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 S932150AbcGOHPv (ORCPT <rfc822;w@1wt.eu>);
	Fri, 15 Jul 2016 03:15:51 -0400
Received: from mail-pa0-f68.google.com ([209.85.220.68]:34057 "EHLO
	mail-pa0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1752503AbcGOHPu (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Fri, 15 Jul 2016 03:15:50 -0400
Date: Fri, 15 Jul 2016 15:15:46 +0800
From: Simon Guo <wei.guo.simon@gmail.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Laurent Dufour <ldufour@linux.vnet.ibm.com>,
        linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        Paul Mackerras <paulus@samba.org>, Kees Cook <keescook@chromium.org>,
        Rashmica Gupta <rashmicy@gmail.com>,
        "cyrilbur@gmail.com" <cyrilbur@gmail.com>
Subject: Re: [v4] powerpc: Export thread_struct.used_vr/used_vsr to user space
Message-ID: <20160715071546.GA5290@simonLocalRHEL7.x64>
References: <3rlZmP39HNz9sXR@ozlabs.org>
 <577E5534.70300@linux.vnet.ibm.com>
 <1467897678.27157.45.camel@kernel.crashing.org>
 <1467898167.27157.47.camel@kernel.crashing.org>
 <577f7a45.568f6b0a.bd0eb.4aa8SMTPIN_ADDED_BROKEN@mx.google.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <577f7a45.568f6b0a.bd0eb.4aa8SMTPIN_ADDED_BROKEN@mx.google.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Michael, Ben,
On Fri, Jul 08, 2016 at 08:02:42PM +1000, Michael Ellerman wrote:
> Benjamin Herrenschmidt <benh@kernel.crashing.org> writes:
> 
> > On Thu, 2016-07-07 at 23:21 +1000, Benjamin Herrenschmidt wrote:
> >> 
> >> I think the right fix is that if a restore_sigcontext() has the MSR
> >> bits set,
> >> it should set the corresponding used_* flag.
> >
> > Something like this:
> >
> > (totally untested)
> 
> Simon/Laurent, can you guys test this and let me know if it works for
> your usecase.
> 

Sorry for the late reply. I tested Ben's patch and the fix works for the CRIU
case mentioned before.

Thanks,
Simon