hw/xen/xen_devconfig.c

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