hw/xen_devconfig.c

   1 #include "xen_backend.h"
   2 #include "blockdev.h"
   3
   4 /* ------------------------------------------------------------- */
   5
   6 struct xs_dirs {
   7     char *xs_dir;
   8     QTAILQ_ENTRY(xs_dirs) list;
   9 };
  10 static QTAILQ_HEAD(xs_dirs_head, xs_dirs) xs_cleanup = QTAILQ_HEAD_INITIALIZER(xs_cleanup);
  11
  12 static void xen_config_cleanup_dir(char *dir)
  13 {
  14     struct xs_dirs *d;
  15
  16     d = g_malloc(sizeof(*d));
  17     d->xs_dir = dir;
  18     QTAILQ_INSERT_TAIL(&xs_cleanup, d, list);
  19 }
  20
  21 void xen_config_cleanup(void)
  22 {
  23     struct xs_dirs *d;
  24
  25     QTAILQ_FOREACH(d, &xs_cleanup, list) {
  26         xs_rm(xenstore, 0, d->xs_dir);
  27     }
  28 }
  29
  30 /* ------------------------------------------------------------- */
  31
  32 static int xen_config_dev_mkdir(char *dev, int p)
  33 {
  34     struct xs_permissions perms[2] = {{
  35             .id    = 0, /* set owner: dom0 */
  36         },{
  37             .id    = xen_domid,
  38             .perms = p,
  39         }};
  40
  41     if (!xs_mkdir(xenstore, 0, dev)) {
  42         xen_be_printf(NULL, 0, "xs_mkdir %s: failed\n", dev);
  43         return -1;
  44     }
  45     xen_config_cleanup_dir(g_strdup(dev));
  46
  47     if (!xs_set_permissions(xenstore, 0, dev, perms, 2)) {
  48         xen_be_printf(NULL, 0, "xs_set_permissions %s: failed\n", dev);
  49         return -1;
  50     }
  51     return 0;
  52 }
  53
  54 static int xen_config_dev_dirs(const char *ftype, const char *btype, int vdev,
  55                                char *fe, char *be, int len)
  56 {
  57     char *dom;
  58
  59     dom = xs_get_domain_path(xenstore, xen_domid);
  60     snprintf(fe, len, "%s/device/%s/%d", dom, ftype, vdev);
  61     free(dom);
  62
  63     dom = xs_get_domain_path(xenstore, 0);
  64     snprintf(be, len, "%s/backend/%s/%d/%d", dom, btype, xen_domid, vdev);
  65     free(dom);
  66
  67     xen_config_dev_mkdir(fe, XS_PERM_READ | XS_PERM_WRITE);
  68     xen_config_dev_mkdir(be, XS_PERM_READ);
  69     return 0;
  70 }
  71
  72 static int xen_config_dev_all(char *fe, char *be)
  73 {
  74     /* frontend */
  75     if (xen_protocol)
  76         xenstore_write_str(fe, "protocol", xen_protocol);
  77
  78     xenstore_write_int(fe, "state",           XenbusStateInitialising);
  79     xenstore_write_int(fe, "backend-id",      0);
  80     xenstore_write_str(fe, "backend",         be);
  81
  82     /* backend */
  83     xenstore_write_str(be, "domain",          qemu_name ? qemu_name : "no-name");
  84     xenstore_write_int(be, "online",          1);
  85     xenstore_write_int(be, "state",           XenbusStateInitialising);
  86     xenstore_write_int(be, "frontend-id",     xen_domid);
  87     xenstore_write_str(be, "frontend",        fe);
  88
  89     return 0;
  90 }
  91
  92 /* ------------------------------------------------------------- */
  93
  94 int xen_config_dev_blk(DriveInfo *disk)
  95 {
  96     char fe[256], be[256], device_name[32];
  97     int vdev = 202 * 256 + 16 * disk->unit;
  98     int cdrom = disk->media_cd;
  99     const char *devtype = cdrom ? "cdrom" : "disk";
 100     const char *mode    = cdrom ? "r"     : "w";
 101     const char *filename = qemu_opt_get(disk->opts, "file");
 102
 103     snprintf(device_name, sizeof(device_name), "xvd%c", 'a' + disk->unit);
 104     xen_be_printf(NULL, 1, "config disk %d [%s]: %s\n",
 105                   disk->unit, device_name, filename);
 106     xen_config_dev_dirs("vbd", "qdisk", vdev, fe, be, sizeof(fe));
 107
 108     /* frontend */
 109     xenstore_write_int(fe, "virtual-device",  vdev);
 110     xenstore_write_str(fe, "device-type",     devtype);
 111
 112     /* backend */
 113     xenstore_write_str(be, "dev",             device_name);
 114     xenstore_write_str(be, "type",            "file");
 115     xenstore_write_str(be, "params",          filename);
 116     xenstore_write_str(be, "mode",            mode);
 117
 118     /* common stuff */
 119     return xen_config_dev_all(fe, be);
 120 }
 121
 122 int xen_config_dev_nic(NICInfo *nic)
 123 {
 124     char fe[256], be[256];
 125     char mac[20];
 126
 127     snprintf(mac, sizeof(mac), "%02x:%02x:%02x:%02x:%02x:%02x",
 128              nic->macaddr.a[0], nic->macaddr.a[1], nic->macaddr.a[2],
 129              nic->macaddr.a[3], nic->macaddr.a[4], nic->macaddr.a[5]);
 130     xen_be_printf(NULL, 1, "config nic %d: mac=\"%s\"\n", nic->vlan->id, mac);
 131     xen_config_dev_dirs("vif", "qnic", nic->vlan->id, fe, be, sizeof(fe));
 132
 133     /* frontend */
 134     xenstore_write_int(fe, "handle",     nic->vlan->id);
 135     xenstore_write_str(fe, "mac",        mac);
 136
 137     /* backend */
 138     xenstore_write_int(be, "handle",     nic->vlan->id);
 139     xenstore_write_str(be, "mac",        mac);
 140
 141     /* common stuff */
 142     return xen_config_dev_all(fe, be);
 143 }
 144
 145 int xen_config_dev_vfb(int vdev, const char *type)
 146 {
 147     char fe[256], be[256];
 148
 149     xen_config_dev_dirs("vfb", "vfb", vdev, fe, be, sizeof(fe));
 150
 151     /* backend */
 152     xenstore_write_str(be, "type",  type);
 153
 154     /* common stuff */
 155     return xen_config_dev_all(fe, be);
 156 }
 157
 158 int xen_config_dev_vkbd(int vdev)
 159 {
 160     char fe[256], be[256];
 161
 162     xen_config_dev_dirs("vkbd", "vkbd", vdev, fe, be, sizeof(fe));
 163     return xen_config_dev_all(fe, be);
 164 }
 165
 166 int xen_config_dev_console(int vdev)
 167 {
 168     char fe[256], be[256];
 169
 170     xen_config_dev_dirs("console", "console", vdev, fe, be, sizeof(fe));
 171     return xen_config_dev_all(fe, be);
 172 }