Archipelago » qemu

#include "xen_backend.h"

#include "blockdev.h"

/* ------------------------------------------------------------- */

struct xs_dirs {

    char *xs_dir;

    QTAILQ_ENTRY(xs_dirs) list;

};

static QTAILQ_HEAD(xs_dirs_head, xs_dirs) xs_cleanup = QTAILQ_HEAD_INITIALIZER(xs_cleanup);

static void xen_config_cleanup_dir(char *dir)

{

    struct xs_dirs *d;

    d = g_malloc(sizeof(*d));

    d->xs_dir = dir;

    QTAILQ_INSERT_TAIL(&xs_cleanup, d, list);

}

void xen_config_cleanup(void)

{

    struct xs_dirs *d;

    QTAILQ_FOREACH(d, &xs_cleanup, list) {

        xs_rm(xenstore, 0, d->xs_dir);

    }

}

/* ------------------------------------------------------------- */

static int xen_config_dev_mkdir(char *dev, int p)

{

    struct xs_permissions perms[2] = {{

            .id    = 0, /* set owner: dom0 */

        },{

            .id    = xen_domid,

            .perms = p,

        }};

    if (!xs_mkdir(xenstore, 0, dev)) {

        xen_be_printf(NULL, 0, "xs_mkdir %s: failed\n", dev);

        return -1;

    }

    xen_config_cleanup_dir(g_strdup(dev));

    if (!xs_set_permissions(xenstore, 0, dev, perms, 2)) {

        xen_be_printf(NULL, 0, "xs_set_permissions %s: failed\n", dev);

        return -1;

    }

    return 0;

}

static int xen_config_dev_dirs(const char *ftype, const char *btype, int vdev,

                               char *fe, char *be, int len)

{

    char *dom;

    dom = xs_get_domain_path(xenstore, xen_domid);

    snprintf(fe, len, "%s/device/%s/%d", dom, ftype, vdev);

    free(dom);

    dom = xs_get_domain_path(xenstore, 0);

    snprintf(be, len, "%s/backend/%s/%d/%d", dom, btype, xen_domid, vdev);

    free(dom);

    xen_config_dev_mkdir(fe, XS_PERM_READ | XS_PERM_WRITE);

    xen_config_dev_mkdir(be, XS_PERM_READ);

    return 0;

}

static int xen_config_dev_all(char *fe, char *be)

{

    /* frontend */

    if (xen_protocol)

        xenstore_write_str(fe, "protocol", xen_protocol);

    xenstore_write_int(fe, "state",           XenbusStateInitialising);

    xenstore_write_int(fe, "backend-id",      0);

    xenstore_write_str(fe, "backend",         be);

    /* backend */

    xenstore_write_str(be, "domain",          qemu_name ? qemu_name : "no-name");

    xenstore_write_int(be, "online",          1);

    xenstore_write_int(be, "state",           XenbusStateInitialising);

    xenstore_write_int(be, "frontend-id",     xen_domid);

    xenstore_write_str(be, "frontend",        fe);

    return 0;

}

/* ------------------------------------------------------------- */

int xen_config_dev_blk(DriveInfo *disk)

{

    char fe[256], be[256], device_name[32];

    int vdev = 202 * 256 + 16 * disk->unit;

    int cdrom = disk->media_cd;

    const char *devtype = cdrom ? "cdrom" : "disk";

    const char *mode    = cdrom ? "r"     : "w";

    const char *filename = qemu_opt_get(disk->opts, "file");

    snprintf(device_name, sizeof(device_name), "xvd%c", 'a' + disk->unit);

    xen_be_printf(NULL, 1, "config disk %d [%s]: %s\n",

                  disk->unit, device_name, filename);

    xen_config_dev_dirs("vbd", "qdisk", vdev, fe, be, sizeof(fe));

    /* frontend */

    xenstore_write_int(fe, "virtual-device",  vdev);

    xenstore_write_str(fe, "device-type",     devtype);

    /* backend */

    xenstore_write_str(be, "dev",             device_name);

    xenstore_write_str(be, "type",            "file");

    xenstore_write_str(be, "params",          filename);

    xenstore_write_str(be, "mode",            mode);

    /* common stuff */

    return xen_config_dev_all(fe, be);

}

int xen_config_dev_nic(NICInfo *nic)

{

    char fe[256], be[256];

    char mac[20];

    snprintf(mac, sizeof(mac), "%02x:%02x:%02x:%02x:%02x:%02x",

             nic->macaddr.a[0], nic->macaddr.a[1], nic->macaddr.a[2],

             nic->macaddr.a[3], nic->macaddr.a[4], nic->macaddr.a[5]);

    xen_be_printf(NULL, 1, "config nic %d: mac=\"%s\"\n", nic->vlan->id, mac);

    xen_config_dev_dirs("vif", "qnic", nic->vlan->id, fe, be, sizeof(fe));

    /* frontend */

    xenstore_write_int(fe, "handle",     nic->vlan->id);

    xenstore_write_str(fe, "mac",        mac);

    /* backend */

    xenstore_write_int(be, "handle",     nic->vlan->id);

    xenstore_write_str(be, "mac",        mac);

    /* common stuff */

    return xen_config_dev_all(fe, be);

}

int xen_config_dev_vfb(int vdev, const char *type)

{

    char fe[256], be[256];

    xen_config_dev_dirs("vfb", "vfb", vdev, fe, be, sizeof(fe));

    /* backend */

    xenstore_write_str(be, "type",  type);

    /* common stuff */

    return xen_config_dev_all(fe, be);

}

int xen_config_dev_vkbd(int vdev)

{

    char fe[256], be[256];

    xen_config_dev_dirs("vkbd", "vkbd", vdev, fe, be, sizeof(fe));

    return xen_config_dev_all(fe, be);

}

int xen_config_dev_console(int vdev)

{

    char fe[256], be[256];

    xen_config_dev_dirs("console", "console", vdev, fe, be, sizeof(fe));

    return xen_config_dev_all(fe, be);

}