[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v4 05/10] evtchn: closing of vIRQ-s doesn't require looping over all vCPU-s
Global vIRQ-s have their event channel association tracked on vCPU 0. Per-vCPU vIRQ-s can't have their notify_vcpu_id changed. Hence it is well-known which vCPU's virq_to_evtchn[] needs updating. Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> --- v4: New. --- a/xen/common/event_channel.c +++ b/xen/common/event_channel.c @@ -600,7 +600,6 @@ static long evtchn_bind_pirq(evtchn_bind int evtchn_close(struct domain *d1, int port1, bool guest) { struct domain *d2 = NULL; - struct vcpu *v; struct evtchn *chn1, *chn2; int port2; long rc = 0; @@ -651,17 +650,19 @@ int evtchn_close(struct domain *d1, int break; } - case ECS_VIRQ: - for_each_vcpu ( d1, v ) - { - unsigned long flags; + case ECS_VIRQ: { + struct vcpu *v; + unsigned long flags; + + v = d1->vcpu[virq_is_global(chn1->u.virq) ? 0 : chn1->notify_vcpu_id]; + + write_lock_irqsave(&v->virq_lock, flags); + ASSERT(read_atomic(&v->virq_to_evtchn[chn1->u.virq]) == port1); + write_atomic(&v->virq_to_evtchn[chn1->u.virq], 0); + write_unlock_irqrestore(&v->virq_lock, flags); - write_lock_irqsave(&v->virq_lock, flags); - if ( read_atomic(&v->virq_to_evtchn[chn1->u.virq]) == port1 ) - write_atomic(&v->virq_to_evtchn[chn1->u.virq], 0); - write_unlock_irqrestore(&v->virq_lock, flags); - } break; + } case ECS_IPI: break;
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