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 S1754677AbdEKDX0 (ORCPT <rfc822;w@1wt.eu>);
        Wed, 10 May 2017 23:23:26 -0400
Received: from mga04.intel.com ([192.55.52.120]:46959 "EHLO mga04.intel.com"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1754134AbdEKDXZ (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 10 May 2017 23:23:25 -0400
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.38,322,1491289200"; 
   d="scan'208";a="85394237"
Message-ID: <1494473002.118905.1.camel@ranerica-desktop>
Subject: Re: [PATCH v7 20/26] x86/cpufeature: Add User-Mode Instruction
 Prevention definitions
From: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>,
        "H. Peter Anvin" <hpa@zytor.com>, Andy Lutomirski <luto@kernel.org>,
        Borislav Petkov <bp@suse.de>, Peter Zijlstra <peterz@infradead.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Brian Gerst <brgerst@gmail.com>, Chris Metcalf <cmetcalf@mellanox.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Liang Z Li <liang.z.li@intel.com>,
        Masami Hiramatsu <mhiramat@kernel.org>, Huang Rui <ray.huang@amd.com>,
        Jiri Slaby <jslaby@suse.cz>, Jonathan Corbet <corbet@lwn.net>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Paul Gortmaker <paul.gortmaker@windriver.com>,
        Vlastimil Babka <vbabka@suse.cz>, Chen Yucong <slaoub@gmail.com>,
        Alexandre Julliard <julliard@winehq.org>, Stas Sergeev <stsp@list.ru>,
        Fenghua Yu <fenghua.yu@intel.com>,
        "Ravi V. Shankar" <ravi.v.shankar@intel.com>,
        Shuah Khan <shuah@kernel.org>, linux-kernel@vger.kernel.org,
        x86@kernel.org, linux-msdos@vger.kernel.org, wine-devel@winehq.org,
        Tony Luck <tony.luck@intel.com>
Date: Wed, 10 May 2017 20:23:22 -0700
In-Reply-To: <97a69db6-4321-2d22-07f6-ba4b9400c688@redhat.com>
References: <20170505181724.55000-1-ricardo.neri-calderon@linux.intel.com>
         <20170505181724.55000-21-ricardo.neri-calderon@linux.intel.com>
         <97a69db6-4321-2d22-07f6-ba4b9400c688@redhat.com>
Content-Type: text/plain; charset="UTF-8"
X-Mailer: Evolution 3.10.4-0ubuntu2 
Mime-Version: 1.0
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 Sat, 2017-05-06 at 11:04 +0200, Paolo Bonzini wrote:
> 
> 
> On 05/05/2017 20:17, Ricardo Neri wrote:
> > User-Mode Instruction Prevention is a security feature present in
> new
> > Intel processors that, when set, prevents the execution of a subset
> of
> > instructions if such instructions are executed in user mode (CPL >
> 0).
> > Attempting to execute such instructions causes a general protection
> > exception.
> > 
> > The subset of instructions comprises:
> > 
> >  * SGDT - Store Global Descriptor Table
> >  * SIDT - Store Interrupt Descriptor Table
> >  * SLDT - Store Local Descriptor Table
> >  * SMSW - Store Machine Status Word
> >  * STR  - Store Task Register
> > 
> > This feature is also added to the list of disabled-features to allow
> > a cleaner handling of build-time configuration.
> > 
> > Cc: Andy Lutomirski <luto@kernel.org>
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > Cc: H. Peter Anvin <hpa@zytor.com>
> > Cc: Borislav Petkov <bp@suse.de>
> > Cc: Brian Gerst <brgerst@gmail.com>
> > Cc: Chen Yucong <slaoub@gmail.com>
> > Cc: Chris Metcalf <cmetcalf@mellanox.com>
> > Cc: Dave Hansen <dave.hansen@linux.intel.com>
> > Cc: Fenghua Yu <fenghua.yu@intel.com>
> > Cc: Huang Rui <ray.huang@amd.com>
> > Cc: Jiri Slaby <jslaby@suse.cz>
> > Cc: Jonathan Corbet <corbet@lwn.net>
> > Cc: Michael S. Tsirkin <mst@redhat.com>
> > Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
> > Cc: Peter Zijlstra <peterz@infradead.org>
> > Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
> > Cc: Shuah Khan <shuah@kernel.org>
> > Cc: Vlastimil Babka <vbabka@suse.cz>
> > Cc: Tony Luck <tony.luck@intel.com>
> > Cc: Paolo Bonzini <pbonzini@redhat.com>
> > Cc: Liang Z. Li <liang.z.li@intel.com>
> > Cc: Alexandre Julliard <julliard@winehq.org>
> > Cc: Stas Sergeev <stsp@list.ru>
> > Cc: x86@kernel.org
> > Cc: linux-msdos@vger.kernel.org
> > 
> > Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
> 
> Would it be possible to have this patch in a topic branch for KVM's
> consumption?
> 
I have put a branch here with this single patch:

https://github.com/ricardon/tip.git rneri/umip_for_kvm

This is based on Linux v4.11. Please let me know if this works for your
or you'd prefer it to be based on a different branch/commit/repo.

Thanks and BR,
Ricardo