From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1752879AbdLEMTc (ORCPT <rfc822;w@1wt.eu>);
        Tue, 5 Dec 2017 07:19:32 -0500
Received: from mx2.suse.de ([195.135.220.15]:55351 "EHLO mx2.suse.de"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1752589AbdLEMTb (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Tue, 5 Dec 2017 07:19:31 -0500
Subject: Re: [patch 25/60] x86/paravirt: Provide a way to check for
 hypervisors
To: Thomas Gleixner <tglx@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>,
        Andy Lutomirsky <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Dave Hansen <dave.hansen@intel.com>, Borislav Petkov <bpetkov@suse.de>,
        Greg KH <gregkh@linuxfoundation.org>, keescook@google.com,
        hughd@google.com, Brian Gerst <brgerst@gmail.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Denys Vlasenko <dvlasenk@redhat.com>, Rik van Riel <riel@redhat.com>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        David Laight <David.Laight@aculab.com>,
        Eduardo Valentin <eduval@amazon.com>, aliguori@amazon.com,
        Will Deacon <will.deacon@arm.com>, daniel.gruss@iaik.tugraz.at
References: <20171204140706.296109558@linutronix.de>
 <20171204150606.912938129@linutronix.de>
From: Juergen Gross <jgross@suse.com>
Message-ID: <945d88a5-0fc0-b4f5-e104-c18493161d29@suse.com>
Date: Tue, 5 Dec 2017 13:19:29 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.4.0
MIME-Version: 1.0
In-Reply-To: <20171204150606.912938129@linutronix.de>
Content-Type: text/plain; charset=iso-8859-15
Content-Language: de-DE
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 04/12/17 15:07, Thomas Gleixner wrote:
> From: Thomas Gleixner <tglx@linutronix.de>
> 
> There is no generic way to test whether a kernel is running on a specific
> hypervisor. But that's required to prevent the upcoming user address space
> separation feature in certain guest modes.
> 
> Make the hypervisor type enum unconditionally available and provide a
> helper function which allows to test for a specific type.
> 
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Reviewed-by: Juergen Gross <jgross@suse.com>


Juergen