From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: 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 95EDACA9EC5 for ; Wed, 30 Oct 2019 12:09:25 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 642C820862 for ; Wed, 30 Oct 2019 12:09:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 642C820862 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 04EED6B0007; Wed, 30 Oct 2019 08:09:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 000416B0008; Wed, 30 Oct 2019 08:09:24 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E58F06B000A; Wed, 30 Oct 2019 08:09:24 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0120.hostedemail.com [216.40.44.120]) by kanga.kvack.org (Postfix) with ESMTP id C3A006B0007 for ; Wed, 30 Oct 2019 08:09:24 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id 7832D82499A8 for ; Wed, 30 Oct 2019 12:09:24 +0000 (UTC) X-FDA: 76100331048.08.spade65_34fdacf2b510e X-HE-Tag: spade65_34fdacf2b510e X-Filterd-Recvd-Size: 2328 Received: from gentwo.org (gentwo.org [3.19.106.255]) by imf11.hostedemail.com (Postfix) with ESMTP for ; Wed, 30 Oct 2019 12:09:24 +0000 (UTC) Received: by gentwo.org (Postfix, from userid 1002) id 549D13EF15; Wed, 30 Oct 2019 12:09:23 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by gentwo.org (Postfix) with ESMTP id 523D63EECB; Wed, 30 Oct 2019 12:09:23 +0000 (UTC) Date: Wed, 30 Oct 2019 12:09:23 +0000 (UTC) From: Christopher Lameter X-X-Sender: cl@www.lameter.com To: Mike Rapoport cc: "Kirill A. Shutemov" , linux-kernel@vger.kernel.org, Alexey Dobriyan , Andrew Morton , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Dave Hansen , James Bottomley , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , linux-api@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, Mike Rapoport Subject: Re: [PATCH RFC] mm: add MAP_EXCLUSIVE to create exclusive user mappings In-Reply-To: <20191030071136.GA20624@rapoport-lnx> Message-ID: References: <1572171452-7958-1-git-send-email-rppt@kernel.org> <1572171452-7958-2-git-send-email-rppt@kernel.org> <20191028123124.ogkk5ogjlamvwc2s@box> <20191028130018.GA7192@rapoport-lnx> <20191028131623.zwuwguhm4v4s5imh@box> <20191029085551.GA18773@rapoport-lnx> <20191030071136.GA20624@rapoport-lnx> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, 30 Oct 2019, Mike Rapoport wrote: > > /dev/securemem or so? > > A device driver will need to remove the secure area from the direct map and > then we back to square one. We have avoided the need for modifications to kernel core code. And its a natural thing to treat this like special memory provided by a device driver.