static void switch_logdirty_xswatch(libxl__egc *egc, libxl__ev_xswatch *watch,
const char *watch_path, const char *event_path)
{
libxl__logdirty_switch *lds = CONTAINER_OF(watch, *lds, watch);
STATE_AO_GC(lds->ao);
const char *got;
xs_transaction_t t = 0;
int rc;
for (;;) {
rc = libxl__xs_transaction_start(gc, &t);
if (rc) goto out;
rc = libxl__xs_read_checked(gc, t, lds->ret_path, &got);
if (rc) goto out;
if (!got) {
rc = +1;
goto out;
}
if (strcmp(got, lds->cmd)) {
LOG(ERROR,"logdirty switch: sent command `%s' but got reply `%s'"
" (xenstore paths `%s' / `%s')", lds->cmd, got,
lds->cmd_path, lds->ret_path);
rc = ERROR_FAIL;
goto out;
}
rc = libxl__xs_rm_checked(gc, t, lds->cmd_path);
if (rc) goto out;
rc = libxl__xs_rm_checked(gc, t, lds->ret_path);
if (rc) goto out;
rc = libxl__xs_transaction_commit(gc, &t);
if (!rc) break;
if (rc<0) goto out;
}
out:
/* rc < 0: error
* rc == 0: ok, we are done
* rc == +1: need to keep waiting
*/
libxl__xs_transaction_abort(gc, &t);
if (rc <= 0) {
if (rc < 0)
LOG(ERROR,"logdirty switch: failed (rc=%d)",rc);
switch_logdirty_done(egc,lds,rc);
}
}
void xswait_xswatch_callback(libxl__egc *egc, libxl__ev_xswatch *xsw,
const char *watch_path, const char *event_path)
{
EGC_GC;
libxl__xswait_state *xswa = CONTAINER_OF(xsw, *xswa, watch_ev);
int rc;
const char *data;
if (xswa->path[0] == '@') {
data = 0;
} else {
rc = libxl__xs_read_checked(gc, XBT_NULL, xswa->path, &data);
if (rc) { xswait_report_error(egc, xswa, rc); return; }
}
xswa->callback(egc, xswa, 0, data);
}
/*
* If the device has a vifname, then use that instead of
* the vifX.Y format.
* it must ONLY be used for remus because if driver domains
* were in use it would constitute a security vulnerability.
*/
static const char *get_vifname(libxl__checkpoint_device *dev,
const libxl_device_nic *nic)
{
const char *vifname = NULL;
const char *path;
int rc;
STATE_AO_GC(dev->cds->ao);
/* Convenience aliases */
const uint32_t domid = dev->cds->domid;
path = GCSPRINTF("%s/backend/vif/%d/%d/vifname",
libxl__xs_get_dompath(gc, 0), domid, nic->devid);
rc = libxl__xs_read_checked(gc, XBT_NULL, path, &vifname);
if (!rc && !vifname) {
vifname = libxl__device_nic_devname(gc, domid,
nic->devid,
nic->nictype);
}
return vifname;
}
static void domain_suspend_switch_qemu_xen_traditional_logdirty
(libxl__egc *egc, int domid, unsigned enable,
libxl__logdirty_switch *lds)
{
STATE_AO_GC(lds->ao);
int rc;
xs_transaction_t t = 0;
const char *got;
if (!lds->cmd_path) {
uint32_t dm_domid = libxl_get_stubdom_id(CTX, domid);
lds->cmd_path = DEVICE_MODEL_XS_PATH(gc, dm_domid, domid,
"/logdirty/cmd");
lds->ret_path = DEVICE_MODEL_XS_PATH(gc, dm_domid, domid,
"/logdirty/ret");
}
lds->cmd = enable ? "enable" : "disable";
rc = libxl__ev_xswatch_register(gc, &lds->watch,
switch_logdirty_xswatch, lds->ret_path);
if (rc) goto out;
rc = libxl__ev_time_register_rel(ao, &lds->timeout,
switch_logdirty_timeout, 10*1000);
if (rc) goto out;
for (;;) {
rc = libxl__xs_transaction_start(gc, &t);
if (rc) goto out;
rc = libxl__xs_read_checked(gc, t, lds->cmd_path, &got);
if (rc) goto out;
if (got) {
const char *got_ret;
rc = libxl__xs_read_checked(gc, t, lds->ret_path, &got_ret);
if (rc) goto out;
if (!got_ret || strcmp(got, got_ret)) {
LOG(ERROR,"controlling logdirty: qemu was already sent"
" command `%s' (xenstore path `%s') but result is `%s'",
got, lds->cmd_path, got_ret ? got_ret : "<none>");
rc = ERROR_FAIL;
goto out;
}
rc = libxl__xs_rm_checked(gc, t, lds->cmd_path);
if (rc) goto out;
}
rc = libxl__xs_rm_checked(gc, t, lds->ret_path);
if (rc) goto out;
rc = libxl__xs_write_checked(gc, t, lds->cmd_path, lds->cmd);
if (rc) goto out;
rc = libxl__xs_transaction_commit(gc, &t);
if (!rc) break;
if (rc<0) goto out;
}
/* OK, wait for some callback */
return;
out:
LOG(ERROR,"logdirty switch failed (rc=%d), abandoning suspend",rc);
libxl__xs_transaction_abort(gc, &t);
switch_logdirty_done(egc,lds,rc);
}
/*
* In return, the script writes the name of REMUS_IFB device (during setup)
* to be used for output buffering into XENBUS_PATH/ifb
*/
static void netbuf_setup_script_cb(libxl__egc *egc,
libxl__async_exec_state *aes,
int rc, int status)
{
libxl__ao_device *aodev = CONTAINER_OF(aes, *aodev, aes);
libxl__checkpoint_device *dev = CONTAINER_OF(aodev, *dev, aodev);
libxl__remus_device_nic *remus_nic = dev->concrete_data;
libxl__checkpoint_devices_state *cds = dev->cds;
libxl__remus_state *rs = cds->concrete_data;
const char *out_path_base, *hotplug_error = NULL;
STATE_AO_GC(cds->ao);
/* Convenience aliases */
const uint32_t domid = cds->domid;
const int devid = remus_nic->devid;
const char *const vif = remus_nic->vif;
const char **const ifb = &remus_nic->ifb;
if (status && !rc)
rc = ERROR_FAIL;
if (rc)
goto out;
/*
* we need to get ifb first because it's needed for teardown
*/
rc = libxl__xs_read_checked(gc, XBT_NULL,
GCSPRINTF("%s/remus/netbuf/%d/ifb",
libxl__xs_libxl_path(gc, domid),
devid),
ifb);
if (rc)
goto out;
if (!(*ifb)) {
LOGD(ERROR, domid, "Cannot get ifb dev name for domain %u dev %s",
domid, vif);
rc = ERROR_FAIL;
goto out;
}
out_path_base = GCSPRINTF("%s/remus/netbuf/%d",
libxl__xs_libxl_path(gc, domid), devid);
rc = libxl__xs_read_checked(gc, XBT_NULL,
GCSPRINTF("%s/hotplug-error", out_path_base),
&hotplug_error);
if (rc)
goto out;
if (hotplug_error) {
LOGD(ERROR, domid, "netbuf script %s setup failed for vif %s: %s",
rs->netbufscript, vif, hotplug_error);
rc = ERROR_FAIL;
goto out;
}
if (status) {
rc = ERROR_FAIL;
goto out;
}
LOGD(DEBUG, domid, "%s will buffer packets from vif %s", *ifb, vif);
rc = init_qdisc(cds, remus_nic);
out:
aodev->rc = rc;
aodev->callback(egc, aodev);
}
static int libxl__device_nic_from_xenstore(libxl__gc *gc,
const char *libxl_path,
libxl_device_nic *nic)
{
const char *tmp;
int rc;
libxl_device_nic_init(nic);
rc = libxl__xs_read_checked(gc, XBT_NULL,
GCSPRINTF("%s/handle", libxl_path), &tmp);
if (rc) goto out;
if (tmp)
nic->devid = atoi(tmp);
else
nic->devid = 0;
/* nic->mtu = */
rc = libxl__xs_read_checked(gc, XBT_NULL,
GCSPRINTF("%s/mac", libxl_path), &tmp);
if (rc) goto out;
if (tmp) {
rc = libxl__parse_mac(tmp, nic->mac);
if (rc) goto out;
} else {
memset(nic->mac, 0, sizeof(nic->mac));
}
rc = libxl__xs_read_checked(NOGC, XBT_NULL,
GCSPRINTF("%s/ip", libxl_path),
(const char **)(&nic->ip));
if (rc) goto out;
rc = libxl__xs_read_checked(NOGC, XBT_NULL,
GCSPRINTF("%s/bridge", libxl_path),
(const char **)(&nic->bridge));
if (rc) goto out;
rc = libxl__xs_read_checked(NOGC, XBT_NULL,
GCSPRINTF("%s/script", libxl_path),
(const char **)(&nic->script));
if (rc) goto out;
rc = libxl__xs_read_checked(NOGC, XBT_NULL,
GCSPRINTF("%s/forwarddev", libxl_path),
(const char **)(&nic->coloft_forwarddev));
if (rc) goto out;
/* vif_ioemu nics use the same xenstore entries as vif interfaces */
rc = libxl__xs_read_checked(gc, XBT_NULL,
GCSPRINTF("%s/type", libxl_path), &tmp);
if (rc) goto out;
if (tmp) {
rc = libxl_nic_type_from_string(tmp, &nic->nictype);
if (rc) goto out;
} else {
nic->nictype = LIBXL_NIC_TYPE_VIF;
}
nic->model = NULL; /* XXX Only for TYPE_IOEMU */
nic->ifname = NULL; /* XXX Only for TYPE_IOEMU */
rc = 0;
out:
return rc;
}
