From mboxrd@z Thu Jan  1 00:00:00 1970
From: Juergen Gross <jgross@suse.com>
Subject: Re: [PATCH] xen: add hypercall option to temporarily
	pin a vcpu
Date: Fri, 26 Feb 2016 12:14:48 +0100
Message-ID: <56D033A8.7020009@suse.com>
References: <1456419000-390-1-git-send-email-jgross@suse.com>
 <56D0395702000078000D69A6@suse.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <56D0395702000078000D69A6@suse.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
 <mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
 <mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Errors-To: xen-devel-bounces@lists.xen.org
Sender: "Xen-devel" <xen-devel-bounces@lists.xen.org>
To: Jan Beulich <JBeulich@suse.com>
Cc: george.dunlap@eu.citrix.com, andrew.cooper3@citrix.com, dario.faggioli@citrix.com, ian.jackson@eu.citrix.com, xen-devel@lists.xen.org, dgdegra@tycho.nsa.gov
List-Id: xen-devel@lists.xenproject.org
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