hw/xen/xen_devconfig.c

   1 #include "qemu/osdep.h"
   2 #include "hw/xen/xen_backend.h"
   3 #include "sysemu/block-backend.h"
   4 #include "sysemu/blockdev.h"
   5
   6 /* ------------------------------------------------------------- */
   7
   8 struct xs_dirs {
   9     char *xs_dir;
  10     QTAILQ_ENTRY(xs_dirs) list;
  11 };
  12 static QTAILQ_HEAD(xs_dirs_head, xs_dirs) xs_cleanup = QTAILQ_HEAD_INITIALIZER(xs_cleanup);
  13
  14 static void xen_config_cleanup_dir(char *dir)
  15 {
  16     struct xs_dirs *d;
  17
  18     d = g_malloc(sizeof(*d));
  19     d->xs_dir = dir;
  20     QTAILQ_INSERT_TAIL(&xs_cleanup, d, list);
  21 }
  22
  23 void xen_config_cleanup(void)
  24 {
  25     struct xs_dirs *d;
  26
  27     QTAILQ_FOREACH(d, &xs_cleanup, list) {
  28         xs_rm(xenstore, 0, d->xs_dir);
  29     }
  30 }
  31
  32 /* ------------------------------------------------------------- */
  33
  34 static int xen_config_dev_mkdir(char *dev, int p)
  35 {
  36     struct xs_permissions perms[2] = {{
  37             .id    = 0, /* set owner: dom0 */
  38         },{
  39             .id    = xen_domid,
  40             .perms = p,
  41         }};
  42
  43     if (!xs_mkdir(xenstore, 0, dev)) {
  44         xen_be_printf(NULL, 0, "xs_mkdir %s: failed\n", dev);
  45         return -1;
  46     }
  47     xen_config_cleanup_dir(g_strdup(dev));
  48
  49     if (!xs_set_permissions(xenstore, 0, dev, perms, 2)) {
  50         xen_be_printf(NULL, 0, "xs_set_permissions %s: failed\n", dev);
  51         return -1;
  52     }
  53     return 0;
  54 }
  55
  56 static int xen_config_dev_dirs(const char *ftype, const char *btype, int vdev,
  57                                char *fe, char *be, int len)
  58 {
  59     char *dom;
  60
  61     dom = xs_get_domain_path(xenstore, xen_domid);
  62     snprintf(fe, len, "%s/device/%s/%d", dom, ftype, vdev);
  63     free(dom);
  64
  65     dom = xs_get_domain_path(xenstore, 0);
  66     snprintf(be, len, "%s/backend/%s/%d/%d", dom, btype, xen_domid, vdev);
  67     free(dom);
  68
  69     xen_config_dev_mkdir(fe, XS_PERM_READ | XS_PERM_WRITE);
  70     xen_config_dev_mkdir(be, XS_PERM_READ);
  71     return 0;
  72 }
  73
  74 static int xen_config_dev_all(char *fe, char *be)
  75 {
  76     /* frontend */
  77     if (xen_protocol)
  78         xenstore_write_str(fe, "protocol", xen_protocol);
  79
  80     xenstore_write_int(fe, "state",           XenbusStateInitialising);
  81     xenstore_write_int(fe, "backend-id",      0);
  82     xenstore_write_str(fe, "backend",         be);
  83
  84     /* backend */
  85     xenstore_write_str(be, "domain",          qemu_name ? qemu_name : "no-name");
  86     xenstore_write_int(be, "online",          1);
  87     xenstore_write_int(be, "state",           XenbusStateInitialising);
  88     xenstore_write_int(be, "frontend-id",     xen_domid);
  89     xenstore_write_str(be, "frontend",        fe);
  90
  91     return 0;
  92 }
  93
  94 /* ------------------------------------------------------------- */
  95
  96 int xen_config_dev_blk(DriveInfo *disk)
  97 {
  98     char fe[256], be[256], device_name[32];
  99     int vdev = 202 * 256 + 16 * disk->unit;
 100     int cdrom = disk->media_cd;
 101     const char *devtype = cdrom ? "cdrom" : "disk";
 102     const char *mode    = cdrom ? "r"     : "w";
 103     const char *filename = qemu_opt_get(disk->opts, "file");
 104
 105     snprintf(device_name, sizeof(device_name), "xvd%c", 'a' + disk->unit);
 106     xen_be_printf(NULL, 1, "config disk %d [%s]: %s\n",
 107                   disk->unit, device_name, filename);
 108     xen_config_dev_dirs("vbd", "qdisk", vdev, fe, be, sizeof(fe));
 109
 110     /* frontend */
 111     xenstore_write_int(fe, "virtual-device",  vdev);
 112     xenstore_write_str(fe, "device-type",     devtype);
 113
 114     /* backend */
 115     xenstore_write_str(be, "dev",             device_name);
 116     xenstore_write_str(be, "type",            "file");
 117     xenstore_write_str(be, "params",          filename);
 118     xenstore_write_str(be, "mode",            mode);
 119
 120     /* common stuff */
 121     return xen_config_dev_all(fe, be);
 122 }
 123
 124 int xen_config_dev_nic(NICInfo *nic)
 125 {
 126     char fe[256], be[256];
 127     char mac[20];
 128     int vlan_id = -1;
 129
 130     net_hub_id_for_client(nic->netdev, &vlan_id);
 131     snprintf(mac, sizeof(mac), "%02x:%02x:%02x:%02x:%02x:%02x",
 132              nic->macaddr.a[0], nic->macaddr.a[1], nic->macaddr.a[2],
 133              nic->macaddr.a[3], nic->macaddr.a[4], nic->macaddr.a[5]);
 134     xen_be_printf(NULL, 1, "config nic %d: mac=\"%s\"\n", vlan_id, mac);
 135     xen_config_dev_dirs("vif", "qnic", vlan_id, fe, be, sizeof(fe));
 136
 137     /* frontend */
 138     xenstore_write_int(fe, "handle",     vlan_id);
 139     xenstore_write_str(fe, "mac",        mac);
 140
 141     /* backend */
 142     xenstore_write_int(be, "handle",     vlan_id);
 143     xenstore_write_str(be, "mac",        mac);
 144
 145     /* common stuff */
 146     return xen_config_dev_all(fe, be);
 147 }
 148
 149 int xen_config_dev_vfb(int vdev, const char *type)
 150 {
 151     char fe[256], be[256];
 152
 153     xen_config_dev_dirs("vfb", "vfb", vdev, fe, be, sizeof(fe));
 154
 155     /* backend */
 156     xenstore_write_str(be, "type",  type);
 157
 158     /* common stuff */
 159     return xen_config_dev_all(fe, be);
 160 }
 161
 162 int xen_config_dev_vkbd(int vdev)
 163 {
 164     char fe[256], be[256];
 165
 166     xen_config_dev_dirs("vkbd", "vkbd", vdev, fe, be, sizeof(fe));
 167     return xen_config_dev_all(fe, be);
 168 }
 169
 170 int xen_config_dev_console(int vdev)
 171 {
 172     char fe[256], be[256];
 173
 174     xen_config_dev_dirs("console", "console", vdev, fe, be, sizeof(fe));
 175     return xen_config_dev_all(fe, be);
 176 }