Xen devel - Jan 2009 - How is the interrupt generated for a Platform-Pci device on a HVM?

How is the interrupt generated for a platform-pci device on domU when a
notify_via_evtchn is done from dom0 to domU?

Is it this part of the code that is involved
========================================================    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;
==========================================================
Can somebody give a better explanation of how the interrupt is generated?
Thx,
Venkat



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On 23/01/2009 10:52, "Kumar, Venkat" <Venkat.Kumar@lsi.com>
wrote:
> How is the interrupt generated for a platform-pci device on domU when a
> notify_via_evtchn is done from dom0 to domU?
>  
> Is it this part of the code that is involved
Trace the code through via evtchn_set_pending(), vcpu_mark_events_pending(),
hvm_assert_evtchn_irq(), and so on.

 -- Keir



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