hw/xen_devconfig.c

   1 #include "xen_backend.h"
   2
   3 /* ------------------------------------------------------------- */
   4
   5 struct xs_dirs {
   6     char *xs_dir;
   7     QTAILQ_ENTRY(xs_dirs) list;
   8 };
   9 static QTAILQ_HEAD(xs_dirs_head, xs_dirs) xs_cleanup = QTAILQ_HEAD_INITIALIZER(xs_cleanup);
  10
  11 static void xen_config_cleanup_dir(char *dir)
  12 {
  13     struct xs_dirs *d;
  14
  15     d = qemu_malloc(sizeof(*d));
  16     d->xs_dir = dir;
  17     QTAILQ_INSERT_TAIL(&xs_cleanup, d, list);
  18 }
  19
  20 void xen_config_cleanup(void)
  21 {
  22     struct xs_dirs *d;
  23
  24     QTAILQ_FOREACH(d, &xs_cleanup, list) {
  25         xs_rm(xenstore, 0, d->xs_dir);
  26     }
  27 }
  28
  29 /* ------------------------------------------------------------- */
  30
  31 static int xen_config_dev_mkdir(char *dev, int p)
  32 {
  33     struct xs_permissions perms[2] = {{
  34             .id    = 0, /* set owner: dom0 */
  35         },{
  36             .id    = xen_domid,
  37             .perms = p,
  38         }};
  39
  40     if (!xs_mkdir(xenstore, 0, dev)) {
  41         xen_be_printf(NULL, 0, "xs_mkdir %s: failed\n", dev);
  42         return -1;
  43     }
  44     xen_config_cleanup_dir(qemu_strdup(dev));
  45
  46     if (!xs_set_permissions(xenstore, 0, dev, perms, 2)) {
  47         xen_be_printf(NULL, 0, "xs_set_permissions %s: failed\n", dev);
  48         return -1;
  49     }
  50     return 0;
  51 }
  52
  53 static int xen_config_dev_dirs(const char *ftype, const char *btype, int vdev,
  54                                char *fe, char *be, int len)
  55 {
  56     char *dom;
  57
  58     dom = xs_get_domain_path(xenstore, xen_domid);
  59     snprintf(fe, len, "%s/device/%s/%d", dom, ftype, vdev);
  60     free(dom);
  61
  62     dom = xs_get_domain_path(xenstore, 0);
  63     snprintf(be, len, "%s/backend/%s/%d/%d", dom, btype, xen_domid, vdev);
  64     free(dom);
  65
  66     xen_config_dev_mkdir(fe, XS_PERM_READ | XS_PERM_WRITE);
  67     xen_config_dev_mkdir(be, XS_PERM_READ);
  68     return 0;
  69 }
  70
  71 static int xen_config_dev_all(char *fe, char *be)
  72 {
  73     /* frontend */
  74     if (xen_protocol)
  75         xenstore_write_str(fe, "protocol", xen_protocol);
  76
  77     xenstore_write_int(fe, "state",           XenbusStateInitialising);
  78     xenstore_write_int(fe, "backend-id",      0);
  79     xenstore_write_str(fe, "backend",         be);
  80
  81     /* backend */
  82     xenstore_write_str(be, "domain",          qemu_name ? qemu_name : "no-name");
  83     xenstore_write_int(be, "online",          1);
  84     xenstore_write_int(be, "state",           XenbusStateInitialising);
  85     xenstore_write_int(be, "frontend-id",     xen_domid);
  86     xenstore_write_str(be, "frontend",        fe);
  87
  88     return 0;
  89 }
  90
  91 /* ------------------------------------------------------------- */
  92
  93 int xen_config_dev_blk(DriveInfo *disk)
  94 {
  95     char fe[256], be[256];
  96     int vdev = 202 * 256 + 16 * disk->unit;
  97     int cdrom = disk->bdrv->type == BDRV_TYPE_CDROM;
  98     const char *devtype = cdrom ? "cdrom" : "disk";
  99     const char *mode    = cdrom ? "r"     : "w";
 100
 101     snprintf(disk->bdrv->device_name, sizeof(disk->bdrv->device_name),
 102              "xvd%c", 'a' + disk->unit);
 103     xen_be_printf(NULL, 1, "config disk %d [%s]: %s\n",
 104                   disk->unit, disk->bdrv->device_name, disk->bdrv->filename);
 105     xen_config_dev_dirs("vbd", "qdisk", vdev, fe, be, sizeof(fe));
 106
 107     /* frontend */
 108     xenstore_write_int(fe, "virtual-device",  vdev);
 109     xenstore_write_str(fe, "device-type",     devtype);
 110
 111     /* backend */
 112     xenstore_write_str(be, "dev",             disk->bdrv->device_name);
 113     xenstore_write_str(be, "type",            "file");
 114     xenstore_write_str(be, "params",          disk->bdrv->filename);
 115     xenstore_write_str(be, "mode",            mode);
 116
 117     /* common stuff */
 118     return xen_config_dev_all(fe, be);
 119 }
 120
 121 int xen_config_dev_nic(NICInfo *nic)
 122 {
 123     char fe[256], be[256];
 124     char mac[20];
 125
 126     snprintf(mac, sizeof(mac), "%02x:%02x:%02x:%02x:%02x:%02x",
 127              nic->macaddr[0], nic->macaddr[1], nic->macaddr[2],
 128              nic->macaddr[3], nic->macaddr[4], nic->macaddr[5]);
 129     xen_be_printf(NULL, 1, "config nic %d: mac=\"%s\"\n", nic->vlan->id, mac);
 130     xen_config_dev_dirs("vif", "qnic", nic->vlan->id, fe, be, sizeof(fe));
 131
 132     /* frontend */
 133     xenstore_write_int(fe, "handle",     nic->vlan->id);
 134     xenstore_write_str(fe, "mac",        mac);
 135
 136     /* backend */
 137     xenstore_write_int(be, "handle",     nic->vlan->id);
 138     xenstore_write_str(be, "mac",        mac);
 139
 140     /* common stuff */
 141     return xen_config_dev_all(fe, be);
 142 }
 143
 144 int xen_config_dev_vfb(int vdev, const char *type)
 145 {
 146     char fe[256], be[256];
 147
 148     xen_config_dev_dirs("vfb", "vfb", vdev, fe, be, sizeof(fe));
 149
 150     /* backend */
 151     xenstore_write_str(be, "type",  type);
 152
 153     /* common stuff */
 154     return xen_config_dev_all(fe, be);
 155 }
 156
 157 int xen_config_dev_vkbd(int vdev)
 158 {
 159     char fe[256], be[256];
 160
 161     xen_config_dev_dirs("vkbd", "vkbd", vdev, fe, be, sizeof(fe));
 162     return xen_config_dev_all(fe, be);
 163 }
 164
 165 int xen_config_dev_console(int vdev)
 166 {
 167     char fe[256], be[256];
 168
 169     xen_config_dev_dirs("console", "console", vdev, fe, be, sizeof(fe));
 170     return xen_config_dev_all(fe, be);
 171 }