From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH v9 02/11] x86/cpuid: Handling of IBRS/IBPB,
 STIBP and IBRS for guests
Date: Fri, 19 Jan 2018 15:00:54 +0000
Message-ID: <c366f692-fb47-5ac5-227b-00f7e8b6e7f2@citrix.com>
References: <1516290370-14958-1-git-send-email-andrew.cooper3@citrix.com>
 <1516290370-14958-3-git-send-email-andrew.cooper3@citrix.com>
 <5A61D91102000078001A0481@prv-mh.provo.novell.com>
 <86dc061f-afa7-b260-b096-b6efbf464dec@citrix.com>
 <5A61E89202000078001A0556@prv-mh.provo.novell.com>
 <6e6b06da-c6b1-0972-b078-4d351d1ef2c7@citrix.com>
 <5A61EE6B02000078001A0595@prv-mh.provo.novell.com>
 <98317d94-a80c-57be-1919-e40fe834188e@citrix.com>
 <5A61F80202000078001A05D6@prv-mh.provo.novell.com>
 <e88cedd2-a37d-5725-f6c9-fccfa5fdbfc1@citrix.com>
 <5A6201AE02000078001A060C@prv-mh.provo.novell.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: <5A6201AE02000078001A060C@prv-mh.provo.novell.com>
Content-Language: en-GB
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: Jan Beulich <JBeulich@suse.com>
Cc: Xen-devel <xen-devel@lists.xen.org>
List-Id: xen-devel@lists.xenproject.org
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