Re: [Xen-devel] [PATCH] xen: do not re-use pirq number cached in pci device msi msg data

[Boris Ostrovsky]

>> In the Xen code I can still see:
>>
>>     case ECS_PIRQ: {
>>         struct pirq *pirq = pirq_info(d1, chn1->u.pirq.irq);
>>
>>         if ( !pirq )
>>             break;
>>         if ( !is_hvm_domain(d1) )
>>             pirq_guest_unbind(d1, pirq);
>>
>> which means that pirq_guest_unbind should only be called on evtchn_close
>> if the guest is not an HVM guest.

A few lines further down we have:

        pirq->evtchn = 0;
        pirq_cleanup_check(pirq, d1);
        unlink_pirq_port(chn1, d1->vcpu[chn1->notify_vcpu_id]);
#ifdef CONFIG_X86
        if ( is_hvm_domain(d1) && domain_pirq_to_irq(d1, pirq->pirq) > 0 )
            unmap_domain_pirq_emuirq(d1, pirq->pirq);
#endif

which is where we free up the pirq.

-boris