From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752719AbcADQPO (ORCPT ); Mon, 4 Jan 2016 11:15:14 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:45944 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752516AbcADQPK (ORCPT ); Mon, 4 Jan 2016 11:15:10 -0500 Subject: Re: [Xen-devel] [PATCH RFC 3/3] xen/Kconfig: add XEN_TIME_VSYSCALL option To: David Vrabel , Joao Martins , linux-kernel@vger.kernel.org, xen-devel@lists.xen.org References: <1451339557-24473-1-git-send-email-joao.m.martins@oracle.com> <1451339557-24473-4-git-send-email-joao.m.martins@oracle.com> <568A99DA.6000705@citrix.com> Cc: x86@kernel.org, Ingo Molnar , "H. Peter Anvin" , Thomas Gleixner From: Boris Ostrovsky Message-ID: <568A9A88.8060702@oracle.com> Date: Mon, 4 Jan 2016 11:15:04 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 In-Reply-To: <568A99DA.6000705@citrix.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/04/2016 11:12 AM, David Vrabel wrote: > On 28/12/15 21:52, Joao Martins wrote: >> This option enables support for pvclock vsyscall/vdso >> support on Xen. Default is off, since Xen doesn't >> expose yet the PVCLOCK_TSC_STABLE_BIT flag. > Do we need a Kconfig option for this? I think this should always be > enabled. > > The kernel support won't be merged until the hypervisor changes have > been accepted. I agree. xen_setup_vsyscall_time_info() will (harmlessly) fail if PVCLOCK_TSC_STABLE_BIT is not set. -boris