int evtchn_send(struct domain *d, unsigned int lport)
{
struct evtchn *lchn, *rchn;
struct domain *ld = d, *rd;
struct vcpu *rvcpu;
int rport, ret = 0;
spin_lock(&ld->event_lock);
if ( unlikely(!port_is_valid(ld, lport)) )
{
spin_unlock(&ld->event_lock);
return -EINVAL;
}
lchn = evtchn_from_port(ld, lport);
/* Guest cannot send via a Xen-attached event channel. */
if ( unlikely(consumer_is_xen(lchn)) )
{
spin_unlock(&ld->event_lock);
return -EINVAL;
}
ret = xsm_evtchn_send(ld, lchn);
if ( ret )
goto out;
switch ( lchn->state )
{
case ECS_INTERDOMAIN:
rd = lchn->u.interdomain.remote_dom;
rport = lchn->u.interdomain.remote_port;
rchn = evtchn_from_port(rd, rport);
rvcpu = rd->vcpu[rchn->notify_vcpu_id];
if ( consumer_is_xen(rchn) )
(*xen_notification_fn(rchn))(rvcpu, rport);
else
evtchn_set_pending(rvcpu, rport);
break;
case ECS_IPI:
evtchn_set_pending(ld->vcpu[lchn->notify_vcpu_id], lport);
break;
case ECS_UNBOUND:
/* silently drop the notification */
break;
default:
ret = -EINVAL;
}
out:
spin_unlock(&ld->event_lock);
return ret;
}
long evtchn_send(unsigned int lport)
{
struct evtchn *lchn, *rchn;
struct domain *ld = current->domain, *rd;
struct vcpu *rvcpu;
int rport, ret = 0;
spin_lock(&ld->evtchn_lock);
if ( unlikely(!port_is_valid(ld, lport)) )
{
spin_unlock(&ld->evtchn_lock);
return -EINVAL;
}
lchn = evtchn_from_port(ld, lport);
/* Guest cannot send via a Xen-attached event channel. */
if ( unlikely(lchn->consumer_is_xen) )
{
spin_unlock(&ld->evtchn_lock);
return -EINVAL;
}
ret = xsm_evtchn_send(ld, lchn);
if ( ret )
goto out;
switch ( lchn->state )
{
case ECS_INTERDOMAIN:
rd = lchn->u.interdomain.remote_dom;
rport = lchn->u.interdomain.remote_port;
rchn = evtchn_from_port(rd, rport);
rvcpu = rd->vcpu[rchn->notify_vcpu_id];
if ( rchn->consumer_is_xen )
{
/* Xen consumers need notification only if they are blocked. */
if ( test_and_clear_bit(_VPF_blocked_in_xen,
&rvcpu->pause_flags) )
vcpu_wake(rvcpu);
}
else
{
evtchn_set_pending(rvcpu, rport);
}
break;
case ECS_IPI:
evtchn_set_pending(ld->vcpu[lchn->notify_vcpu_id], lport);
break;
case ECS_UNBOUND:
/* silently drop the notification */
break;
default:
ret = -EINVAL;
}
out:
spin_unlock(&ld->evtchn_lock);
return ret;
}
