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 S1753873AbdJPVZy (ORCPT <rfc822;w@1wt.eu>);
        Mon, 16 Oct 2017 17:25:54 -0400
Received: from mail.skyhub.de ([5.9.137.197]:40342 "EHLO mail.skyhub.de"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1753094AbdJPVZx (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 16 Oct 2017 17:25:53 -0400
Date: Mon, 16 Oct 2017 23:25:45 +0200
From: Borislav Petkov <bp@alien8.de>
To: Brijesh Singh <brijesh.singh@amd.com>
Cc: x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
        linux-kernel@vger.kernel.org, Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: [Part1 PATCH v6.1 14/17] x86: Add support for changing memory
 encryption attribute in early boot
Message-ID: <20171016212545.5ydc333rxjons35b@pd.tnic>
References: <20171016153423.2980-15-brijesh.singh@amd.com>
 <20171016195608.122752-1-brijesh.singh@amd.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <20171016195608.122752-1-brijesh.singh@amd.com>
User-Agent: NeoMutt/20170113 (1.7.2)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Mon, Oct 16, 2017 at 02:56:08PM -0500, Brijesh Singh wrote:
> Some KVM-specific custom MSRs share the guest physical address with the
> hypervisor in early boot. When SEV is active, the shared physical address
> must be mapped with memory encryption attribute cleared so that both
> hypervisor and guest can access the data.
> 
> Add APIs to change the memory encryption attribute in early boot code.
> 
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: Borislav Petkov <bp@suse.de>
> Cc: x86@kernel.org
> Cc: linux-kernel@vger.kernel.org
> Cc: Tom Lendacky <thomas.lendacky@amd.com>
> Improvements-by: Borislav Petkov <bp@suse.de>
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
> ---
> 
> Changes since v6:
>  * applied the improvements from Boris
> 
>  arch/x86/include/asm/mem_encrypt.h |   8 +++
>  arch/x86/mm/mem_encrypt.c          | 131 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 139 insertions(+)

Reviewed-by: Borislav Petkov <bp@suse.de>

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.