From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: [PATCH for-4.8] x86/svm: Don't clobber eax and edx if
	an RDMSR intercept fails
Date: Wed, 9 Nov 2016 12:28:27 +0000
Message-ID: <1478694507-26060-1-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.xen.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 <xen-devel@lists.xen.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Wei Liu <wei.liu2@citrix.com>, Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>, Jan Beulich <JBeulich@suse.com>
List-Id: xen-devel@lists.xenproject.org
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