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] Xeno Linux never pins L1 tables ?

To: Satya <satyakiran@xxxxxxxxx>
Subject: Re: [Xen-devel] Xeno Linux never pins L1 tables ?
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 16 Oct 2007 14:18:00 -0700
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Tue, 16 Oct 2007 14:18:41 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <acbcf3840710161359x40cd6d08xe6178c4438500efd@xxxxxxxxxxxxxx>
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>
References: <acbcf3840710160744t52246df7se931e65b4d7651e0@xxxxxxxxxxxxxx> <471517B9.1040102@xxxxxxxx> <acbcf3840710161359x40cd6d08xe6178c4438500efd@xxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Thunderbird 2.0.0.5 (X11/20070727)
Satya wrote:
> Wonder what happens if an L1 page is created *after* a PGD is pinned ?
> I think I have to explicitly pin the L1 page then? or unlikely( does
> Xen pin it when I map into into the pinned PGD using a hypercall )

When you update the L2 entry to point to the L1, Xen checks to make sure
the L1 page is all OK (read-only, valid contents), then pins it to the
rest of the pagetable.

    J

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