->xsh, xendev->backend_path, |
| 583 | "online", xen_device_backend_changed, xendev, |
| 584 | errp); |
| 585 | if (*errp) { |
| 586 | error_prepend(errp, "failed to watch backend online: "); |
| 587 | return; |
| 588 | } |
| 589 | } |
| 590 | |
| 591 | static void xen_device_backend_destroy(XenDevice *xendev) |
| 592 | { |
| 593 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 594 | Error *local_err = NULL; |
| 595 | |
| 596 | if (xendev->backend_online_watch) { |
| 597 | xs_node_unwatch(xendev->xsh, xendev->backend_online_watch); |
| 598 | xendev->backend_online_watch = NULL; |
| 599 | } |
| 600 | |
| 601 | if (xendev->backend_state_watch) { |
| 602 | xs_node_unwatch(xendev->xsh, xendev->backend_state_watch); |
| 603 | xendev->backend_state_watch = NULL; |
| 604 | } |
| 605 | |
| 606 | if (!xendev->backend_path) { |
| 607 | return; |
| 608 | } |
| 609 | |
| 610 | g_assert(xenbus->xsh); |
| 611 | |
| 612 | xs_node_destroy(xenbus->xsh, XBT_NULL, xendev->backend_path, |
| 613 | &local_err); |
| 614 | g_free(xendev->backend_path); |
| 615 | xendev->backend_path = NULL; |
| 616 | |
| 617 | if (local_err) { |
| 618 | error_report_err(local_err); |
| 619 | } |
| 620 | } |
| 621 | |
| 622 | void xen_device_frontend_printf(XenDevice *xendev, const char *key, |
| 623 | const char *fmt, ...) |
| 624 | { |
| 625 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 626 | Error *local_err = NULL; |
| 627 | va_list ap; |
| 628 | |
| 629 | g_assert(xenbus->xsh); |
| 630 | |
| 631 | va_start(ap, fmt); |
| 632 | xs_node_vprintf(xenbus->xsh, XBT_NULL, xendev->frontend_path, key, |
| 633 | &local_err, fmt, ap); |
| 634 | va_end(ap); |
| 635 | |
| 636 | if (local_err) { |
| 637 | error_report_err(local_err); |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | int xen_device_frontend_scanf(XenDevice *xendev, const char *key, |
| 642 | const char *fmt, ...) |
| 643 | { |
| 644 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 645 | va_list ap; |
| 646 | int rc; |
| 647 | |
| 648 | g_assert(xenbus->xsh); |
| 649 | |
| 650 | va_start(ap, fmt); |
| 651 | rc = xs_node_vscanf(xenbus->xsh, XBT_NULL, xendev->frontend_path, key, |
| 652 | NULL, fmt, ap); |
| 653 | va_end(ap); |
| 654 | |
| 655 | return rc; |
| 656 | } |
| 657 | |
| 658 | char *xen_device_frontend_read(XenDevice *xendev, const char *key) |
| 659 | { |
| 660 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 661 | |
| 662 | g_assert(xenbus->xsh); |
| 663 | |
| 664 | return xs_node_read(xenbus->xsh, XBT_NULL, NULL, NULL, "%s/%s", |
| 665 | xendev->frontend_path, key); |
| 666 | } |
| 667 | |
| 668 | static void xen_device_frontend_set_state(XenDevice *xendev, |
| 669 | enum xenbus_state state, |
| 670 | bool publish) |
| 671 | { |
| 672 | const char *type = object_get_typename(OBJECT(xendev)); |
| 673 | |
| 674 | if (xendev->frontend_state == state) { |
| 675 | return; |
| 676 | } |
| 677 | |
| 678 | trace_xen_device_frontend_state(type, xendev->name, |
| 679 | xs_strstate(state)); |
| 680 | |
| 681 | xendev->frontend_state = state; |
| 682 | if (publish) { |
| 683 | xen_device_frontend_printf(xendev, "state", "%u", state); |
| 684 | } |
| 685 | } |
| 686 | |
| 687 | static void xen_device_frontend_changed(void *opaque, const char *path) |
| 688 | { |
| 689 | XenDevice *xendev = opaque; |
| 690 | XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev); |
| 691 | const char *type = object_get_typename(OBJECT(xendev)); |
| 692 | enum xenbus_state state; |
| 693 | |
| 694 | trace_xen_device_frontend_changed(type, xendev->name); |
| 695 | |
| 696 | if (xen_device_frontend_scanf(xendev, "state", "%u", &state) != 1) { |
| 697 | state = XenbusStateUnknown; |
| 698 | } |
| 699 | |
| 700 | xen_device_frontend_set_state(xendev, state, false); |
| 701 | |
| 702 | if (state == XenbusStateInitialising && |
| 703 | xendev->backend_state == XenbusStateClosed && |
| 704 | xendev->backend_online) { |
| 705 | /* |
| 706 | * The frontend is re-initializing so switch back to |
| 707 | * InitWait. |
| 708 | */ |
| 709 | xen_device_backend_set_state(xendev, XenbusStateInitWait); |
| 710 | return; |
| 711 | } |
| 712 | |
| 713 | if (xendev_class->frontend_changed) { |
| 714 | Error *local_err = NULL; |
| 715 | |
| 716 | xendev_class->frontend_changed(xendev, state, &local_err); |
| 717 | |
| 718 | if (local_err) { |
| 719 | error_reportf_err(local_err, "frontend change error: "); |
| 720 | } |
| 721 | } |
| 722 | } |
| 723 | |
| 724 | static bool xen_device_frontend_exists(XenDevice *xendev) |
| 725 | { |
| 726 | enum xenbus_state state; |
| 727 | |
| 728 | return (xen_device_frontend_scanf(xendev, "state", "%u", &state) == 1); |
| 729 | } |
| 730 | |
| 731 | static void xen_device_frontend_create(XenDevice *xendev, Error **errp) |
| 732 | { |
| 733 | ERRP_GUARD(); |
| 734 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 735 | XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev); |
| 736 | |
| 737 | if (xendev_class->get_frontend_path) { |
| 738 | xendev->frontend_path = xendev_class->get_frontend_path(xendev, errp); |
| 739 | if (!xendev->frontend_path) { |
| 740 | error_prepend(errp, "failed to create frontend: "); |
| 741 | return; |
| 742 | } |
| 743 | } else { |
| 744 | xendev->frontend_path = xen_device_get_frontend_path(xendev); |
| 745 | } |
| 746 | |
| 747 | /* |
| 748 | * The frontend area may have already been created by a legacy |
| 749 | * toolstack. |
| 750 | */ |
| 751 | if (!xen_device_frontend_exists(xendev)) { |
| 752 | g_assert(xenbus->xsh); |
| 753 | |
| 754 | xs_node_create(xenbus->xsh, XBT_NULL, xendev->frontend_path, |
| 755 | xendev->frontend_id, xenbus->backend_id, |
| 756 | XS_PERM_READ | XS_PERM_WRITE, errp); |
| 757 | if (*errp) { |
| 758 | error_prepend(errp, "failed to create frontend: "); |
| 759 | return; |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | xendev->frontend_state_watch = |
| 764 | xs_node_watch(xendev->xsh, xendev->frontend_path, "state", |
| 765 | xen_device_frontend_changed, xendev, errp); |
| 766 | if (*errp) { |
| 767 | error_prepend(errp, "failed to watch frontend state: "); |
| 768 | } |
| 769 | } |
| 770 | |
| 771 | static void xen_device_frontend_destroy(XenDevice *xendev) |
| 772 | { |
| 773 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 774 | Error *local_err = NULL; |
| 775 | |
| 776 | if (xendev->frontend_state_watch) { |
| 777 | xs_node_unwatch(xendev->xsh, xendev->frontend_state_watch); |
| 778 | xendev->frontend_state_watch = NULL; |
| 779 | } |
| 780 | |
| 781 | if (!xendev->frontend_path) { |
| 782 | return; |
| 783 | } |
| 784 | |
| 785 | g_assert(xenbus->xsh); |
| 786 | |
| 787 | xs_node_destroy(xenbus->xsh, XBT_NULL, xendev->frontend_path, |
| 788 | &local_err); |
| 789 | g_free(xendev->frontend_path); |
| 790 | xendev->frontend_path = NULL; |
| 791 | |
| 792 | if (local_err) { |
| 793 | error_report_err(local_err); |
| 794 | } |
| 795 | } |
| 796 | |
| 797 | void xen_device_set_max_grant_refs(XenDevice *xendev, unsigned int nr_refs, |
| 798 | Error **errp) |
| 799 | { |
| 800 | if (qemu_xen_gnttab_set_max_grants(xendev->xgth, nr_refs)) { |
| 801 | error_setg_errno(errp, errno, "xengnttab_set_max_grants failed"); |
| 802 | } |
| 803 | } |
| 804 | |
| 805 | void *xen_device_map_grant_refs(XenDevice *xendev, uint32_t *refs, |
| 806 | unsigned int nr_refs, int prot, |
| 807 | Error **errp) |
| 808 | { |
| 809 | void *map = qemu_xen_gnttab_map_refs(xendev->xgth, nr_refs, |
| 810 | xendev->frontend_id, refs, prot); |
| 811 | |
| 812 | if (!map) { |
| 813 | error_setg_errno(errp, errno, |
| 814 | "xengnttab_map_domain_grant_refs failed"); |
| 815 | } |
| 816 | |
| 817 | return map; |
| 818 | } |
| 819 | |
| 820 | void xen_device_unmap_grant_refs(XenDevice *xendev, void *map, uint32_t *refs, |
| 821 | unsigned int nr_refs, Error **errp) |
| 822 | { |
| 823 | if (qemu_xen_gnttab_unmap(xendev->xgth, map, refs, nr_refs)) { |
| 824 | error_setg_errno(errp, errno, "xengnttab_unmap failed"); |
| 825 | } |
| 826 | } |
| 827 | |
| 828 | void xen_device_copy_grant_refs(XenDevice *xendev, bool to_domain, |
| 829 | XenDeviceGrantCopySegment segs[], |
| 830 | unsigned int nr_segs, Error **errp) |
| 831 | { |
| 832 | qemu_xen_gnttab_grant_copy(xendev->xgth, to_domain, xendev->frontend_id, |
| 833 | (XenGrantCopySegment *)segs, nr_segs, errp); |
| 834 | } |
| 835 | |
| 836 | struct XenEventChannel { |
| 837 | QLIST_ENTRY(XenEventChannel) list; |
| 838 | AioContext *ctx; |
| 839 | xenevtchn_handle *xeh; |
| 840 | evtchn_port_t local_port; |
| 841 | XenEventHandler handler; |
| 842 | void *opaque; |
| 843 | }; |
| 844 | |
| 845 | static bool xen_device_poll(void *opaque) |
| 846 | { |
| 847 | XenEventChannel *channel = opaque; |
| 848 | |
| 849 | return channel->handler(channel->opaque); |
| 850 | } |
| 851 | |
| 852 | static void xen_device_event(void *opaque) |
| 853 | { |
| 854 | XenEventChannel *channel = opaque; |
| 855 | unsigned long port = qemu_xen_evtchn_pending(channel->xeh); |
| 856 | |
| 857 | if (port == channel->local_port) { |
| 858 | xen_device_poll(channel); |
| 859 | |
| 860 | qemu_xen_evtchn_unmask(channel->xeh, port); |
| 861 | } |
| 862 | } |
| 863 | |
| 864 | void xen_device_set_event_channel_context(XenDevice *xendev, |
| 865 | XenEventChannel *channel, |
| 866 | AioContext *ctx, |
| 867 | Error **errp) |
| 868 | { |
| 869 | if (!channel) { |
| 870 | error_setg(errp, "bad channel"); |
| 871 | return; |
| 872 | } |
| 873 | |
| 874 | if (channel->ctx) |
| 875 | aio_set_fd_handler(channel->ctx, qemu_xen_evtchn_fd(channel->xeh), |
| 876 | NULL, NULL, NULL, NULL, NULL); |
| 877 | |
| 878 | channel->ctx = ctx; |
| 879 | if (ctx) { |
| 880 | aio_set_fd_handler(channel->ctx, qemu_xen_evtchn_fd(channel->xeh), |
| 881 | xen_device_event, NULL, xen_device_poll, NULL, |
| 882 | channel); |
| 883 | } |
| 884 | } |
| 885 | |
| 886 | XenEventChannel *xen_device_bind_event_channel(XenDevice *xendev, |
| 887 | unsigned int port, |
| 888 | XenEventHandler handler, |
| 889 | void *opaque, Error **errp) |
| 890 | { |
| 891 | XenEventChannel *channel = g_new0(XenEventChannel, 1); |
| 892 | xenevtchn_port_or_error_t local_port; |
| 893 | |
| 894 | channel->xeh = qemu_xen_evtchn_open(); |
| 895 | if (!channel->xeh) { |
| 896 | error_setg_errno(errp, errno, "failed xenevtchn_open"); |
| 897 | goto fail; |
| 898 | } |
| 899 | |
| 900 | local_port = qemu_xen_evtchn_bind_interdomain(channel->xeh, |
| 901 | xendev->frontend_id, |
| 902 | port); |
| 903 | if (local_port < 0) { |
| 904 | error_setg_errno(errp, errno, "xenevtchn_bind_interdomain failed"); |
| 905 | goto fail; |
| 906 | } |
| 907 | |
| 908 | channel->local_port = local_port; |
| 909 | channel->handler = handler; |
| 910 | channel->opaque = opaque; |
| 911 | |
| 912 | /* Only reason for failure is a NULL channel */ |
| 913 | xen_device_set_event_channel_context(xendev, channel, |
| 914 | qemu_get_aio_context(), |
| 915 | &error_abort); |
| 916 | |
| 917 | QLIST_INSERT_HEAD(&xendev->event_channels, channel, list); |
| 918 | |
| 919 | return channel; |
| 920 | |
| 921 | fail: |
| 922 | if (channel->xeh) { |
| 923 | qemu_xen_evtchn_close(channel->xeh); |
| 924 | } |
| 925 | |
| 926 | g_free(channel); |
| 927 | |
| 928 | return NULL; |
| 929 | } |
| 930 | |
| 931 | void xen_device_notify_event_channel(XenDevice *xendev, |
| 932 | XenEventChannel *channel, |
| 933 | Error **errp) |
| 934 | { |
| 935 | if (!channel) { |
| 936 | error_setg(errp, "bad channel"); |
| 937 | return; |
| 938 | } |
| 939 | |
| 940 | if (qemu_xen_evtchn_notify(channel->xeh, channel->local_port) < 0) { |
| 941 | error_setg_errno(errp, errno, "xenevtchn_notify failed"); |
| 942 | } |
| 943 | } |
| 944 | |
| 945 | unsigned int xen_event_channel_get_local_port(XenEventChannel *channel) |
| 946 | { |
| 947 | return channel->local_port; |
| 948 | } |
| 949 | |
| 950 | void xen_device_unbind_event_channel(XenDevice *xendev, |
| 951 | XenEventChannel *channel, |
| 952 | Error **errp) |
| 953 | { |
| 954 | if (!channel) { |
| 955 | error_setg(errp, "bad channel"); |
| 956 | return; |
| 957 | } |
| 958 | |
| 959 | QLIST_REMOVE(channel, list); |
| 960 | |
| 961 | if (channel->ctx) { |
| 962 | aio_set_fd_handler(channel->ctx, qemu_xen_evtchn_fd(channel->xeh), |
| 963 | NULL, NULL, NULL, NULL, NULL); |
| 964 | } |
| 965 | |
| 966 | if (qemu_xen_evtchn_unbind(channel->xeh, channel->local_port) < 0) { |
| 967 | error_setg_errno(errp, errno, "xenevtchn_unbind failed"); |
| 968 | } |
| 969 | |
| 970 | qemu_xen_evtchn_close(channel->xeh); |
| 971 | g_free(channel); |
| 972 | } |
| 973 | |
| 974 | static void xen_device_unrealize(DeviceState *dev) |
| 975 | { |
| 976 | XenDevice *xendev = XEN_DEVICE(dev); |
| 977 | XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev); |
| 978 | const char *type = object_get_typename(OBJECT(xendev)); |
| 979 | XenEventChannel *channel, *next; |
| 980 | |
| 981 | if (!xendev->name) { |
| 982 | return; |
| 983 | } |
| 984 | |
| 985 | trace_xen_device_unrealize(type, xendev->name); |
| 986 | |
| 987 | if (xendev->exit.notify) { |
| 988 | qemu_remove_exit_notifier(&xendev->exit); |
| 989 | xendev->exit.notify = NULL; |
| 990 | } |
| 991 | |
| 992 | if (xendev_class->unrealize) { |
| 993 | xendev_class->unrealize(xendev); |
| 994 | } |
| 995 | |
| 996 | /* Make sure all event channels are cleaned up */ |
| 997 | QLIST_FOREACH_SAFE(channel, &xendev->event_channels, list, next) { |
| 998 | xen_device_unbind_event_channel(xendev, channel, NULL); |
| 999 | } |
| 1000 | |
| 1001 | xen_device_frontend_destroy(xendev); |
| 1002 | xen_device_backend_destroy(xendev); |
| 1003 | |
| 1004 | if (xendev->xgth) { |
| 1005 | qemu_xen_gnttab_close(xendev->xgth); |
| 1006 | xendev->xgth = NULL; |
| 1007 | } |
| 1008 | |
| 1009 | if (xendev->xsh) { |
| 1010 | qemu_xen_xs_close(xendev->xsh); |
| 1011 | xendev->xsh = NULL; |
| 1012 | } |
| 1013 | |
| 1014 | g_free(xendev->name); |
| 1015 | xendev->name = NULL; |
| 1016 | } |
| 1017 | |
| 1018 | static void xen_device_exit(Notifier *n, void *data) |
| 1019 | { |
| 1020 | XenDevice *xendev = container_of(n, XenDevice, exit); |
| 1021 | |
| 1022 | xen_device_unrealize(DEVICE(xendev)); |
| 1023 | } |
| 1024 | |
| 1025 | static void xen_device_realize(DeviceState *dev, Error **errp) |
| 1026 | { |
| 1027 | ERRP_GUARD(); |
| 1028 | XenDevice *xendev = XEN_DEVICE(dev); |
| 1029 | XenDeviceClass *xendev_class = XEN_DEVICE_GET_CLASS(xendev); |
| 1030 | XenBus *xenbus = XEN_BUS(qdev_get_parent_bus(DEVICE(xendev))); |
| 1031 | const char *type = object_get_typename(OBJECT(xendev)); |
| 1032 | |
| 1033 | if (xendev->frontend_id == DOMID_INVALID) { |
| 1034 | xendev->frontend_id = xen_domid; |
| 1035 | } |
| 1036 | |
| 1037 | if (xendev->frontend_id >= DOMID_FIRST_RESERVED) { |
| 1038 | error_setg(errp, "invalid frontend-id"); |
| 1039 | goto unrealize; |
| 1040 | } |
| 1041 | |
| 1042 | if (!xendev_class->get_name) { |
| 1043 | error_setg(errp, "get_name method not implemented"); |
| 1044 | goto unrealize; |
| 1045 | } |
| 1046 | |
| 1047 | xendev->name = xendev_class->get_name(xendev, errp); |
| 1048 | if (*errp) { |
| 1049 | error_prepend(errp, "failed to get device name: "); |
| 1050 | goto unrealize; |
| 1051 | } |
| 1052 | |
| 1053 | trace_xen_device_realize(type, xendev->name); |
| 1054 | |
| 1055 | xendev->xsh = qemu_xen_xs_open(); |
| 1056 | if (!xendev->xsh) { |
| 1057 | error_setg_errno(errp, errno, "failed xs_open"); |
| 1058 | goto unrealize; |
| 1059 | } |
| 1060 | |
| 1061 | xendev->xgth = qemu_xen_gnttab_open(); |
| 1062 | if (!xendev->xgth) { |
| 1063 | error_setg_errno(errp, errno, "failed xengnttab_open"); |
| 1064 | goto unrealize; |
| 1065 | } |
| 1066 | |
| 1067 | xen_device_backend_create(xendev, errp); |
| 1068 | if (*errp) { |
| 1069 | goto unrealize; |
| 1070 | } |
| 1071 | |
| 1072 | xen_device_frontend_create(xendev, errp); |
| 1073 | if (*errp) { |
| 1074 | goto unrealize; |
| 1075 | } |
| 1076 | |
| 1077 | xen_device_backend_printf(xendev, "frontend", "%s", |
| 1078 | xendev->frontend_path); |
| 1079 | xen_device_backend_printf(xendev, "frontend-id", "%u", |
| 1080 | xendev->frontend_id); |
| 1081 | xen_device_backend_printf(xendev, "hotplug-status", "connected"); |
| 1082 | |
| 1083 | xen_device_backend_set_online(xendev, true); |
| 1084 | xen_device_backend_set_state(xendev, XenbusStateInitWait); |
| 1085 | |
| 1086 | if (!xen_device_frontend_exists(xendev)) { |
| 1087 | xen_device_frontend_printf(xendev, "backend", "%s", |
| 1088 | xendev->backend_path); |
| 1089 | xen_device_frontend_printf(xendev, "backend-id", "%u", |
| 1090 | xenbus->backend_id); |
| 1091 | |
| 1092 | xen_device_frontend_set_state(xendev, XenbusStateInitialising, true); |
| 1093 | } |
| 1094 | |
| 1095 | if (xendev_class->realize) { |
| 1096 | xendev_class->realize(xendev, errp); |
| 1097 | if (*errp) { |
| 1098 | goto unrealize; |
| 1099 | } |
| 1100 | } |
| 1101 | |
| 1102 | xendev->exit.notify = xen_device_exit; |
| 1103 | qemu_add_exit_notifier(&xendev->exit); |
| 1104 | return; |
| 1105 | |
| 1106 | unrealize: |
| 1107 | xen_device_unrealize(dev); |
| 1108 | } |
| 1109 | |
| 1110 | static const Property xen_device_props[] = { |
| 1111 | DEFINE_PROP_UINT16("frontend-id", XenDevice, frontend_id, |
| 1112 | DOMID_INVALID), |
| 1113 | }; |
| 1114 | |
| 1115 | static void xen_device_class_init(ObjectClass *class, const void *data) |
| 1116 | { |
| 1117 | DeviceClass *dev_class = DEVICE_CLASS(class); |
| 1118 | |
| 1119 | dev_class->realize = xen_device_realize; |
| 1120 | dev_class->unrealize = xen_device_unrealize; |
| 1121 | device_class_set_props(dev_class, xen_device_props); |
| 1122 | dev_class->bus_type = TYPE_XEN_BUS; |
| 1123 | } |
| 1124 | |
| 1125 | static const TypeInfo xen_device_type_info = { |
| 1126 | .name = TYPE_XEN_DEVICE, |
| 1127 | .parent = TYPE_DEVICE, |
| 1128 | .instance_size = sizeof(XenDevice), |
| 1129 | .abstract = true, |
| 1130 | .class_size = sizeof(XenDeviceClass), |
| 1131 | .class_init = xen_device_class_init, |
| 1132 | }; |
| 1133 | |
| 1134 | typedef struct XenBridge { |
| 1135 | SysBusDevice busdev; |
| 1136 | } XenBridge; |
| 1137 | |
| 1138 | #define TYPE_XEN_BRIDGE "xen-bridge" |
| 1139 | |
| 1140 | static const TypeInfo xen_bridge_type_info = { |
| 1141 | .name = TYPE_XEN_BRIDGE, |
| 1142 | .parent = TYPE_SYS_BUS_DEVICE, |
| 1143 | .instance_size = sizeof(XenBridge), |
| 1144 | }; |
| 1145 | |
| 1146 | static void xen_register_types(void) |
| 1147 | { |
| 1148 | type_register_static(&xen_bridge_type_info); |
| 1149 | type_register_static(&xen_bus_type_info); |
| 1150 | type_register_static(&xen_device_type_info); |
| 1151 | } |
| 1152 | |
| 1153 | type_init(xen_register_types) |
| 1154 | |
| 1155 | void xen_bus_init(void) |
| 1156 | { |
| 1157 | DeviceState *dev = qdev_new(TYPE_XEN_BRIDGE); |
| 1158 | BusState *bus = qbus_new(TYPE_XEN_BUS, dev, NULL); |
| 1159 | |
| 1160 | sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); |
| 1161 | qbus_set_bus_hotplug_handler(bus); |
| 1162 | |
| 1163 | qemu_create_nic_bus_devices(bus, TYPE_XEN_DEVICE, "xen-net-device", |
| 1164 | "xen", "xen-net-device"); |
| 1165 | } |