Re: [Xen-devel] [RFC] [PATCH] [XEN] [ACM] Enable updating policy

To:	Stefan Berger <stefanb@xxxxxxxxxx>
Subject:	Re: [Xen-devel] [RFC] [PATCH] [XEN] [ACM] Enable updating policy on running system
From:	Keir Fraser <keir@xxxxxxxxxxxxx>
Date:	Fri, 20 Apr 2007 17:46:40 +0100
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date:	Fri, 20 Apr 2007 09:45:30 -0700
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxx
In-reply-to:	<OFF73A2046.DB192AB3-ON852572C3.00559620-852572C3.0058174A@xxxxxxxxxx>
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:	AceDa3frtkZ9v+9eEduiOwAX8io7RQ==
Thread-topic:	[Xen-devel] [RFC] [PATCH] [XEN] [ACM] Enable updating policy on running system
User-agent:	Microsoft-Entourage/11.3.3.061214

On 20/4/07 17:02, "Stefan Berger" <stefanb@xxxxxxxxxx> wrote:

>
> Anyway, in response to your main question, I wonder what you actually need
> to serialise against? Is it sufficient to just sync against domain creation
> -- what if event channels or grant mappings are also occurring during the
> policy change? Is there some specific part of domain creation you need to
> serialise against?

While the policy update is happening, a domain could be created with a label that is about to be modified or even deleted as part of the policy update.

When a label is associated with a domain, doesn’t that call into ACM code? In which case you could define your own locking against that event.

-- Keir

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

WARNING - OLD ARCHIVES

xen-devel

Re: [Xen-devel] [RFC] [PATCH] [XEN] [ACM] Enable updating policy on runn