long evtchn_bind_vcpu(unsigned int port, unsigned int vcpu_id)
{
struct domain *d = current->domain;
struct evtchn *chn;
long rc = 0;
if ( (vcpu_id >= d->max_vcpus) || (d->vcpu[vcpu_id] == NULL) )
return -ENOENT;
spin_lock(&d->event_lock);
if ( !port_is_valid(d, port) )
{
rc = -EINVAL;
goto out;
}
chn = evtchn_from_port(d, port);
/* Guest cannot re-bind a Xen-attached event channel. */
if ( unlikely(consumer_is_xen(chn)) )
{
rc = -EINVAL;
goto out;
}
switch ( chn->state )
{
case ECS_VIRQ:
if ( virq_is_global(chn->u.virq) )
chn->notify_vcpu_id = vcpu_id;
else
rc = -EINVAL;
break;
case ECS_UNBOUND:
case ECS_INTERDOMAIN:
chn->notify_vcpu_id = vcpu_id;
break;
case ECS_PIRQ:
if ( chn->notify_vcpu_id == vcpu_id )
break;
unlink_pirq_port(chn, d->vcpu[chn->notify_vcpu_id]);
chn->notify_vcpu_id = vcpu_id;
pirq_set_affinity(d, chn->u.pirq.irq,
cpumask_of(d->vcpu[vcpu_id]->processor));
link_pirq_port(port, chn, d->vcpu[vcpu_id]);
break;
default:
rc = -EINVAL;
break;
}
out:
spin_unlock(&d->event_lock);
return rc;
}
static long evtchn_bind_pirq(evtchn_bind_pirq_t *bind)
{
struct evtchn *chn;
struct domain *d = current->domain;
struct vcpu *v = d->vcpu[0];
struct pirq *info;
int port, pirq = bind->pirq;
long rc;
if ( (pirq < 0) || (pirq >= d->nr_pirqs) )
return -EINVAL;
if ( !is_hvm_domain(d) && !irq_access_permitted(d, pirq) )
return -EPERM;
spin_lock(&d->event_lock);
if ( pirq_to_evtchn(d, pirq) != 0 )
ERROR_EXIT(-EEXIST);
if ( (port = get_free_port(d)) < 0 )
ERROR_EXIT(port);
chn = evtchn_from_port(d, port);
info = pirq_get_info(d, pirq);
if ( !info )
ERROR_EXIT(-ENOMEM);
info->evtchn = port;
rc = (!is_hvm_domain(d)
? pirq_guest_bind(v, info,
!!(bind->flags & BIND_PIRQ__WILL_SHARE))
: 0);
if ( rc != 0 )
{
info->evtchn = 0;
pirq_cleanup_check(info, d);
goto out;
}
chn->state = ECS_PIRQ;
chn->u.pirq.irq = pirq;
link_pirq_port(port, chn, v);
bind->port = port;
#ifdef CONFIG_X86
if ( is_hvm_domain(d) && domain_pirq_to_irq(d, pirq) > 0 )
map_domain_emuirq_pirq(d, pirq, IRQ_PT);
#endif
out:
spin_unlock(&d->event_lock);
return rc;
}
static long evtchn_bind_pirq(evtchn_bind_pirq_t *bind)
{
struct evtchn *chn;
struct domain *d = current->domain;
struct vcpu *v = d->vcpu[0];
int port, pirq = bind->pirq;
long rc;
if ( (pirq < 0) || (pirq >= d->nr_pirqs) )
return -EINVAL;
if ( !is_hvm_domain(d) && !irq_access_permitted(d, pirq) )
return -EPERM;
spin_lock(&d->event_lock);
if ( d->pirq_to_evtchn[pirq] != 0 )
ERROR_EXIT(-EEXIST);
if ( (port = get_free_port(d)) < 0 )
ERROR_EXIT(port);
chn = evtchn_from_port(d, port);
d->pirq_to_evtchn[pirq] = port;
rc = (!is_hvm_domain(d)
? pirq_guest_bind(
v, pirq, !!(bind->flags & BIND_PIRQ__WILL_SHARE))
: 0);
if ( rc != 0 )
{
d->pirq_to_evtchn[pirq] = 0;
goto out;
}
chn->state = ECS_PIRQ;
chn->u.pirq.irq = pirq;
link_pirq_port(port, chn, v);
bind->port = port;
if ( is_hvm_domain(d) && domain_pirq_to_irq(d, pirq) > 0 )
map_domain_emuirq_pirq(d, pirq, IRQ_PT);
out:
spin_unlock(&d->event_lock);
return rc;
}
