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/
Home Products Support Community News


Re: [Xen-devel] Local APIC doesn't implement "One shot" mode?

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Local APIC doesn't implement "One shot" mode?
From: alarson@xxxxxxxx
Date: Tue, 23 Nov 2010 12:49:31 -0600
Delivery-date: Tue, 23 Nov 2010 10:50:34 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <C9117AAD.AD7C%keir@xxxxxxx>
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
xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote on 11/23/2010 08:05:33 AM:

AL> On 23/11/2010 14:00, "alarson@xxxxxxxx" <alarson@xxxxxxxx> wrote:

AL> However it appears that the Local APIC presented to the client
AL> only implements the "periodic" timer mode, and not "one shot" (bit
AL> 17 of the APIC Local Vector Table).  ...

KF> You are correct in your observation. If you care about correct
KF> one-shot behaviour for reads of the current-count register, I can
KF> propose a patch for you to test?

Certainly.  I may not get a chance to test it until next week though,
depending on HW scheduling.

Xen-devel mailing list