| 1 | /* |
| 2 | * xen backend driver infrastructure |
| 3 | * (c) 2008 Gerd Hoffmann <kraxel@redhat.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; under version 2 of the License. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, see <http://www.gnu.org/licenses/>. |
| 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 | /* |
| 22 | * TODO: add some xenbus / xenstore concepts overview here. |
| 23 | */ |
| 24 | |
| 25 | #include "qemu/osdep.h" |
| 26 | |
| 27 | #include "hw/core/sysbus.h" |
| 28 | #include "hw/core/boards.h" |
| 29 | #include "hw/core/qdev-properties.h" |
| 30 | #include "qemu/main-loop.h" |
| 31 | #include "qapi/error.h" |
| 32 | #include "hw/xen/xen-legacy-backend.h" |
| 33 | #include "hw/xen/xen_pvdev.h" |
| 34 | #include "monitor/qdev.h" |
| 35 | |
| 36 | DeviceState *xen_sysdev; |
| 37 | BusState *xen_sysbus; |
| 38 | |
| 39 | /* ------------------------------------------------------------- */ |
| 40 | |
| 41 | /* public */ |
| 42 | struct qemu_xs_handle *xenstore; |
| 43 | const char *xen_protocol; |
| 44 | |
| 45 | /* private */ |
| 46 | static int debug; |
| 47 | |
| 48 | int xenstore_write_be_str(struct XenLegacyDevice *xendev, const char *node, |
| 49 | const char *val) |
| 50 | { |
| 51 | return xenstore_write_str(xendev->be, node, val); |
| 52 | } |
| 53 | |
| 54 | int xenstore_write_be_int(struct XenLegacyDevice *xendev, const char *node, |
| 55 | int ival) |
| 56 | { |
| 57 | return xenstore_write_int(xendev->be, node, ival); |
| 58 | } |
| 59 | |
| 60 | int xenstore_write_be_int64(struct XenLegacyDevice *xendev, const char *node, |
| 61 | int64_t ival) |
| 62 | { |
| 63 | return xenstore_write_int64(xendev->be, node, ival); |
| 64 | } |
| 65 | |
| 66 | char *xenstore_read_be_str(struct XenLegacyDevice *xendev, const char *node) |
| 67 | { |
| 68 | return xenstore_read_str(xendev->be, node); |
| 69 | } |
| 70 | |
| 71 | int xenstore_read_be_int(struct XenLegacyDevice *xendev, const char *node, |
| 72 | int *ival) |
| 73 | { |
| 74 | return xenstore_read_int(xendev->be, node, ival); |
| 75 | } |
| 76 | |
| 77 | char *xenstore_read_fe_str(struct XenLegacyDevice *xendev, const char *node) |
| 78 | { |
| 79 | return xenstore_read_str(xendev->fe, node); |
| 80 | } |
| 81 | |
| 82 | int xenstore_read_fe_int(struct XenLegacyDevice *xendev, const char *node, |
| 83 | int *ival) |
| 84 | { |
| 85 | return xenstore_read_int(xendev->fe, node, ival); |
| 86 | } |
| 87 | |
| 88 | int xenstore_read_fe_uint64(struct XenLegacyDevice *xendev, const char *node, |
| 89 | uint64_t *uval) |
| 90 | { |
| 91 | return xenstore_read_uint64(xendev->fe, node, uval); |
| 92 | } |
| 93 | |
| 94 | /* ------------------------------------------------------------- */ |
| 95 | |
| 96 | int xen_be_set_state(struct XenLegacyDevice *xendev, enum xenbus_state state) |
| 97 | { |
| 98 | int rc; |
| 99 | |
| 100 | rc = xenstore_write_be_int(xendev, "state", state); |
| 101 | if (rc < 0) { |
| 102 | return rc; |
| 103 | } |
| 104 | xen_pv_printf(xendev, 1, "backend state: %s -> %s\n", |
| 105 | xenbus_strstate(xendev->be_state), xenbus_strstate(state)); |
| 106 | xendev->be_state = state; |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | void xen_be_set_max_grant_refs(struct XenLegacyDevice *xendev, |
| 111 | unsigned int nr_refs) |
| 112 | { |
| 113 | assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV); |
| 114 | |
| 115 | if (qemu_xen_gnttab_set_max_grants(xendev->gnttabdev, nr_refs)) { |
| 116 | xen_pv_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n", |
| 117 | strerror(errno)); |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | void *xen_be_map_grant_refs(struct XenLegacyDevice *xendev, uint32_t *refs, |
| 122 | unsigned int nr_refs, int prot) |
| 123 | { |
| 124 | void *ptr; |
| 125 | |
| 126 | assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV); |
| 127 | |
| 128 | ptr = qemu_xen_gnttab_map_refs(xendev->gnttabdev, nr_refs, xen_domid, refs, |
| 129 | prot); |
| 130 | if (!ptr) { |
| 131 | xen_pv_printf(xendev, 0, |
| 132 | "xengnttab_map_domain_grant_refs failed: %s\n", |
| 133 | strerror(errno)); |
| 134 | } |
| 135 | |
| 136 | return ptr; |
| 137 | } |
| 138 | |
| 139 | void xen_be_unmap_grant_refs(struct XenLegacyDevice *xendev, void *ptr, |
| 140 | uint32_t *refs, unsigned int nr_refs) |
| 141 | { |
| 142 | assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV); |
| 143 | |
| 144 | if (qemu_xen_gnttab_unmap(xendev->gnttabdev, ptr, refs, nr_refs)) { |
| 145 | xen_pv_printf(xendev, 0, "xengnttab_unmap failed: %s\n", |
| 146 | strerror(errno)); |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | /* |
| 151 | * get xen backend device, allocate a new one if it doesn't exist. |
| 152 | */ |
| 153 | static struct XenLegacyDevice *xen_be_get_xendev(const char *type, int dom, |
| 154 | int dev, |
| 155 | const struct XenDevOps *ops) |
| 156 | { |
| 157 | struct XenLegacyDevice *xendev; |
| 158 | |
| 159 | xendev = xen_pv_find_xendev(type, dom, dev); |
| 160 | if (xendev) { |
| 161 | return xendev; |
| 162 | } |
| 163 | |
| 164 | /* init new xendev */ |
| 165 | xendev = g_malloc0(ops->size); |
| 166 | object_initialize(xendev, ops->size, TYPE_XENBACKEND); |
| 167 | OBJECT(xendev)->free = g_free; |
| 168 | qdev_set_id(DEVICE(xendev), g_strdup_printf("xen-%s-%d", type, dev), |
| 169 | &error_fatal); |
| 170 | qdev_realize(DEVICE(xendev), xen_sysbus, &error_fatal); |
| 171 | object_unref(OBJECT(xendev)); |
| 172 | |
| 173 | xendev->type = type; |
| 174 | xendev->dom = dom; |
| 175 | xendev->dev = dev; |
| 176 | xendev->ops = ops; |
| 177 | |
| 178 | snprintf(xendev->be, sizeof(xendev->be), "backend/%s/%d/%d", |
| 179 | xendev->type, xendev->dom, xendev->dev); |
| 180 | snprintf(xendev->name, sizeof(xendev->name), "%s-%d", |
| 181 | xendev->type, xendev->dev); |
| 182 | |
| 183 | xendev->debug = debug; |
| 184 | xendev->local_port = -1; |
| 185 | |
| 186 | xendev->evtchndev = qemu_xen_evtchn_open(); |
| 187 | if (xendev->evtchndev == NULL) { |
| 188 | xen_pv_printf(NULL, 0, "can't open evtchn device\n"); |
| 189 | qdev_unplug(DEVICE(xendev), NULL); |
| 190 | return NULL; |
| 191 | } |
| 192 | qemu_set_cloexec(qemu_xen_evtchn_fd(xendev->evtchndev)); |
| 193 | |
| 194 | xen_pv_insert_xendev(xendev); |
| 195 | |
| 196 | if (xendev->ops->alloc) { |
| 197 | xendev->ops->alloc(xendev); |
| 198 | } |
| 199 | |
| 200 | return xendev; |
| 201 | } |
| 202 | |
| 203 | |
| 204 | /* |
| 205 | * Sync internal data structures on xenstore updates. |
| 206 | * Node specifies the changed field. node = NULL means |
| 207 | * update all fields (used for initialization). |
| 208 | */ |
| 209 | static void xen_be_backend_changed(struct XenLegacyDevice *xendev, |
| 210 | const char *node) |
| 211 | { |
| 212 | if (node == NULL || strcmp(node, "online") == 0) { |
| 213 | if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) { |
| 214 | xendev->online = 0; |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | if (node) { |
| 219 | xen_pv_printf(xendev, 2, "backend update: %s\n", node); |
| 220 | if (xendev->ops->backend_changed) { |
| 221 | xendev->ops->backend_changed(xendev, node); |
| 222 | } |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | static void xen_be_frontend_changed(struct XenLegacyDevice *xendev, |
| 227 | const char *node) |
| 228 | { |
| 229 | int fe_state; |
| 230 | |
| 231 | if (node == NULL || strcmp(node, "state") == 0) { |
| 232 | if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) { |
| 233 | fe_state = XenbusStateUnknown; |
| 234 | } |
| 235 | if (xendev->fe_state != fe_state) { |
| 236 | xen_pv_printf(xendev, 1, "frontend state: %s -> %s\n", |
| 237 | xenbus_strstate(xendev->fe_state), |
| 238 | xenbus_strstate(fe_state)); |
| 239 | } |
| 240 | xendev->fe_state = fe_state; |
| 241 | } |
| 242 | if (node == NULL || strcmp(node, "protocol") == 0) { |
| 243 | g_free(xendev->protocol); |
| 244 | xendev->protocol = xenstore_read_fe_str(xendev, "protocol"); |
| 245 | if (xendev->protocol) { |
| 246 | xen_pv_printf(xendev, 1, "frontend protocol: %s\n", |
| 247 | xendev->protocol); |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | if (node) { |
| 252 | xen_pv_printf(xendev, 2, "frontend update: %s\n", node); |
| 253 | if (xendev->ops->frontend_changed) { |
| 254 | xendev->ops->frontend_changed(xendev, node); |
| 255 | } |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | static void xenstore_update_fe(void *opaque, const char *watch) |
| 260 | { |
| 261 | struct XenLegacyDevice *xendev = opaque; |
| 262 | const char *node; |
| 263 | unsigned int len; |
| 264 | |
| 265 | len = strlen(xendev->fe); |
| 266 | if (strncmp(xendev->fe, watch, len) != 0) { |
| 267 | return; |
| 268 | } |
| 269 | if (watch[len] != '/') { |
| 270 | return; |
| 271 | } |
| 272 | node = watch + len + 1; |
| 273 | |
| 274 | xen_be_frontend_changed(xendev, node); |
| 275 | xen_be_check_state(xendev); |
| 276 | } |
| 277 | |
| 278 | /* ------------------------------------------------------------- */ |
| 279 | /* Check for possible state transitions and perform them. */ |
| 280 | |
| 281 | /* |
| 282 | * Initial xendev setup. Read frontend path, register watch for it. |
| 283 | * Should succeed once xend finished setting up the backend device. |
| 284 | * |
| 285 | * Also sets initial state (-> Initializing) when done. Which |
| 286 | * only affects the xendev->be_state variable as xenbus should |
| 287 | * already be put into that state by xend. |
| 288 | */ |
| 289 | static int xen_be_try_setup(struct XenLegacyDevice *xendev) |
| 290 | { |
| 291 | int be_state; |
| 292 | |
| 293 | if (xenstore_read_be_int(xendev, "state", &be_state) == -1) { |
| 294 | xen_pv_printf(xendev, 0, "reading backend state failed\n"); |
| 295 | return -1; |
| 296 | } |
| 297 | |
| 298 | if (be_state != XenbusStateInitialising) { |
| 299 | xen_pv_printf(xendev, 0, "initial backend state is wrong (%s)\n", |
| 300 | xenbus_strstate(be_state)); |
| 301 | return -1; |
| 302 | } |
| 303 | |
| 304 | xendev->fe = xenstore_read_be_str(xendev, "frontend"); |
| 305 | if (xendev->fe == NULL) { |
| 306 | xen_pv_printf(xendev, 0, "reading frontend path failed\n"); |
| 307 | return -1; |
| 308 | } |
| 309 | |
| 310 | /* setup frontend watch */ |
| 311 | xendev->watch = qemu_xen_xs_watch(xenstore, xendev->fe, xenstore_update_fe, |
| 312 | xendev); |
| 313 | if (!xendev->watch) { |
| 314 | xen_pv_printf(xendev, 0, "watching frontend path (%s) failed\n", |
| 315 | xendev->fe); |
| 316 | return -1; |
| 317 | } |
| 318 | xen_be_set_state(xendev, XenbusStateInitialising); |
| 319 | |
| 320 | xen_be_backend_changed(xendev, NULL); |
| 321 | xen_be_frontend_changed(xendev, NULL); |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Try initialize xendev. Prepare everything the backend can do |
| 327 | * without synchronizing with the frontend. Fakes hotplug-status. No |
| 328 | * hotplug involved here because this is about userspace drivers, thus |
| 329 | * there are kernel backend devices which could invoke hotplug. |
| 330 | * |
| 331 | * Goes to InitWait on success. |
| 332 | */ |
| 333 | static int xen_be_try_init(struct XenLegacyDevice *xendev) |
| 334 | { |
| 335 | int rc = 0; |
| 336 | |
| 337 | if (!xendev->online) { |
| 338 | xen_pv_printf(xendev, 1, "not online\n"); |
| 339 | return -1; |
| 340 | } |
| 341 | |
| 342 | if (xendev->ops->init) { |
| 343 | rc = xendev->ops->init(xendev); |
| 344 | } |
| 345 | if (rc != 0) { |
| 346 | xen_pv_printf(xendev, 1, "init() failed\n"); |
| 347 | return rc; |
| 348 | } |
| 349 | |
| 350 | xenstore_write_be_str(xendev, "hotplug-status", "connected"); |
| 351 | xen_be_set_state(xendev, XenbusStateInitWait); |
| 352 | return 0; |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * Try to initialise xendev. Depends on the frontend being ready |
| 357 | * for it (shared ring and evtchn info in xenstore, state being |
| 358 | * Initialised or Connected). |
| 359 | * |
| 360 | * Goes to Connected on success. |
| 361 | */ |
| 362 | static int xen_be_try_initialise(struct XenLegacyDevice *xendev) |
| 363 | { |
| 364 | int rc = 0; |
| 365 | |
| 366 | if (xendev->fe_state != XenbusStateInitialised && |
| 367 | xendev->fe_state != XenbusStateConnected) { |
| 368 | if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) { |
| 369 | xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n"); |
| 370 | } else { |
| 371 | xen_pv_printf(xendev, 2, "frontend not ready (yet)\n"); |
| 372 | return -1; |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | if (xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV) { |
| 377 | xendev->gnttabdev = qemu_xen_gnttab_open(); |
| 378 | if (xendev->gnttabdev == NULL) { |
| 379 | xen_pv_printf(NULL, 0, "can't open gnttab device\n"); |
| 380 | return -1; |
| 381 | } |
| 382 | } else { |
| 383 | xendev->gnttabdev = NULL; |
| 384 | } |
| 385 | |
| 386 | if (xendev->ops->initialise) { |
| 387 | rc = xendev->ops->initialise(xendev); |
| 388 | } |
| 389 | if (rc != 0) { |
| 390 | xen_pv_printf(xendev, 0, "initialise() failed\n"); |
| 391 | return rc; |
| 392 | } |
| 393 | |
| 394 | xen_be_set_state(xendev, XenbusStateConnected); |
| 395 | return 0; |
| 396 | } |
| 397 | |
| 398 | /* |
| 399 | * Try to let xendev know that it is connected. Depends on the |
| 400 | * frontend being Connected. Note that this may be called more |
| 401 | * than once since the backend state is not modified. |
| 402 | */ |
| 403 | static void xen_be_try_connected(struct XenLegacyDevice *xendev) |
| 404 | { |
| 405 | if (!xendev->ops->connected) { |
| 406 | return; |
| 407 | } |
| 408 | |
| 409 | if (xendev->fe_state != XenbusStateConnected) { |
| 410 | if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) { |
| 411 | xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n"); |
| 412 | } else { |
| 413 | xen_pv_printf(xendev, 2, "frontend not ready (yet)\n"); |
| 414 | return; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | xendev->ops->connected(xendev); |
| 419 | } |
| 420 | |
| 421 | /* |
| 422 | * Teardown connection. |
| 423 | * |
| 424 | * Goes to Closed when done. |
| 425 | */ |
| 426 | static void xen_be_disconnect(struct XenLegacyDevice *xendev, |
| 427 | enum xenbus_state state) |
| 428 | { |
| 429 | if (xendev->be_state != XenbusStateClosing && |
| 430 | xendev->be_state != XenbusStateClosed && |
| 431 | xendev->ops->disconnect) { |
| 432 | xendev->ops->disconnect(xendev); |
| 433 | } |
| 434 | if (xendev->gnttabdev) { |
| 435 | qemu_xen_gnttab_close(xendev->gnttabdev); |
| 436 | xendev->gnttabdev = NULL; |
| 437 | } |
| 438 | if (xendev->be_state != state) { |
| 439 | xen_be_set_state(xendev, state); |
| 440 | } |
| 441 | } |
| 442 | |
| 443 | /* |
| 444 | * Try to reset xendev, for reconnection by another frontend instance. |
| 445 | */ |
| 446 | static int xen_be_try_reset(struct XenLegacyDevice *xendev) |
| 447 | { |
| 448 | if (xendev->fe_state != XenbusStateInitialising) { |
| 449 | return -1; |
| 450 | } |
| 451 | |
| 452 | xen_pv_printf(xendev, 1, "device reset (for re-connect)\n"); |
| 453 | xen_be_set_state(xendev, XenbusStateInitialising); |
| 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | /* |
| 458 | * state change dispatcher function |
| 459 | */ |
| 460 | void xen_be_check_state(struct XenLegacyDevice *xendev) |
| 461 | { |
| 462 | int rc = 0; |
| 463 | |
| 464 | /* frontend may request shutdown from almost anywhere */ |
| 465 | if (xendev->fe_state == XenbusStateClosing || |
| 466 | xendev->fe_state == XenbusStateClosed) { |
| 467 | xen_be_disconnect(xendev, xendev->fe_state); |
| 468 | return; |
| 469 | } |
| 470 | |
| 471 | /* check for possible backend state transitions */ |
| 472 | for (;;) { |
| 473 | switch (xendev->be_state) { |
| 474 | case XenbusStateUnknown: |
| 475 | rc = xen_be_try_setup(xendev); |
| 476 | break; |
| 477 | case XenbusStateInitialising: |
| 478 | rc = xen_be_try_init(xendev); |
| 479 | break; |
| 480 | case XenbusStateInitWait: |
| 481 | rc = xen_be_try_initialise(xendev); |
| 482 | break; |
| 483 | case XenbusStateConnected: |
| 484 | /* xendev->be_state doesn't change */ |
| 485 | xen_be_try_connected(xendev); |
| 486 | rc = -1; |
| 487 | break; |
| 488 | case XenbusStateClosed: |
| 489 | rc = xen_be_try_reset(xendev); |
| 490 | break; |
| 491 | default: |
| 492 | rc = -1; |
| 493 | } |
| 494 | if (rc != 0) { |
| 495 | break; |
| 496 | } |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | /* ------------------------------------------------------------- */ |
| 501 | |
| 502 | struct xenstore_be { |
| 503 | const char *type; |
| 504 | int dom; |
| 505 | const struct XenDevOps *ops; |
| 506 | }; |
| 507 | |
| 508 | static void xenstore_update_be(void *opaque, const char *watch) |
| 509 | { |
| 510 | struct xenstore_be *be = opaque; |
| 511 | struct XenLegacyDevice *xendev; |
| 512 | char path[XEN_BUFSIZE], *bepath; |
| 513 | unsigned int len, dev; |
| 514 | |
| 515 | len = snprintf(path, sizeof(path), "backend/%s/%d", be->type, be->dom); |
| 516 | if (strncmp(path, watch, len) != 0) { |
| 517 | return; |
| 518 | } |
| 519 | if (sscanf(watch + len, "/%u/%255s", &dev, path) != 2) { |
| 520 | strcpy(path, ""); |
| 521 | if (sscanf(watch + len, "/%u", &dev) != 1) { |
| 522 | dev = -1; |
| 523 | } |
| 524 | } |
| 525 | if (dev == -1) { |
| 526 | return; |
| 527 | } |
| 528 | |
| 529 | xendev = xen_be_get_xendev(be->type, be->dom, dev, be->ops); |
| 530 | if (xendev != NULL) { |
| 531 | bepath = qemu_xen_xs_read(xenstore, 0, xendev->be, &len); |
| 532 | if (bepath == NULL) { |
| 533 | xen_pv_del_xendev(xendev); |
| 534 | } else { |
| 535 | free(bepath); |
| 536 | xen_be_backend_changed(xendev, path); |
| 537 | xen_be_check_state(xendev); |
| 538 | } |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | static int xenstore_scan(const char *type, int dom, const struct XenDevOps *ops) |
| 543 | { |
| 544 | struct XenLegacyDevice *xendev; |
| 545 | char path[XEN_BUFSIZE]; |
| 546 | struct xenstore_be *be = g_new0(struct xenstore_be, 1); |
| 547 | char **dev = NULL; |
| 548 | unsigned int cdev, j; |
| 549 | |
| 550 | /* setup watch */ |
| 551 | be->type = type; |
| 552 | be->dom = dom; |
| 553 | be->ops = ops; |
| 554 | snprintf(path, sizeof(path), "backend/%s/%d", type, dom); |
| 555 | if (!qemu_xen_xs_watch(xenstore, path, xenstore_update_be, be)) { |
| 556 | xen_pv_printf(NULL, 0, "xen be: watching backend path (%s) failed\n", |
| 557 | path); |
| 558 | return -1; |
| 559 | } |
| 560 | |
| 561 | /* look for backends */ |
| 562 | dev = qemu_xen_xs_directory(xenstore, 0, path, &cdev); |
| 563 | if (!dev) { |
| 564 | return 0; |
| 565 | } |
| 566 | for (j = 0; j < cdev; j++) { |
| 567 | xendev = xen_be_get_xendev(type, dom, atoi(dev[j]), ops); |
| 568 | if (xendev == NULL) { |
| 569 | continue; |
| 570 | } |
| 571 | xen_be_check_state(xendev); |
| 572 | } |
| 573 | free(dev); |
| 574 | return 0; |
| 575 | } |
| 576 | |
| 577 | /* -------------------------------------------------------------------- */ |
| 578 | |
| 579 | static void xen_set_dynamic_sysbus(void) |
| 580 | { |
| 581 | Object *machine = qdev_get_machine(); |
| 582 | ObjectClass *oc = object_get_class(machine); |
| 583 | MachineClass *mc = MACHINE_CLASS(oc); |
| 584 | |
| 585 | machine_class_allow_dynamic_sysbus_dev(mc, TYPE_XENSYSDEV); |
| 586 | } |
| 587 | |
| 588 | void xen_be_init(void) |
| 589 | { |
| 590 | xenstore = qemu_xen_xs_open(); |
| 591 | if (!xenstore) { |
| 592 | xen_pv_printf(NULL, 0, "can't connect to xenstored\n"); |
| 593 | exit(1); |
| 594 | } |
| 595 | |
| 596 | if (xen_evtchn_ops == NULL || xen_gnttab_ops == NULL) { |
| 597 | xen_pv_printf(NULL, 0, "Xen operations not set up\n"); |
| 598 | exit(1); |
| 599 | } |
| 600 | |
| 601 | xen_sysdev = qdev_new(TYPE_XENSYSDEV); |
| 602 | sysbus_realize_and_unref(SYS_BUS_DEVICE(xen_sysdev), &error_fatal); |
| 603 | xen_sysbus = qbus_new(TYPE_XENSYSBUS, xen_sysdev, "xen-sysbus"); |
| 604 | qbus_set_bus_hotplug_handler(xen_sysbus); |
| 605 | |
| 606 | xen_set_dynamic_sysbus(); |
| 607 | } |
| 608 | |
| 609 | int xen_be_register(const char *type, const struct XenDevOps *ops) |
| 610 | { |
| 611 | char path[50]; |
| 612 | |
| 613 | snprintf(path, sizeof(path), "device-model/%u/backends/%s", xen_domid, |
| 614 | type); |
| 615 | xenstore_mkdir(path, XS_PERM_NONE); |
| 616 | |
| 617 | return xenstore_scan(type, xen_domid, ops); |
| 618 | } |
| 619 | |
| 620 | int xen_be_bind_evtchn(struct XenLegacyDevice *xendev) |
| 621 | { |
| 622 | if (xendev->local_port != -1) { |
| 623 | return 0; |
| 624 | } |
| 625 | xendev->local_port = qemu_xen_evtchn_bind_interdomain |
| 626 | (xendev->evtchndev, xendev->dom, xendev->remote_port); |
| 627 | if (xendev->local_port == -1) { |
| 628 | xen_pv_printf(xendev, 0, "xenevtchn_bind_interdomain failed\n"); |
| 629 | return -1; |
| 630 | } |
| 631 | xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port); |
| 632 | qemu_set_fd_handler(qemu_xen_evtchn_fd(xendev->evtchndev), |
| 633 | xen_pv_evtchn_event, NULL, xendev); |
| 634 | return 0; |
| 635 | } |
| 636 | |
| 637 | |
| 638 | static void xendev_class_init(ObjectClass *klass, const void *data) |
| 639 | { |
| 640 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 641 | |
| 642 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
| 643 | dc->bus_type = TYPE_XENSYSBUS; |
| 644 | } |
| 645 | |
| 646 | static const TypeInfo xendev_type_info = { |
| 647 | .name = TYPE_XENBACKEND, |
| 648 | .parent = TYPE_DYNAMIC_SYS_BUS_DEVICE, |
| 649 | .class_init = xendev_class_init, |
| 650 | .instance_size = sizeof(XenLegacyDevice), |
| 651 | }; |
| 652 | |
| 653 | static void xen_sysbus_class_init(ObjectClass *klass, const void *data) |
| 654 | { |
| 655 | HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); |
| 656 | |
| 657 | hc->unplug = qdev_simple_device_unplug_cb; |
| 658 | } |
| 659 | |
| 660 | static const TypeInfo xensysbus_info = { |
| 661 | .name = TYPE_XENSYSBUS, |
| 662 | .parent = TYPE_BUS, |
| 663 | .class_init = xen_sysbus_class_init, |
| 664 | .interfaces = (const InterfaceInfo[]) { |
| 665 | { TYPE_HOTPLUG_HANDLER }, |
| 666 | { } |
| 667 | } |
| 668 | }; |
| 669 | |
| 670 | static const TypeInfo xensysdev_info = { |
| 671 | .name = TYPE_XENSYSDEV, |
| 672 | .parent = TYPE_SYS_BUS_DEVICE, |
| 673 | }; |
| 674 | |
| 675 | static void xenbe_register_types(void) |
| 676 | { |
| 677 | type_register_static(&xensysbus_info); |
| 678 | type_register_static(&xensysdev_info); |
| 679 | type_register_static(&xendev_type_info); |
| 680 | } |
| 681 | |
| 682 | type_init(xenbe_register_types) |