int xc_suspend_evtchn_init(xc_interface *xch, xc_evtchn *xce, int domid, int port)
{
int rc, suspend_evtchn = -1;
if (lock_suspend_event(xch, domid))
return -EINVAL;
suspend_evtchn = xc_evtchn_bind_interdomain(xce, domid, port);
if (suspend_evtchn < 0) {
ERROR("failed to bind suspend event channel: %d", suspend_evtchn);
goto cleanup;
}
rc = xc_domain_subscribe_for_suspend(xch, domid, port);
if (rc < 0) {
ERROR("failed to subscribe to domain: %d", rc);
goto cleanup;
}
/* event channel is pending immediately after binding */
xc_await_suspend(xch, xce, suspend_evtchn);
return suspend_evtchn;
cleanup:
xc_suspend_evtchn_release(xch, xce, domid, suspend_evtchn);
return -1;
}
int xc_suspend_evtchn_init_exclusive(xc_interface *xch, xc_evtchn *xce,
int domid, int port, int *lockfd)
{
int suspend_evtchn;
suspend_evtchn = xc_suspend_evtchn_init_sane(xch, xce, domid, port, lockfd);
if (suspend_evtchn < 0)
return suspend_evtchn;
/* event channel is pending immediately after binding */
xc_await_suspend(xch, xce, suspend_evtchn);
return suspend_evtchn;
}
static int suspend_guest(xc_interface *xch, xc_evtchn *xce, int domid,
int *evtchn, int *lockfd)
{
int port, rc, suspend_evtchn = -1;
*lockfd = -1;
if (!evtchn)
return -1;
port = xs_suspend_evtchn_port(domid);
if (port < 0)
{
fprintf(stderr, "DOM%d: No suspend port, try live migration\n", domid);
goto failed;
}
suspend_evtchn = xc_suspend_evtchn_init_exclusive(xch, xce, domid,
port, lockfd);
if (suspend_evtchn < 0)
{
fprintf(stderr, "Suspend evtchn initialization failed\n");
goto failed;
}
*evtchn = suspend_evtchn;
rc = xc_evtchn_notify(xce, suspend_evtchn);
if (rc < 0)
{
fprintf(stderr, "Failed to notify suspend channel: errno %d\n", rc);
goto failed;
}
if (xc_await_suspend(xch, xce, suspend_evtchn) < 0)
{
fprintf(stderr, "Suspend Failed\n");
goto failed;
}
return 0;
failed:
if (suspend_evtchn != -1)
xc_suspend_evtchn_release(xch, xce, domid,
suspend_evtchn, lockfd);
return -1;
}