WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

RE: [Xen-devel] [VTD][patch 0/5] HVM device assignment using vt-d

To: "Guy Zana" <guy@xxxxxxxxxxxx>, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [VTD][patch 0/5] HVM device assignment using vt-d
From: "Kay, Allen M" <allen.m.kay@xxxxxxxxx>
Date: Mon, 4 Jun 2007 15:56:12 -0700
Cc: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Delivery-date: Mon, 04 Jun 2007 15:54:25 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <9392A06CB0FDC847B3A530B3DC174E7B02ADC539@xxxxxxxxxxxxxxxxxxxxxxxxxx>
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/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: Acei7YJ0pr6pL1ntT2Wzdmq3YT+WeAABwdLMABRnVWAAnH+WUAAAUYIgAFBCpiA=
Thread-topic: [Xen-devel] [VTD][patch 0/5] HVM device assignment using vt-d
 
>
>How do you plan to provide interrupts sharing with your method exactly?
>Please provide your thoughts.
>
>Thanks,
>Guy.
>

I agree with others' comments about MSI would be the ultimate solution.
In the short term, a simple stop gap meausre might be to check the
interrupt status bit in device's PCI config before delivering it
to the guest.  I found interrupt sharing with low interrupt device
such as non-storage USB is not much a problem.

It is a problem when sharing the interrupt with high freqency interrupt
devices such as SATA. The problem I encountered was the xen tried to
deliver interrupt to the guest before the guest was fully ready to
accept interrupts.

Allen

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