From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefano Stabellini <sstabellini@kernel.org>
Subject: [PATCH v3 09/13] xen/pvcalls: implement sendmsg
Date: Mon, 31 Jul 2017 15:57:31 -0700
Message-ID: <1501541855-7354-9-git-send-email-sstabellini@kernel.org>
References: <alpine.DEB.2.10.1707311536460.22381@sstabellini-ThinkPad-X260>
 <1501541855-7354-1-git-send-email-sstabellini@kernel.org>
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: <1501541855-7354-1-git-send-email-sstabellini@kernel.org>
List-Unsubscribe: <https://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: <https://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: xen-devel@lists.xen.org
Cc: jgross@suse.com, Stefano Stabellini <stefano@aporeto.com>, boris.ostrovsky@oracle.com, sstabellini@kernel.org, linux-kernel@vger.kernel.org
List-Id: xen-devel@lists.xenproject.org
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