From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S940548AbdEZOTG (ORCPT ); Fri, 26 May 2017 10:19:06 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:49087 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752105AbdEZOTE (ORCPT ); Fri, 26 May 2017 10:19:04 -0400 Subject: Re: [PATCH v2 2/2] xen: add sysfs node for guest type To: Juergen Gross , linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org References: <20170526125657.24505-1-jgross@suse.com> <20170526125657.24505-3-jgross@suse.com> Cc: gregkh@linuxfoundation.org From: Boris Ostrovsky Message-ID: <14c0303e-35d3-6e72-e38b-501a26a2a3a9@oracle.com> Date: Fri, 26 May 2017 10:18:48 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <20170526125657.24505-3-jgross@suse.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/26/2017 08:56 AM, Juergen Gross wrote: > Currently there is no reliable user interface inside a Xen guest to > determine its type (e.g. HVM, PV or PVH). Instead of letting user mode > try to determine this by various rather hacky mechanisms (parsing of > boot messages before they are gone, trying to make use of known subtle > differences in behavior of some instructions), add a sysfs node > /sys/hypervisor/guest_type to explicitly deliver this information as > it is known to the kernel. > > Signed-off-by: Juergen Gross Reviewed-by: Boris Ostrovsky (I would have preferred to have /sys/hypervisor/xen/ but given that some of the other files have been around for ages, and are now declared stable, it's too late).