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root / hw / xen_devconfig.c @ 72cf2d4f

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#include "xen_backend.h"
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/* ------------------------------------------------------------- */
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struct xs_dirs {
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    char *xs_dir;
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    QTAILQ_ENTRY(xs_dirs) list;
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};
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static QTAILQ_HEAD(xs_dirs_head, xs_dirs) xs_cleanup = QTAILQ_HEAD_INITIALIZER(xs_cleanup);
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static void xen_config_cleanup_dir(char *dir)
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{
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    struct xs_dirs *d;
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    d = qemu_malloc(sizeof(*d));
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    d->xs_dir = dir;
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    QTAILQ_INSERT_TAIL(&xs_cleanup, d, list);
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}
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void xen_config_cleanup(void)
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{
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    struct xs_dirs *d;
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    QTAILQ_FOREACH(d, &xs_cleanup, list) {
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        xs_rm(xenstore, 0, d->xs_dir);
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    }
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}
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/* ------------------------------------------------------------- */
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static int xen_config_dev_mkdir(char *dev, int p)
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{
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    struct xs_permissions perms[2] = {{
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            .id    = 0, /* set owner: dom0 */
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        },{
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            .id    = xen_domid,
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            .perms = p,
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        }};
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    if (!xs_mkdir(xenstore, 0, dev)) {
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        xen_be_printf(NULL, 0, "xs_mkdir %s: failed\n", dev);
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        return -1;
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    }
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    xen_config_cleanup_dir(qemu_strdup(dev));
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    if (!xs_set_permissions(xenstore, 0, dev, perms, 2)) {
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        xen_be_printf(NULL, 0, "xs_set_permissions %s: failed\n", dev);
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        return -1;
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    }
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    return 0;
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}
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static int xen_config_dev_dirs(const char *ftype, const char *btype, int vdev,
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                               char *fe, char *be, int len)
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{
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    char *dom;
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    dom = xs_get_domain_path(xenstore, xen_domid);
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    snprintf(fe, len, "%s/device/%s/%d", dom, ftype, vdev);
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    free(dom);
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    dom = xs_get_domain_path(xenstore, 0);
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    snprintf(be, len, "%s/backend/%s/%d/%d", dom, btype, xen_domid, vdev);
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    free(dom);
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    xen_config_dev_mkdir(fe, XS_PERM_READ | XS_PERM_WRITE);
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    xen_config_dev_mkdir(be, XS_PERM_READ);
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    return 0;
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}
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static int xen_config_dev_all(char *fe, char *be)
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{
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    /* frontend */
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    if (xen_protocol)
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        xenstore_write_str(fe, "protocol", xen_protocol);
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    xenstore_write_int(fe, "state",           XenbusStateInitialising);
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    xenstore_write_int(fe, "backend-id",      0);
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    xenstore_write_str(fe, "backend",         be);
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    /* backend */
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    xenstore_write_str(be, "domain",          qemu_name ? qemu_name : "no-name");
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    xenstore_write_int(be, "online",          1);
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    xenstore_write_int(be, "state",           XenbusStateInitialising);
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    xenstore_write_int(be, "frontend-id",     xen_domid);
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    xenstore_write_str(be, "frontend",        fe);
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    return 0;
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}
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/* ------------------------------------------------------------- */
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int xen_config_dev_blk(DriveInfo *disk)
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{
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    char fe[256], be[256];
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    int vdev = 202 * 256 + 16 * disk->unit;
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    int cdrom = disk->bdrv->type == BDRV_TYPE_CDROM;
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    const char *devtype = cdrom ? "cdrom" : "disk";
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    const char *mode    = cdrom ? "r"     : "w";
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    snprintf(disk->bdrv->device_name, sizeof(disk->bdrv->device_name),
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             "xvd%c", 'a' + disk->unit);
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    xen_be_printf(NULL, 1, "config disk %d [%s]: %s\n",
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                  disk->unit, disk->bdrv->device_name, disk->bdrv->filename);
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    xen_config_dev_dirs("vbd", "qdisk", vdev, fe, be, sizeof(fe));
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    /* frontend */
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    xenstore_write_int(fe, "virtual-device",  vdev);
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    xenstore_write_str(fe, "device-type",     devtype);
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    /* backend */
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    xenstore_write_str(be, "dev",             disk->bdrv->device_name);
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    xenstore_write_str(be, "type",            "file");
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    xenstore_write_str(be, "params",          disk->bdrv->filename);
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    xenstore_write_str(be, "mode",            mode);
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    /* common stuff */
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    return xen_config_dev_all(fe, be);
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}
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int xen_config_dev_nic(NICInfo *nic)
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{
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    char fe[256], be[256];
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    char mac[20];
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    snprintf(mac, sizeof(mac), "%02x:%02x:%02x:%02x:%02x:%02x",
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             nic->macaddr[0], nic->macaddr[1], nic->macaddr[2],
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             nic->macaddr[3], nic->macaddr[4], nic->macaddr[5]);
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    xen_be_printf(NULL, 1, "config nic %d: mac=\"%s\"\n", nic->vlan->id, mac);
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    xen_config_dev_dirs("vif", "qnic", nic->vlan->id, fe, be, sizeof(fe));
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    /* frontend */
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    xenstore_write_int(fe, "handle",     nic->vlan->id);
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    xenstore_write_str(fe, "mac",        mac);
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    /* backend */
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    xenstore_write_int(be, "handle",     nic->vlan->id);
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    xenstore_write_str(be, "mac",        mac);
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    /* common stuff */
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    return xen_config_dev_all(fe, be);
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}
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int xen_config_dev_vfb(int vdev, const char *type)
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{
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    char fe[256], be[256];
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    xen_config_dev_dirs("vfb", "vfb", vdev, fe, be, sizeof(fe));
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    /* backend */
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    xenstore_write_str(be, "type",  type);
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    /* common stuff */
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    return xen_config_dev_all(fe, be);
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}
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int xen_config_dev_vkbd(int vdev)
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{
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    char fe[256], be[256];
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    xen_config_dev_dirs("vkbd", "vkbd", vdev, fe, be, sizeof(fe));
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    return xen_config_dev_all(fe, be);
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}
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int xen_config_dev_console(int vdev)
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{
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    char fe[256], be[256];
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    xen_config_dev_dirs("console", "console", vdev, fe, be, sizeof(fe));
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    return xen_config_dev_all(fe, be);
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}