| /* |
| * xen backend driver infrastructure |
| * (c) 2008 Gerd Hoffmann <kraxel@redhat.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; under version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, see <http://www.gnu.org/licenses/>. |
| * |
| * Contributions after 2012-01-13 are licensed under the terms of the |
| * GNU GPL, version 2 or (at your option) any later version. |
| */ |
| |
| /* |
| * TODO: add some xenbus / xenstore concepts overview here. |
| */ |
| |
| #include "qemu/osdep.h" |
| |
| #include "hw/sysbus.h" |
| #include "hw/boards.h" |
| #include "hw/qdev-properties.h" |
| #include "qemu/main-loop.h" |
| #include "qapi/error.h" |
| #include "hw/xen/xen-legacy-backend.h" |
| #include "hw/xen/xen_pvdev.h" |
| #include "monitor/qdev.h" |
| |
| DeviceState *xen_sysdev; |
| BusState *xen_sysbus; |
| |
| /* ------------------------------------------------------------- */ |
| |
| /* public */ |
| struct xs_handle *xenstore; |
| const char *xen_protocol; |
| |
| /* private */ |
| static bool xen_feature_grant_copy; |
| static int debug; |
| |
| int xenstore_write_be_str(struct XenLegacyDevice *xendev, const char *node, |
| const char *val) |
| { |
| return xenstore_write_str(xendev->be, node, val); |
| } |
| |
| int xenstore_write_be_int(struct XenLegacyDevice *xendev, const char *node, |
| int ival) |
| { |
| return xenstore_write_int(xendev->be, node, ival); |
| } |
| |
| int xenstore_write_be_int64(struct XenLegacyDevice *xendev, const char *node, |
| int64_t ival) |
| { |
| return xenstore_write_int64(xendev->be, node, ival); |
| } |
| |
| char *xenstore_read_be_str(struct XenLegacyDevice *xendev, const char *node) |
| { |
| return xenstore_read_str(xendev->be, node); |
| } |
| |
| int xenstore_read_be_int(struct XenLegacyDevice *xendev, const char *node, |
| int *ival) |
| { |
| return xenstore_read_int(xendev->be, node, ival); |
| } |
| |
| char *xenstore_read_fe_str(struct XenLegacyDevice *xendev, const char *node) |
| { |
| return xenstore_read_str(xendev->fe, node); |
| } |
| |
| int xenstore_read_fe_int(struct XenLegacyDevice *xendev, const char *node, |
| int *ival) |
| { |
| return xenstore_read_int(xendev->fe, node, ival); |
| } |
| |
| int xenstore_read_fe_uint64(struct XenLegacyDevice *xendev, const char *node, |
| uint64_t *uval) |
| { |
| return xenstore_read_uint64(xendev->fe, node, uval); |
| } |
| |
| /* ------------------------------------------------------------- */ |
| |
| int xen_be_set_state(struct XenLegacyDevice *xendev, enum xenbus_state state) |
| { |
| int rc; |
| |
| rc = xenstore_write_be_int(xendev, "state", state); |
| if (rc < 0) { |
| return rc; |
| } |
| xen_pv_printf(xendev, 1, "backend state: %s -> %s\n", |
| xenbus_strstate(xendev->be_state), xenbus_strstate(state)); |
| xendev->be_state = state; |
| return 0; |
| } |
| |
| void xen_be_set_max_grant_refs(struct XenLegacyDevice *xendev, |
| unsigned int nr_refs) |
| { |
| assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV); |
| |
| if (xengnttab_set_max_grants(xendev->gnttabdev, nr_refs)) { |
| xen_pv_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n", |
| strerror(errno)); |
| } |
| } |
| |
| void *xen_be_map_grant_refs(struct XenLegacyDevice *xendev, uint32_t *refs, |
| unsigned int nr_refs, int prot) |
| { |
| void *ptr; |
| |
| assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV); |
| |
| ptr = xengnttab_map_domain_grant_refs(xendev->gnttabdev, nr_refs, |
| xen_domid, refs, prot); |
| if (!ptr) { |
| xen_pv_printf(xendev, 0, |
| "xengnttab_map_domain_grant_refs failed: %s\n", |
| strerror(errno)); |
| } |
| |
| return ptr; |
| } |
| |
| void xen_be_unmap_grant_refs(struct XenLegacyDevice *xendev, void *ptr, |
| unsigned int nr_refs) |
| { |
| assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV); |
| |
| if (xengnttab_unmap(xendev->gnttabdev, ptr, nr_refs)) { |
| xen_pv_printf(xendev, 0, "xengnttab_unmap failed: %s\n", |
| strerror(errno)); |
| } |
| } |
| |
| static int compat_copy_grant_refs(struct XenLegacyDevice *xendev, |
| bool to_domain, |
| XenGrantCopySegment segs[], |
| unsigned int nr_segs) |
| { |
| uint32_t *refs = g_new(uint32_t, nr_segs); |
| int prot = to_domain ? PROT_WRITE : PROT_READ; |
| void *pages; |
| unsigned int i; |
| |
| for (i = 0; i < nr_segs; i++) { |
| XenGrantCopySegment *seg = &segs[i]; |
| |
| refs[i] = to_domain ? |
| seg->dest.foreign.ref : seg->source.foreign.ref; |
| } |
| |
| pages = xengnttab_map_domain_grant_refs(xendev->gnttabdev, nr_segs, |
| xen_domid, refs, prot); |
| if (!pages) { |
| xen_pv_printf(xendev, 0, |
| "xengnttab_map_domain_grant_refs failed: %s\n", |
| strerror(errno)); |
| g_free(refs); |
| return -1; |
| } |
| |
| for (i = 0; i < nr_segs; i++) { |
| XenGrantCopySegment *seg = &segs[i]; |
| void *page = pages + (i * XC_PAGE_SIZE); |
| |
| if (to_domain) { |
| memcpy(page + seg->dest.foreign.offset, seg->source.virt, |
| seg->len); |
| } else { |
| memcpy(seg->dest.virt, page + seg->source.foreign.offset, |
| seg->len); |
| } |
| } |
| |
| if (xengnttab_unmap(xendev->gnttabdev, pages, nr_segs)) { |
| xen_pv_printf(xendev, 0, "xengnttab_unmap failed: %s\n", |
| strerror(errno)); |
| } |
| |
| g_free(refs); |
| return 0; |
| } |
| |
| int xen_be_copy_grant_refs(struct XenLegacyDevice *xendev, |
| bool to_domain, |
| XenGrantCopySegment segs[], |
| unsigned int nr_segs) |
| { |
| xengnttab_grant_copy_segment_t *xengnttab_segs; |
| unsigned int i; |
| int rc; |
| |
| assert(xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV); |
| |
| if (!xen_feature_grant_copy) { |
| return compat_copy_grant_refs(xendev, to_domain, segs, nr_segs); |
| } |
| |
| xengnttab_segs = g_new0(xengnttab_grant_copy_segment_t, nr_segs); |
| |
| for (i = 0; i < nr_segs; i++) { |
| XenGrantCopySegment *seg = &segs[i]; |
| xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i]; |
| |
| if (to_domain) { |
| xengnttab_seg->flags = GNTCOPY_dest_gref; |
| xengnttab_seg->dest.foreign.domid = xen_domid; |
| xengnttab_seg->dest.foreign.ref = seg->dest.foreign.ref; |
| xengnttab_seg->dest.foreign.offset = seg->dest.foreign.offset; |
| xengnttab_seg->source.virt = seg->source.virt; |
| } else { |
| xengnttab_seg->flags = GNTCOPY_source_gref; |
| xengnttab_seg->source.foreign.domid = xen_domid; |
| xengnttab_seg->source.foreign.ref = seg->source.foreign.ref; |
| xengnttab_seg->source.foreign.offset = |
| seg->source.foreign.offset; |
| xengnttab_seg->dest.virt = seg->dest.virt; |
| } |
| |
| xengnttab_seg->len = seg->len; |
| } |
| |
| rc = xengnttab_grant_copy(xendev->gnttabdev, nr_segs, xengnttab_segs); |
| |
| if (rc) { |
| xen_pv_printf(xendev, 0, "xengnttab_copy failed: %s\n", |
| strerror(errno)); |
| } |
| |
| for (i = 0; i < nr_segs; i++) { |
| xengnttab_grant_copy_segment_t *xengnttab_seg = |
| &xengnttab_segs[i]; |
| |
| if (xengnttab_seg->status != GNTST_okay) { |
| xen_pv_printf(xendev, 0, "segment[%u] status: %d\n", i, |
| xengnttab_seg->status); |
| rc = -1; |
| } |
| } |
| |
| g_free(xengnttab_segs); |
| return rc; |
| } |
| |
| /* |
| * get xen backend device, allocate a new one if it doesn't exist. |
| */ |
| static struct XenLegacyDevice *xen_be_get_xendev(const char *type, int dom, |
| int dev, |
| struct XenDevOps *ops) |
| { |
| struct XenLegacyDevice *xendev; |
| |
| xendev = xen_pv_find_xendev(type, dom, dev); |
| if (xendev) { |
| return xendev; |
| } |
| |
| /* init new xendev */ |
| xendev = g_malloc0(ops->size); |
| object_initialize(&xendev->qdev, ops->size, TYPE_XENBACKEND); |
| OBJECT(xendev)->free = g_free; |
| qdev_set_id(DEVICE(xendev), g_strdup_printf("xen-%s-%d", type, dev), |
| &error_fatal); |
| qdev_realize(DEVICE(xendev), xen_sysbus, &error_fatal); |
| object_unref(OBJECT(xendev)); |
| |
| xendev->type = type; |
| xendev->dom = dom; |
| xendev->dev = dev; |
| xendev->ops = ops; |
| |
| snprintf(xendev->be, sizeof(xendev->be), "backend/%s/%d/%d", |
| xendev->type, xendev->dom, xendev->dev); |
| snprintf(xendev->name, sizeof(xendev->name), "%s-%d", |
| xendev->type, xendev->dev); |
| |
| xendev->debug = debug; |
| xendev->local_port = -1; |
| |
| xendev->evtchndev = xenevtchn_open(NULL, 0); |
| if (xendev->evtchndev == NULL) { |
| xen_pv_printf(NULL, 0, "can't open evtchn device\n"); |
| qdev_unplug(DEVICE(xendev), NULL); |
| return NULL; |
| } |
| qemu_set_cloexec(xenevtchn_fd(xendev->evtchndev)); |
| |
| xen_pv_insert_xendev(xendev); |
| |
| if (xendev->ops->alloc) { |
| xendev->ops->alloc(xendev); |
| } |
| |
| return xendev; |
| } |
| |
| |
| /* |
| * Sync internal data structures on xenstore updates. |
| * Node specifies the changed field. node = NULL means |
| * update all fields (used for initialization). |
| */ |
| static void xen_be_backend_changed(struct XenLegacyDevice *xendev, |
| const char *node) |
| { |
| if (node == NULL || strcmp(node, "online") == 0) { |
| if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) { |
| xendev->online = 0; |
| } |
| } |
| |
| if (node) { |
| xen_pv_printf(xendev, 2, "backend update: %s\n", node); |
| if (xendev->ops->backend_changed) { |
| xendev->ops->backend_changed(xendev, node); |
| } |
| } |
| } |
| |
| static void xen_be_frontend_changed(struct XenLegacyDevice *xendev, |
| const char *node) |
| { |
| int fe_state; |
| |
| if (node == NULL || strcmp(node, "state") == 0) { |
| if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) { |
| fe_state = XenbusStateUnknown; |
| } |
| if (xendev->fe_state != fe_state) { |
| xen_pv_printf(xendev, 1, "frontend state: %s -> %s\n", |
| xenbus_strstate(xendev->fe_state), |
| xenbus_strstate(fe_state)); |
| } |
| xendev->fe_state = fe_state; |
| } |
| if (node == NULL || strcmp(node, "protocol") == 0) { |
| g_free(xendev->protocol); |
| xendev->protocol = xenstore_read_fe_str(xendev, "protocol"); |
| if (xendev->protocol) { |
| xen_pv_printf(xendev, 1, "frontend protocol: %s\n", |
| xendev->protocol); |
| } |
| } |
| |
| if (node) { |
| xen_pv_printf(xendev, 2, "frontend update: %s\n", node); |
| if (xendev->ops->frontend_changed) { |
| xendev->ops->frontend_changed(xendev, node); |
| } |
| } |
| } |
| |
| /* ------------------------------------------------------------- */ |
| /* Check for possible state transitions and perform them. */ |
| |
| /* |
| * Initial xendev setup. Read frontend path, register watch for it. |
| * Should succeed once xend finished setting up the backend device. |
| * |
| * Also sets initial state (-> Initializing) when done. Which |
| * only affects the xendev->be_state variable as xenbus should |
| * already be put into that state by xend. |
| */ |
| static int xen_be_try_setup(struct XenLegacyDevice *xendev) |
| { |
| char token[XEN_BUFSIZE]; |
| int be_state; |
| |
| if (xenstore_read_be_int(xendev, "state", &be_state) == -1) { |
| xen_pv_printf(xendev, 0, "reading backend state failed\n"); |
| return -1; |
| } |
| |
| if (be_state != XenbusStateInitialising) { |
| xen_pv_printf(xendev, 0, "initial backend state is wrong (%s)\n", |
| xenbus_strstate(be_state)); |
| return -1; |
| } |
| |
| xendev->fe = xenstore_read_be_str(xendev, "frontend"); |
| if (xendev->fe == NULL) { |
| xen_pv_printf(xendev, 0, "reading frontend path failed\n"); |
| return -1; |
| } |
| |
| /* setup frontend watch */ |
| snprintf(token, sizeof(token), "fe:%p", xendev); |
| if (!xs_watch(xenstore, xendev->fe, token)) { |
| xen_pv_printf(xendev, 0, "watching frontend path (%s) failed\n", |
| xendev->fe); |
| return -1; |
| } |
| xen_be_set_state(xendev, XenbusStateInitialising); |
| |
| xen_be_backend_changed(xendev, NULL); |
| xen_be_frontend_changed(xendev, NULL); |
| return 0; |
| } |
| |
| /* |
| * Try initialize xendev. Prepare everything the backend can do |
| * without synchronizing with the frontend. Fakes hotplug-status. No |
| * hotplug involved here because this is about userspace drivers, thus |
| * there are kernel backend devices which could invoke hotplug. |
| * |
| * Goes to InitWait on success. |
| */ |
| static int xen_be_try_init(struct XenLegacyDevice *xendev) |
| { |
| int rc = 0; |
| |
| if (!xendev->online) { |
| xen_pv_printf(xendev, 1, "not online\n"); |
| return -1; |
| } |
| |
| if (xendev->ops->init) { |
| rc = xendev->ops->init(xendev); |
| } |
| if (rc != 0) { |
| xen_pv_printf(xendev, 1, "init() failed\n"); |
| return rc; |
| } |
| |
| xenstore_write_be_str(xendev, "hotplug-status", "connected"); |
| xen_be_set_state(xendev, XenbusStateInitWait); |
| return 0; |
| } |
| |
| /* |
| * Try to initialise xendev. Depends on the frontend being ready |
| * for it (shared ring and evtchn info in xenstore, state being |
| * Initialised or Connected). |
| * |
| * Goes to Connected on success. |
| */ |
| static int xen_be_try_initialise(struct XenLegacyDevice *xendev) |
| { |
| int rc = 0; |
| |
| if (xendev->fe_state != XenbusStateInitialised && |
| xendev->fe_state != XenbusStateConnected) { |
| if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) { |
| xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n"); |
| } else { |
| xen_pv_printf(xendev, 2, "frontend not ready (yet)\n"); |
| return -1; |
| } |
| } |
| |
| if (xendev->ops->flags & DEVOPS_FLAG_NEED_GNTDEV) { |
| xendev->gnttabdev = xengnttab_open(NULL, 0); |
| if (xendev->gnttabdev == NULL) { |
| xen_pv_printf(NULL, 0, "can't open gnttab device\n"); |
| return -1; |
| } |
| } else { |
| xendev->gnttabdev = NULL; |
| } |
| |
| if (xendev->ops->initialise) { |
| rc = xendev->ops->initialise(xendev); |
| } |
| if (rc != 0) { |
| xen_pv_printf(xendev, 0, "initialise() failed\n"); |
| return rc; |
| } |
| |
| xen_be_set_state(xendev, XenbusStateConnected); |
| return 0; |
| } |
| |
| /* |
| * Try to let xendev know that it is connected. Depends on the |
| * frontend being Connected. Note that this may be called more |
| * than once since the backend state is not modified. |
| */ |
| static void xen_be_try_connected(struct XenLegacyDevice *xendev) |
| { |
| if (!xendev->ops->connected) { |
| return; |
| } |
| |
| if (xendev->fe_state != XenbusStateConnected) { |
| if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) { |
| xen_pv_printf(xendev, 2, "frontend not ready, ignoring\n"); |
| } else { |
| xen_pv_printf(xendev, 2, "frontend not ready (yet)\n"); |
| return; |
| } |
| } |
| |
| xendev->ops->connected(xendev); |
| } |
| |
| /* |
| * Teardown connection. |
| * |
| * Goes to Closed when done. |
| */ |
| static void xen_be_disconnect(struct XenLegacyDevice *xendev, |
| enum xenbus_state state) |
| { |
| if (xendev->be_state != XenbusStateClosing && |
| xendev->be_state != XenbusStateClosed && |
| xendev->ops->disconnect) { |
| xendev->ops->disconnect(xendev); |
| } |
| if (xendev->gnttabdev) { |
| xengnttab_close(xendev->gnttabdev); |
| xendev->gnttabdev = NULL; |
| } |
| if (xendev->be_state != state) { |
| xen_be_set_state(xendev, state); |
| } |
| } |
| |
| /* |
| * Try to reset xendev, for reconnection by another frontend instance. |
| */ |
| static int xen_be_try_reset(struct XenLegacyDevice *xendev) |
| { |
| if (xendev->fe_state != XenbusStateInitialising) { |
| return -1; |
| } |
| |
| xen_pv_printf(xendev, 1, "device reset (for re-connect)\n"); |
| xen_be_set_state(xendev, XenbusStateInitialising); |
| return 0; |
| } |
| |
| /* |
| * state change dispatcher function |
| */ |
| void xen_be_check_state(struct XenLegacyDevice *xendev) |
| { |
| int rc = 0; |
| |
| /* frontend may request shutdown from almost anywhere */ |
| if (xendev->fe_state == XenbusStateClosing || |
| xendev->fe_state == XenbusStateClosed) { |
| xen_be_disconnect(xendev, xendev->fe_state); |
| return; |
| } |
| |
| /* check for possible backend state transitions */ |
| for (;;) { |
| switch (xendev->be_state) { |
| case XenbusStateUnknown: |
| rc = xen_be_try_setup(xendev); |
| break; |
| case XenbusStateInitialising: |
| rc = xen_be_try_init(xendev); |
| break; |
| case XenbusStateInitWait: |
| rc = xen_be_try_initialise(xendev); |
| break; |
| case XenbusStateConnected: |
| /* xendev->be_state doesn't change */ |
| xen_be_try_connected(xendev); |
| rc = -1; |
| break; |
| case XenbusStateClosed: |
| rc = xen_be_try_reset(xendev); |
| break; |
| default: |
| rc = -1; |
| } |
| if (rc != 0) { |
| break; |
| } |
| } |
| } |
| |
| /* ------------------------------------------------------------- */ |
| |
| static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops) |
| { |
| struct XenLegacyDevice *xendev; |
| char path[XEN_BUFSIZE], token[XEN_BUFSIZE]; |
| char **dev = NULL; |
| unsigned int cdev, j; |
| |
| /* setup watch */ |
| snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops); |
| snprintf(path, sizeof(path), "backend/%s/%d", type, dom); |
| if (!xs_watch(xenstore, path, token)) { |
| xen_pv_printf(NULL, 0, "xen be: watching backend path (%s) failed\n", |
| path); |
| return -1; |
| } |
| |
| /* look for backends */ |
| dev = xs_directory(xenstore, 0, path, &cdev); |
| if (!dev) { |
| return 0; |
| } |
| for (j = 0; j < cdev; j++) { |
| xendev = xen_be_get_xendev(type, dom, atoi(dev[j]), ops); |
| if (xendev == NULL) { |
| continue; |
| } |
| xen_be_check_state(xendev); |
| } |
| free(dev); |
| return 0; |
| } |
| |
| void xenstore_update_be(char *watch, char *type, int dom, |
| struct XenDevOps *ops) |
| { |
| struct XenLegacyDevice *xendev; |
| char path[XEN_BUFSIZE], *bepath; |
| unsigned int len, dev; |
| |
| len = snprintf(path, sizeof(path), "backend/%s/%d", type, dom); |
| if (strncmp(path, watch, len) != 0) { |
| return; |
| } |
| if (sscanf(watch + len, "/%u/%255s", &dev, path) != 2) { |
| strcpy(path, ""); |
| if (sscanf(watch + len, "/%u", &dev) != 1) { |
| dev = -1; |
| } |
| } |
| if (dev == -1) { |
| return; |
| } |
| |
| xendev = xen_be_get_xendev(type, dom, dev, ops); |
| if (xendev != NULL) { |
| bepath = xs_read(xenstore, 0, xendev->be, &len); |
| if (bepath == NULL) { |
| xen_pv_del_xendev(xendev); |
| } else { |
| free(bepath); |
| xen_be_backend_changed(xendev, path); |
| xen_be_check_state(xendev); |
| } |
| } |
| } |
| |
| void xenstore_update_fe(char *watch, struct XenLegacyDevice *xendev) |
| { |
| char *node; |
| unsigned int len; |
| |
| len = strlen(xendev->fe); |
| if (strncmp(xendev->fe, watch, len) != 0) { |
| return; |
| } |
| if (watch[len] != '/') { |
| return; |
| } |
| node = watch + len + 1; |
| |
| xen_be_frontend_changed(xendev, node); |
| xen_be_check_state(xendev); |
| } |
| /* -------------------------------------------------------------------- */ |
| |
| int xen_be_init(void) |
| { |
| xengnttab_handle *gnttabdev; |
| |
| xenstore = xs_daemon_open(); |
| if (!xenstore) { |
| xen_pv_printf(NULL, 0, "can't connect to xenstored\n"); |
| return -1; |
| } |
| |
| qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL); |
| |
| if (xen_xc == NULL || xen_fmem == NULL) { |
| /* Check if xen_init() have been called */ |
| goto err; |
| } |
| |
| gnttabdev = xengnttab_open(NULL, 0); |
| if (gnttabdev != NULL) { |
| if (xengnttab_grant_copy(gnttabdev, 0, NULL) == 0) { |
| xen_feature_grant_copy = true; |
| } |
| xengnttab_close(gnttabdev); |
| } |
| |
| xen_sysdev = qdev_new(TYPE_XENSYSDEV); |
| sysbus_realize_and_unref(SYS_BUS_DEVICE(xen_sysdev), &error_fatal); |
| xen_sysbus = qbus_new(TYPE_XENSYSBUS, xen_sysdev, "xen-sysbus"); |
| qbus_set_bus_hotplug_handler(xen_sysbus); |
| |
| return 0; |
| |
| err: |
| qemu_set_fd_handler(xs_fileno(xenstore), NULL, NULL, NULL); |
| xs_daemon_close(xenstore); |
| xenstore = NULL; |
| |
| return -1; |
| } |
| |
| static void xen_set_dynamic_sysbus(void) |
| { |
| Object *machine = qdev_get_machine(); |
| ObjectClass *oc = object_get_class(machine); |
| MachineClass *mc = MACHINE_CLASS(oc); |
| |
| machine_class_allow_dynamic_sysbus_dev(mc, TYPE_XENSYSDEV); |
| } |
| |
| int xen_be_register(const char *type, struct XenDevOps *ops) |
| { |
| char path[50]; |
| int rc; |
| |
| if (ops->backend_register) { |
| rc = ops->backend_register(); |
| if (rc) { |
| return rc; |
| } |
| } |
| |
| snprintf(path, sizeof(path), "device-model/%u/backends/%s", xen_domid, |
| type); |
| xenstore_mkdir(path, XS_PERM_NONE); |
| |
| return xenstore_scan(type, xen_domid, ops); |
| } |
| |
| void xen_be_register_common(void) |
| { |
| xen_set_dynamic_sysbus(); |
| |
| xen_be_register("console", &xen_console_ops); |
| xen_be_register("vkbd", &xen_kbdmouse_ops); |
| #ifdef CONFIG_VIRTFS |
| xen_be_register("9pfs", &xen_9pfs_ops); |
| #endif |
| #ifdef CONFIG_USB_LIBUSB |
| xen_be_register("qusb", &xen_usb_ops); |
| #endif |
| } |
| |
| int xen_be_bind_evtchn(struct XenLegacyDevice *xendev) |
| { |
| if (xendev->local_port != -1) { |
| return 0; |
| } |
| xendev->local_port = xenevtchn_bind_interdomain |
| (xendev->evtchndev, xendev->dom, xendev->remote_port); |
| if (xendev->local_port == -1) { |
| xen_pv_printf(xendev, 0, "xenevtchn_bind_interdomain failed\n"); |
| return -1; |
| } |
| xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port); |
| qemu_set_fd_handler(xenevtchn_fd(xendev->evtchndev), |
| xen_pv_evtchn_event, NULL, xendev); |
| return 0; |
| } |
| |
| |
| static Property xendev_properties[] = { |
| DEFINE_PROP_END_OF_LIST(), |
| }; |
| |
| static void xendev_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| |
| device_class_set_props(dc, xendev_properties); |
| set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
| /* xen-backend devices can be plugged/unplugged dynamically */ |
| dc->user_creatable = true; |
| dc->bus_type = TYPE_XENSYSBUS; |
| } |
| |
| static const TypeInfo xendev_type_info = { |
| .name = TYPE_XENBACKEND, |
| .parent = TYPE_DEVICE, |
| .class_init = xendev_class_init, |
| .instance_size = sizeof(struct XenLegacyDevice), |
| }; |
| |
| static void xen_sysbus_class_init(ObjectClass *klass, void *data) |
| { |
| HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass); |
| |
| hc->unplug = qdev_simple_device_unplug_cb; |
| } |
| |
| static const TypeInfo xensysbus_info = { |
| .name = TYPE_XENSYSBUS, |
| .parent = TYPE_BUS, |
| .class_init = xen_sysbus_class_init, |
| .interfaces = (InterfaceInfo[]) { |
| { TYPE_HOTPLUG_HANDLER }, |
| { } |
| } |
| }; |
| |
| static Property xen_sysdev_properties[] = { |
| {/* end of property list */}, |
| }; |
| |
| static void xen_sysdev_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| |
| device_class_set_props(dc, xen_sysdev_properties); |
| } |
| |
| static const TypeInfo xensysdev_info = { |
| .name = TYPE_XENSYSDEV, |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(SysBusDevice), |
| .class_init = xen_sysdev_class_init, |
| }; |
| |
| static void xenbe_register_types(void) |
| { |
| type_register_static(&xensysbus_info); |
| type_register_static(&xensysdev_info); |
| type_register_static(&xendev_type_info); |
| } |
| |
| type_init(xenbe_register_types) |
