[Xen-devel] How is the interrupt generated for a Platform-Pci de

To:	"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	[Xen-devel] How is the interrupt generated for a Platform-Pci device on a HVM?
From:	"Kumar, Venkat" <Venkat.Kumar@xxxxxxx>
Date:	Fri, 23 Jan 2009 16:22:08 +0530
Accept-language:	en-US
Acceptlanguage:	en-US
Delivery-date:	Fri, 23 Jan 2009 02:57:55 -0800
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxxx
List-help:	<mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id:	Xen developer discussion <xen-devel.lists.xensource.com>
List-post:	<mailto:xen-devel@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index:	Acl9SKL7aBBEt4zFTJmbc6OXxR+B3w==
Thread-topic:	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

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

WARNING - OLD ARCHIVES