hw/xen/xen-legacy-backend.c

   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 #include <sys/signal.h>
  27
  28 #include "hw/hw.h"
  29 #include "hw/sysbus.h"
  30 #include "hw/boards.h"
  31 #include "qemu/log.h"
  32 #include "qapi/error.h"
  33 #include "hw/xen/xen-legacy-backend.h"
  34 #include "hw/xen/xen_pvdev.h"
  35 #include "monitor/qdev.h"
  36
  37 #include <xen/grant_table.h>
  38
  39 DeviceState *xen_sysdev;
  40 BusState *xen_sysbus;
  41
  42 /* ------------------------------------------------------------- */
  43
  44 /* public */
  45 struct xs_handle *xenstore;
  46 const char *xen_protocol;
  47
  48 /* private */
  49 static bool xen_feature_grant_copy;
  50 static int debug;
  51
  52 int xenstore_write_be_str(struct XenLegacyDevice *xendev, const char *node,
  53                           const char *val)
  54 {
  55     return xenstore_write_str(xendev->be, node, val);
  56 }
  57
  58 int xenstore_write_be_int(struct XenLegacyDevice *xendev, const char *node,
  59                           int ival)
  60 {
  61     return xenstore_write_int(xendev->be, node, ival);
  62 }
  63
  64 int xenstore_write_be_int64(struct XenLegacyDevice *xendev, const char *node,
  65                             int64_t ival)
  66 {
  67     return xenstore_write_int64(xendev->be, node, ival);
  68 }
  69
  70 char *xenstore_read_be_str(struct XenLegacyDevice *xendev, const char *node)
  71 {
  72     return xenstore_read_str(xendev->be, node);
  73 }
  74
  75 int xenstore_read_be_int(struct XenLegacyDevice *xendev, const char *node,
  76                          int *ival)
  77 {
  78     return xenstore_read_int(xendev->be, node, ival);
  79 }
  80
  81 char *xenstore_read_fe_str(struct XenLegacyDevice *xendev, const char *node)
  82 {
  83     return xenstore_read_str(xendev->fe, node);
  84 }
  85
  86 int xenstore_read_fe_int(struct XenLegacyDevice *xendev, const char *node,
  87                          int *ival)
  88 {
  89     return xenstore_read_int(xendev->fe, node, ival);
  90 }
  91
  92 int xenstore_read_fe_uint64(struct XenLegacyDevice *xendev, const char *node,
  93                             uint64_t *uval)
  94 {
  95     return xenstore_read_uint64(xendev->fe, node, uval);
  96 }
  97
  98 /* ------------------------------------------------------------- */
  99
 100 int xen_be_set_state(struct XenLegacyDevice *xendev, enum xenbus_state state)
 101 {
 102     int rc;
 103
 104     rc = xenstore_write_be_int(xendev, "state", state);
 105     if (rc < 0) {
 106         return rc;
 107     }
 108     xen_pv_printf(xendev, 1, "backend state: %s -> %s\n",
 109                   xenbus_strstate(xendev->be_state), xenbus_strstate(state));
 110     xendev->be_state = state;
 111     return 0;
 112 }
 113
 114 void xen_be_set_max_grant_refs(struct XenLegacyDevice *xendev,
 115                                unsigned int nr_refs)
 116 {
 117     assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
 118
 119     if (xengnttab_set_max_grants(xendev->gnttabdev, nr_refs)) {
 120         xen_pv_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n",
 121                       strerror(errno));
 122     }
 123 }
 124
 125 void *xen_be_map_grant_refs(struct XenLegacyDevice *xendev, uint32_t *refs,
 126                             unsigned int nr_refs, int prot)
 127 {
 128     void *ptr;
 129
 130     assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
 131
 132     ptr = xengnttab_map_domain_grant_refs(xendev->gnttabdev, nr_refs,
 133                                           xen_domid, refs, prot);
 134     if (!ptr) {
 135         xen_pv_printf(xendev, 0,
 136                       "xengnttab_map_domain_grant_refs failed: %s\n",
 137                       strerror(errno));
 138     }
 139
 140     return ptr;
 141 }
 142
 143 void xen_be_unmap_grant_refs(struct XenLegacyDevice *xendev, void *ptr,
 144                              unsigned int nr_refs)
 145 {
 146     assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
 147
 148     if (xengnttab_unmap(xendev->gnttabdev, ptr, nr_refs)) {
 149         xen_pv_printf(xendev, 0, "xengnttab_unmap failed: %s\n",
 150                       strerror(errno));
 151     }
 152 }
 153
 154 static int compat_copy_grant_refs(struct XenLegacyDevice *xendev,
 155                                   bool to_domain,
 156                                   XenGrantCopySegment segs[],
 157                                   unsigned int nr_segs)
 158 {
 159     uint32_t *refs = g_new(uint32_t, nr_segs);
 160     int prot = to_domain ? PROT_WRITE : PROT_READ;
 161     void *pages;
 162     unsigned int i;
 163
 164     for (i = 0; i < nr_segs; i++) {
 165         XenGrantCopySegment *seg = &segs[i];
 166
 167         refs[i] = to_domain ?
 168             seg->dest.foreign.ref : seg->source.foreign.ref;
 169     }
 170
 171     pages = xengnttab_map_domain_grant_refs(xendev->gnttabdev, nr_segs,
 172                                             xen_domid, refs, prot);
 173     if (!pages) {
 174         xen_pv_printf(xendev, 0,
 175                       "xengnttab_map_domain_grant_refs failed: %s\n",
 176                       strerror(errno));
 177         g_free(refs);
 178         return -1;
 179     }
 180
 181     for (i = 0; i < nr_segs; i++) {
 182         XenGrantCopySegment *seg = &segs[i];
 183         void *page = pages + (i * XC_PAGE_SIZE);
 184
 185         if (to_domain) {
 186             memcpy(page + seg->dest.foreign.offset, seg->source.virt,
 187                    seg->len);
 188         } else {
 189             memcpy(seg->dest.virt, page + seg->source.foreign.offset,
 190                    seg->len);
 191         }
 192     }
 193
 194     if (xengnttab_unmap(xendev->gnttabdev, pages, nr_segs)) {
 195         xen_pv_printf(xendev, 0, "xengnttab_unmap failed: %s\n",
 196                       strerror(errno));
 197     }
 198
 199     g_free(refs);
 200     return 0;
 201 }
 202
 203 int xen_be_copy_grant_refs(struct XenLegacyDevice *xendev,
 204                            bool to_domain,
 205                            XenGrantCopySegment segs[],
 206                            unsigned int nr_segs)
 207 {
 208     xengnttab_grant_copy_segment_t *xengnttab_segs;
 209     unsigned int i;
 210     int rc;
 211
 212     assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV);
 213
 214     if (!xen_feature_grant_copy) {
 215         return compat_copy_grant_refs(xendev, to_domain, segs, nr_segs);
 216     }
 217
 218     xengnttab_segs = g_new0(xengnttab_grant_copy_segment_t, nr_segs);
 219
 220     for (i = 0; i < nr_segs; i++) {
 221         XenGrantCopySegment *seg = &segs[i];
 222         xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i];
 223
 224         if (to_domain) {
 225             xengnttab_seg->flags = GNTCOPY_dest_gref;
 226             xengnttab_seg->dest.foreign.domid = xen_domid;
 227             xengnttab_seg->dest.foreign.ref = seg->dest.foreign.ref;
 228             xengnttab_seg->dest.foreign.offset = seg->dest.foreign.offset;
 229             xengnttab_seg->source.virt = seg->source.virt;
 230         } else {
 231             xengnttab_seg->flags = GNTCOPY_source_gref;
 232             xengnttab_seg->source.foreign.domid = xen_domid;
 233             xengnttab_seg->source.foreign.ref = seg->source.foreign.ref;
 234             xengnttab_seg->source.foreign.offset =
 235                 seg->source.foreign.offset;
 236             xengnttab_seg->dest.virt = seg->dest.virt;
 237         }
 238
 239         xengnttab_seg->len = seg->len;
 240     }
 241
 242     rc = xengnttab_grant_copy(xendev->gnttabdev, nr_segs, xengnttab_segs);
 243
 244     if (rc) {
 245         xen_pv_printf(xendev, 0, "xengnttab_copy failed: %s\n",
 246                       strerror(errno));
 247     }
 248
 249     for (i = 0; i < nr_segs; i++) {
 250         xengnttab_grant_copy_segment_t *xengnttab_seg =
 251             &xengnttab_segs[i];
 252
 253         if (xengnttab_seg->status != GNTST_okay) {
 254             xen_pv_printf(xendev, 0, "segment[%u] status: %d\n", i,
 255                           xengnttab_seg->status);
 256             rc = -1;
 257         }
 258     }
 259
 260     g_free(xengnttab_segs);
 261     return rc;
 262 }
 263
 264 /*
 265  * get xen backend device, allocate a new one if it doesn't exist.
 266  */
 267 static struct XenLegacyDevice *xen_be_get_xendev(const char *type, int dom,
 268                                                  int dev,
 269                                                  struct XenDevOps *ops)
 270 {
 271     struct XenLegacyDevice *xendev;
 272
 273     xendev = xen_pv_find_xendev(type, dom, dev);
 274     if (xendev) {
 275         return xendev;
 276     }
 277
 278     /* init new xendev */
 279     xendev = g_malloc0(ops->size);
 280     object_initialize(&xendev->qdev, ops->size, TYPE_XENBACKEND);
 281     OBJECT(xendev)->free = g_free;
 282     qdev_set_parent_bus(DEVICE(xendev), xen_sysbus);
 283     qdev_set_id(DEVICE(xendev), g_strdup_printf("xen-%s-%d", type, dev));
 284     qdev_init_nofail(DEVICE(xendev));
 285     object_unref(OBJECT(xendev));
 286
 287     xendev->type  = type;
 288     xendev->dom   = dom;
 289     xendev->dev   = dev;
 290     xendev->ops   = ops;
 291
 292     snprintf(xendev->be, sizeof(xendev->be), "backend/%s/%d/%d",
 293              xendev->type, xendev->dom, xendev->dev);
 294     snprintf(xendev->name, sizeof(xendev->name), "%s-%d",
 295              xendev->type, xendev->dev);
 296
 297     xendev->debug      = debug;
 298     xendev->local_port = -1;
 299
 300     xendev->evtchndev = xenevtchn_open(NULL, 0);
 301     if (xendev->evtchndev == NULL) {
 302         xen_pv_printf(NULL, 0, "can't open evtchn device\n");
 303         qdev_unplug(DEVICE(xendev), NULL);
 304         return NULL;
 305     }
 306     qemu_set_cloexec(xenevtchn_fd(xendev->evtchndev));
 307
 308     xen_pv_insert_xendev(xendev);
 309
 310     if (xendev->ops->alloc) {
 311         xendev->ops->alloc(xendev);
 312     }
 313
 314     return xendev;
 315 }
 316
 317
 318 /*
 319  * Sync internal data structures on xenstore updates.
 320  * Node specifies the changed field.  node = NULL means
 321  * update all fields (used for initialization).
 322  */
 323 static void xen_be_backend_changed(struct XenLegacyDevice *xendev,
 324                                    const char *node)
 325 {
 326     if (node == NULL  ||  strcmp(node, "online") == 0) {
 327         if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) {
 328             xendev->online = 0;
 329         }
 330     }
 331
 332     if (node) {
 333         xen_pv_printf(xendev, 2, "backend update: %s\n", node);
 334         if (xendev->ops->backend_changed) {
 335             xendev->ops->backend_changed(xendev, node);
 336         }
 337     }
 338 }
 339
 340 static void xen_be_frontend_changed(struct XenLegacyDevice *xendev,
 341                                     const char *node)
 342 {
 343     int fe_state;
 344
 345     if (node == NULL  ||  strcmp(node, "state") == 0) {
 346         if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) {
 347             fe_state = XenbusStateUnknown;
 348         }
 349         if (xendev->fe_state != fe_state) {
 350             xen_pv_printf(xendev, 1, "frontend state: %s -> %s\n",
 351                           xenbus_strstate(xendev->fe_state),
 352                           xenbus_strstate(fe_state));
 353         }
 354         xendev->fe_state = fe_state;
 355     }
 356     if (node == NULL  ||  strcmp(node, "protocol") == 0) {
 357         g_free(xendev->protocol);
 358         xendev->protocol = xenstore_read_fe_str(xendev, "protocol");
 359         if (xendev->protocol) {
 360             xen_pv_printf(xendev, 1, "frontend protocol: %s\n",
 361                           xendev->protocol);
 362         }
 363     }
 364
 365     if (node) {
 366         xen_pv_printf(xendev, 2, "frontend update: %s\n", node);
 367         if (xendev->ops->frontend_changed) {
 368             xendev->ops->frontend_changed(xendev, node);
 369         }
 370     }
 371 }
 372
 373 /* ------------------------------------------------------------- */
 374 /* Check for possible state transitions and perform them.        */
 375
 376 /*
 377  * Initial xendev setup.  Read frontend path, register watch for it.
 378  * Should succeed once xend finished setting up the backend device.
 379  *
 380  * Also sets initial state (-> Initializing) when done.  Which
 381  * only affects the xendev->be_state variable as xenbus should
 382  * already be put into that state by xend.
 383  */
 384 static int xen_be_try_setup(struct XenLegacyDevice *xendev)
 385 {
 386     char token[XEN_BUFSIZE];
 387     int be_state;
 388
 389     if (xenstore_read_be_int(xendev, "state", &be_state) == -1) {
 390         xen_pv_printf(xendev, 0, "reading backend state failed\n");
 391         return -1;
 392     }
 393
 394     if (be_state != XenbusStateInitialising) {
 395         xen_pv_printf(xendev, 0, "initial backend state is wrong (%s)\n",
 396                       xenbus_strstate(be_state));
 397         return -1;
 398     }
 399
 400     xendev->fe = xenstore_read_be_str(xendev, "frontend");
 401     if (xendev->fe == NULL) {
 402         xen_pv_printf(xendev, 0, "reading frontend path failed\n");
 403         return -1;
 404     }
 405
 406     /* setup frontend watch */
 407     snprintf(token, sizeof(token), "fe:%p", xendev);
 408     if (!xs_watch(xenstore, xendev->fe, token)) {
 409         xen_pv_printf(xendev, 0, "watching frontend path (%s) failed\n",
 410                       xendev->fe);
 411         return -1;
 412     }
 413     xen_be_set_state(xendev, XenbusStateInitialising);
 414
 415     xen_be_backend_changed(xendev, NULL);
 416     xen_be_frontend_changed(xendev, NULL);
 417     return 0;
 418 }
 419
 420 /*
 421  * Try initialize xendev.  Prepare everything the backend can do
 422  * without synchronizing with the frontend.  Fakes hotplug-status.  No
 423  * hotplug involved here because this is about userspace drivers, thus
 424  * there are kernel backend devices which could invoke hotplug.
 425  *
 426  * Goes to InitWait on success.
 427  */
 428 static int xen_be_try_init(struct XenLegacyDevice *xendev)
 429 {
 430     int rc = 0;
 431
 432     if (!xendev->online) {
 433         xen_pv_printf(xendev, 1, "not online\n");
 434         return -1;
 435     }
 436
 437     if (xendev->ops->init) {
 438         rc = xendev->ops->init(xendev);
 439     }
 440     if (rc != 0) {
 441         xen_pv_printf(xendev, 1, "init() failed\n");
 442         return rc;
 443     }
 444
 445     xenstore_write_be_str(xendev, "hotplug-status", "connected");
 446     xen_be_set_state(xendev, XenbusStateInitWait);
 447     return 0;
 448 }
 449
 450 /*
 451  * Try to initialise xendev.  Depends on the frontend being ready
 452  * for it (shared ring and evtchn info in xenstore, state being
 453  * Initialised or Connected).
 454  *
 455  * Goes to Connected on success.
 456  */
 457 static int xen_be_try_initialise(struct XenLegacyDevice *xendev)
 458 {
 459     int rc = 0;
 460
 461     if (xendev->fe_state != XenbusStateInitialised  &&
 462         xendev->fe_state != XenbusStateConnected) {
 463         if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
 464             xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n");
 465         } else {
 466             xen_pv_printf(xendev, 2, "frontend not ready (yet)\n");
 467             return -1;
 468         }
 469     }
 470
 471     if (xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV) {
 472         xendev->gnttabdev = xengnttab_open(NULL, 0);
 473         if (xendev->gnttabdev == NULL) {
 474             xen_pv_printf(NULL, 0, "can't open gnttab device\n");
 475             return -1;
 476         }
 477     } else {
 478         xendev->gnttabdev = NULL;
 479     }
 480
 481     if (xendev->ops->initialise) {
 482         rc = xendev->ops->initialise(xendev);
 483     }
 484     if (rc != 0) {
 485         xen_pv_printf(xendev, 0, "initialise() failed\n");
 486         return rc;
 487     }
 488
 489     xen_be_set_state(xendev, XenbusStateConnected);
 490     return 0;
 491 }
 492
 493 /*
 494  * Try to let xendev know that it is connected.  Depends on the
 495  * frontend being Connected.  Note that this may be called more
 496  * than once since the backend state is not modified.
 497  */
 498 static void xen_be_try_connected(struct XenLegacyDevice *xendev)
 499 {
 500     if (!xendev->ops->connected) {
 501         return;
 502     }
 503
 504     if (xendev->fe_state != XenbusStateConnected) {
 505         if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
 506             xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n");
 507         } else {
 508             xen_pv_printf(xendev, 2, "frontend not ready (yet)\n");
 509             return;
 510         }
 511     }
 512
 513     xendev->ops->connected(xendev);
 514 }
 515
 516 /*
 517  * Teardown connection.
 518  *
 519  * Goes to Closed when done.
 520  */
 521 static void xen_be_disconnect(struct XenLegacyDevice *xendev,
 522                               enum xenbus_state state)
 523 {
 524     if (xendev->be_state != XenbusStateClosing &&
 525         xendev->be_state != XenbusStateClosed  &&
 526         xendev->ops->disconnect) {
 527         xendev->ops->disconnect(xendev);
 528     }
 529     if (xendev->gnttabdev) {
 530         xengnttab_close(xendev->gnttabdev);
 531         xendev->gnttabdev = NULL;
 532     }
 533     if (xendev->be_state != state) {
 534         xen_be_set_state(xendev, state);
 535     }
 536 }
 537
 538 /*
 539  * Try to reset xendev, for reconnection by another frontend instance.
 540  */
 541 static int xen_be_try_reset(struct XenLegacyDevice *xendev)
 542 {
 543     if (xendev->fe_state != XenbusStateInitialising) {
 544         return -1;
 545     }
 546
 547     xen_pv_printf(xendev, 1, "device reset (for re-connect)\n");
 548     xen_be_set_state(xendev, XenbusStateInitialising);
 549     return 0;
 550 }
 551
 552 /*
 553  * state change dispatcher function
 554  */
 555 void xen_be_check_state(struct XenLegacyDevice *xendev)
 556 {
 557     int rc = 0;
 558
 559     /* frontend may request shutdown from almost anywhere */
 560     if (xendev->fe_state == XenbusStateClosing ||
 561         xendev->fe_state == XenbusStateClosed) {
 562         xen_be_disconnect(xendev, xendev->fe_state);
 563         return;
 564     }
 565
 566     /* check for possible backend state transitions */
 567     for (;;) {
 568         switch (xendev->be_state) {
 569         case XenbusStateUnknown:
 570             rc = xen_be_try_setup(xendev);
 571             break;
 572         case XenbusStateInitialising:
 573             rc = xen_be_try_init(xendev);
 574             break;
 575         case XenbusStateInitWait:
 576             rc = xen_be_try_initialise(xendev);
 577             break;
 578         case XenbusStateConnected:
 579             /* xendev->be_state doesn't change */
 580             xen_be_try_connected(xendev);
 581             rc = -1;
 582             break;
 583         case XenbusStateClosed:
 584             rc = xen_be_try_reset(xendev);
 585             break;
 586         default:
 587             rc = -1;
 588         }
 589         if (rc != 0) {
 590             break;
 591         }
 592     }
 593 }
 594
 595 /* ------------------------------------------------------------- */
 596
 597 static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops)
 598 {
 599     struct XenLegacyDevice *xendev;
 600     char path[XEN_BUFSIZE], token[XEN_BUFSIZE];
 601     char **dev = NULL;
 602     unsigned int cdev, j;
 603
 604     /* setup watch */
 605     snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops);
 606     snprintf(path, sizeof(path), "backend/%s/%d", type, dom);
 607     if (!xs_watch(xenstore, path, token)) {
 608         xen_pv_printf(NULL, 0, "xen be: watching backend path (%s) failed\n",
 609                       path);
 610         return -1;
 611     }
 612
 613     /* look for backends */
 614     dev = xs_directory(xenstore, 0, path, &cdev);
 615     if (!dev) {
 616         return 0;
 617     }
 618     for (j = 0; j < cdev; j++) {
 619         xendev = xen_be_get_xendev(type, dom, atoi(dev[j]), ops);
 620         if (xendev == NULL) {
 621             continue;
 622         }
 623         xen_be_check_state(xendev);
 624     }
 625     free(dev);
 626     return 0;
 627 }
 628
 629 void xenstore_update_be(char *watch, char *type, int dom,
 630                         struct XenDevOps *ops)
 631 {
 632     struct XenLegacyDevice *xendev;
 633     char path[XEN_BUFSIZE], *bepath;
 634     unsigned int len, dev;
 635
 636     len = snprintf(path, sizeof(path), "backend/%s/%d", type, dom);
 637     if (strncmp(path, watch, len) != 0) {
 638         return;
 639     }
 640     if (sscanf(watch + len, "/%u/%255s", &dev, path) != 2) {
 641         strcpy(path, "");
 642         if (sscanf(watch + len, "/%u", &dev) != 1) {
 643             dev = -1;
 644         }
 645     }
 646     if (dev == -1) {
 647         return;
 648     }
 649
 650     xendev = xen_be_get_xendev(type, dom, dev, ops);
 651     if (xendev != NULL) {
 652         bepath = xs_read(xenstore, 0, xendev->be, &len);
 653         if (bepath == NULL) {
 654             xen_pv_del_xendev(xendev);
 655         } else {
 656             free(bepath);
 657             xen_be_backend_changed(xendev, path);
 658             xen_be_check_state(xendev);
 659         }
 660     }
 661 }
 662
 663 void xenstore_update_fe(char *watch, struct XenLegacyDevice *xendev)
 664 {
 665     char *node;
 666     unsigned int len;
 667
 668     len = strlen(xendev->fe);
 669     if (strncmp(xendev->fe, watch, len) != 0) {
 670         return;
 671     }
 672     if (watch[len] != '/') {
 673         return;
 674     }
 675     node = watch + len + 1;
 676
 677     xen_be_frontend_changed(xendev, node);
 678     xen_be_check_state(xendev);
 679 }
 680 /* -------------------------------------------------------------------- */
 681
 682 int xen_be_init(void)
 683 {
 684     xengnttab_handle *gnttabdev;
 685
 686     xenstore = xs_daemon_open();
 687     if (!xenstore) {
 688         xen_pv_printf(NULL, 0, "can't connect to xenstored\n");
 689         return -1;
 690     }
 691
 692     qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL);
 693
 694     if (xen_xc == NULL || xen_fmem == NULL) {
 695         /* Check if xen_init() have been called */
 696         goto err;
 697     }
 698
 699     gnttabdev = xengnttab_open(NULL, 0);
 700     if (gnttabdev != NULL) {
 701         if (xengnttab_grant_copy(gnttabdev, 0, NULL) == 0) {
 702             xen_feature_grant_copy = true;
 703         }
 704         xengnttab_close(gnttabdev);
 705     }
 706
 707     xen_sysdev = qdev_create(NULL, TYPE_XENSYSDEV);
 708     qdev_init_nofail(xen_sysdev);
 709     xen_sysbus = qbus_create(TYPE_XENSYSBUS, DEVICE(xen_sysdev), "xen-sysbus");
 710     qbus_set_bus_hotplug_handler(xen_sysbus, &error_abort);
 711
 712     return 0;
 713
 714 err:
 715     qemu_set_fd_handler(xs_fileno(xenstore), NULL, NULL, NULL);
 716     xs_daemon_close(xenstore);
 717     xenstore = NULL;
 718
 719     return -1;
 720 }
 721
 722 static void xen_set_dynamic_sysbus(void)
 723 {
 724     Object *machine = qdev_get_machine();
 725     ObjectClass *oc = object_get_class(machine);
 726     MachineClass *mc = MACHINE_CLASS(oc);
 727
 728     machine_class_allow_dynamic_sysbus_dev(mc, TYPE_XENSYSDEV);
 729 }
 730
 731 int xen_be_register(const char *type, struct XenDevOps *ops)
 732 {
 733     char path[50];
 734     int rc;
 735
 736     if (ops->backend_register) {
 737         rc = ops->backend_register();
 738         if (rc) {
 739             return rc;
 740         }
 741     }
 742
 743     snprintf(path, sizeof(path), "device-model/%u/backends/%s", xen_domid,
 744              type);
 745     xenstore_mkdir(path, XS_PERM_NONE);
 746
 747     return xenstore_scan(type, xen_domid, ops);
 748 }
 749
 750 void xen_be_register_common(void)
 751 {
 752     xen_set_dynamic_sysbus();
 753
 754     xen_be_register("console", &xen_console_ops);
 755     xen_be_register("vkbd", &xen_kbdmouse_ops);
 756 #ifdef CONFIG_VIRTFS
 757     xen_be_register("9pfs", &xen_9pfs_ops);
 758 #endif
 759 #ifdef CONFIG_USB_LIBUSB
 760     xen_be_register("qusb", &xen_usb_ops);
 761 #endif
 762 }
 763
 764 int xen_be_bind_evtchn(struct XenLegacyDevice *xendev)
 765 {
 766     if (xendev->local_port != -1) {
 767         return 0;
 768     }
 769     xendev->local_port = xenevtchn_bind_interdomain
 770         (xendev->evtchndev, xendev->dom, xendev->remote_port);
 771     if (xendev->local_port == -1) {
 772         xen_pv_printf(xendev, 0, "xenevtchn_bind_interdomain failed\n");
 773         return -1;
 774     }
 775     xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
 776     qemu_set_fd_handler(xenevtchn_fd(xendev->evtchndev),
 777                         xen_pv_evtchn_event, NULL, xendev);
 778     return 0;
 779 }
 780
 781
 782 static Property xendev_properties[] = {
 783     DEFINE_PROP_END_OF_LIST(),
 784 };
 785
 786 static void xendev_class_init(ObjectClass *klass, void *data)
 787 {
 788     DeviceClass *dc = DEVICE_CLASS(klass);
 789
 790     dc->props = xendev_properties;
 791     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 792     /* xen-backend devices can be plugged/unplugged dynamically */
 793     dc->user_creatable = true;
 794 }
 795
 796 static const TypeInfo xendev_type_info = {
 797     .name          = TYPE_XENBACKEND,
 798     .parent        = TYPE_XENSYSDEV,
 799     .class_init    = xendev_class_init,
 800     .instance_size = sizeof(struct XenLegacyDevice),
 801 };
 802
 803 static void xen_sysbus_class_init(ObjectClass *klass, void *data)
 804 {
 805     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
 806
 807     hc->unplug = qdev_simple_device_unplug_cb;
 808 }
 809
 810 static const TypeInfo xensysbus_info = {
 811     .name       = TYPE_XENSYSBUS,
 812     .parent     = TYPE_BUS,
 813     .class_init = xen_sysbus_class_init,
 814     .interfaces = (InterfaceInfo[]) {
 815         { TYPE_HOTPLUG_HANDLER },
 816         { }
 817     }
 818 };
 819
 820 static Property xen_sysdev_properties[] = {
 821     {/* end of property list */},
 822 };
 823
 824 static void xen_sysdev_class_init(ObjectClass *klass, void *data)
 825 {
 826     DeviceClass *dc = DEVICE_CLASS(klass);
 827
 828     dc->props = xen_sysdev_properties;
 829     dc->bus_type = TYPE_XENSYSBUS;
 830 }
 831
 832 static const TypeInfo xensysdev_info = {
 833     .name          = TYPE_XENSYSDEV,
 834     .parent        = TYPE_SYS_BUS_DEVICE,
 835     .instance_size = sizeof(SysBusDevice),
 836     .class_init    = xen_sysdev_class_init,
 837 };
 838
 839 static void xenbe_register_types(void)
 840 {
 841     type_register_static(&xensysbus_info);
 842     type_register_static(&xensysdev_info);
 843     type_register_static(&xendev_type_info);
 844 }
 845
 846 type_init(xenbe_register_types)