From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=5Yga=VJ=vger.kernel.org=linux-fsdevel-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
X-Spam-Level: 
X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,
	MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no
	autolearn_force=no version=3.4.0
Received: from mail.kernel.org (mail.kernel.org [198.145.29.99])
	by smtp.lore.kernel.org (Postfix) with ESMTP id B81F1C742BD
	for <linux-fsdevel@archiver.kernel.org>; Fri, 12 Jul 2019 15:11:36 +0000 (UTC)
Received: from vger.kernel.org (vger.kernel.org [209.132.180.67])
	by mail.kernel.org (Postfix) with ESMTP id 9C2F921670
	for <linux-fsdevel@archiver.kernel.org>; Fri, 12 Jul 2019 15:11:36 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1727106AbfGLPLc (ORCPT
        <rfc822;linux-fsdevel@archiver.kernel.org>);
        Fri, 12 Jul 2019 11:11:32 -0400
Received: from verein.lst.de ([213.95.11.211]:38899 "EHLO verein.lst.de"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1726977AbfGLPLc (ORCPT <rfc822;linux-fsdevel@vger.kernel.org>);
        Fri, 12 Jul 2019 11:11:32 -0400
Received: by verein.lst.de (Postfix, from userid 2407)
        id 7887F227A81; Fri, 12 Jul 2019 17:11:29 +0200 (CEST)
Date:   Fri, 12 Jul 2019 17:11:29 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Halil Pasic <pasic@linux.ibm.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        Thiago Jung Bauermann <bauerman@linux.ibm.com>,
        x86@kernel.org, iommu@lists.linux-foundation.org,
        linux-fsdevel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Mike Anderson <andmike@linux.ibm.com>,
        Ram Pai <linuxram@us.ibm.com>
Subject: Re: [PATCH 3/3] fs/core/vmcore: Move sev_active() reference to x86
 arch code
Message-ID: <20190712151129.GA30636@lst.de>
References: <20190712053631.9814-1-bauerman@linux.ibm.com> <20190712053631.9814-4-bauerman@linux.ibm.com> <20190712150912.3097215e.pasic@linux.ibm.com> <20190712140812.GA29628@lst.de> <20190712165153.78d49095.pasic@linux.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20190712165153.78d49095.pasic@linux.ibm.com>
User-Agent: Mutt/1.5.17 (2007-11-01)
Sender: linux-fsdevel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-fsdevel.vger.kernel.org>
X-Mailing-List: linux-fsdevel@vger.kernel.org

On Fri, Jul 12, 2019 at 04:51:53PM +0200, Halil Pasic wrote:
> Thank you very much! I will have another look, but it seems to me,
> without further measures taken, this would break protected virtualization
> support on s390. The effect of the che for s390 is that
> force_dma_unencrypted() will always return false instead calling into
> the platform code like it did before the patch, right?
> 
> Should I send a  Fixes: e67a5ed1f86f "dma-direct: Force unencrypted DMA
> under SME for certain DMA masks" (Tom Lendacky, 2019-07-10) patch that
> rectifies things for s390 or how do we want handle this?

Yes, please do.  I hadn't noticed the s390 support had landed in
mainline already.