From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: [Patch] use full-size cpumask for vcpu-pin
Date: Tue, 10 Aug 2010 15:27:54 +0100
Message-ID: <C887207A.1D484%keir.fraser@eu.citrix.com>
References: <19553.24054.564316.142633@mariner.uk.xensource.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <19553.24054.564316.142633@mariner.uk.xensource.com>
List-Unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: Ian Jackson <Ian.Jackson@eu.citrix.com>, Juergen Gross <juergen.gross@ts.fujitsu.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org

On 10/08/2010 15:11, "Ian Jackson" <Ian.Jackson@eu.citrix.com> wrote:

> Juergen Gross writes ("[Xen-devel] [Patch] use full-size cpumask for
> vcpu-pin"):
>> The reason is the allocation of the cpumap for pinning: the size is only for
>> the ACTUAL number of physical cpus in the system, not the possible number.
>> The solution is to allocate a cpumap for up to NR_CPUS.
> 
> Thanks for this patch.  However, this doesn't seem to be even slightly
> backwards-compatible, because it changes the layout of the physinfo
> sysctl response.

The domctl and sysctl hypercalls do not need to be backward compatible
across major Xen releases. All other hypercalls absolutely do.

 -- Keir