From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: [PATCH RFC 10/44] x86/pt-shadow: Initial infrastructure
	for L4 PV pagetable shadowing
Date: Thu, 4 Jan 2018 20:21:35 +0000
Message-ID: <1515097329-31902-11-git-send-email-andrew.cooper3@citrix.com>
References: <1515097329-31902-1-git-send-email-andrew.cooper3@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <xen-devel-bounces@lists.xenproject.org>
In-Reply-To: <1515097329-31902-1-git-send-email-andrew.cooper3@citrix.com>
List-Unsubscribe: <https://lists.xenproject.org/mailman/options/xen-devel>,
 <mailto:xen-devel-request@lists.xenproject.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xenproject.org>
List-Help: <mailto:xen-devel-request@lists.xenproject.org?subject=help>
List-Subscribe: <https://lists.xenproject.org/mailman/listinfo/xen-devel>,
 <mailto:xen-devel-request@lists.xenproject.org?subject=subscribe>
Errors-To: xen-devel-bounces@lists.xenproject.org
Sender: "Xen-devel" <xen-devel-bounces@lists.xenproject.org>
To: Xen-devel <xen-devel@lists.xen.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
List-Id: xen-devel@lists.xenproject.org
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