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 76BBBC7618F for ; Mon, 15 Jul 2019 08:28:30 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 449EA205F4 for ; Mon, 15 Jul 2019 08:28:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 449EA205F4 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id D5F586B000E; Mon, 15 Jul 2019 04:28:29 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id CE96B6B0010; Mon, 15 Jul 2019 04:28:29 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B64736B0266; Mon, 15 Jul 2019 04:28:29 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) by kanga.kvack.org (Postfix) with ESMTP id 619436B000E for ; Mon, 15 Jul 2019 04:28:29 -0400 (EDT) Received: by mail-wm1-f70.google.com with SMTP id v125so3747501wme.5 for ; Mon, 15 Jul 2019 01:28:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:date:from:to :cc:subject:in-reply-to:message-id:references:user-agent :mime-version; bh=ZI59Obl45UF1mQBOMQqzF1+nbTJngjjz72dAyoLdS2I=; b=t6zkvbPh9WgXfi5IqeQ2JTemrFBayOqKnRj6HmeipR03PuZT0Y138Q1QchsslNUXsy q3aCk+dKy1B8J15z0FVtrM8dN8m9kVAfUI2bDHXWpEy8TenecjDWanLKp3MF9G7XCKOZ IwWVliSg0HkAk9eLCH9qdv5oe3hvap1dwqD9gUli7L7iK97gOVrzgu+65VSlz1idO15I Opb+fKq9o+kNXRNFQL6VrsZtLxL0qnHFvKpDaPJdgyQUoqrJYLZj3gcH8gqay9jzes4M s4SNa7bA5IGJWpGovKh8pCDtd4aIKovBW+ePMSSMHwkAoivLn8jcSPZ524YgrpGZK/qu c13Q== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of tglx@linutronix.de designates 2a0a:51c0:0:12e:550::1 as permitted sender) smtp.mailfrom=tglx@linutronix.de X-Gm-Message-State: APjAAAV1g5VGJdppDa/sIFRg/gGtLxMJ4DoxObUWYo9QlV+Fdp9Pa7Dj 8hnrF9WKxXl86Y/CKGtLz4TydkCBvCDTJTTRN5Sjsw1elCBNXBKniF8CaaJmHKBThYM3tMtgXmb WbIh7MqVZOW13GL/QvNPLVSL8FKDIwBGUXHH/DLZPsZ6D3tfCRffbFNWwnLypfTGwuA== X-Received: by 2002:a1c:f914:: with SMTP id x20mr13716181wmh.142.1563179308841; Mon, 15 Jul 2019 01:28:28 -0700 (PDT) X-Google-Smtp-Source: APXvYqy3G9d2yUqI1XMaEcYqPCHuG6zECRsjtDa/q25xE7JDeR+B0KQiHzT+UqqDSAepf1ZphbRj X-Received: by 2002:a1c:f914:: with SMTP id x20mr13716092wmh.142.1563179308056; Mon, 15 Jul 2019 01:28:28 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1563179308; cv=none; d=google.com; s=arc-20160816; b=KNXRQNms7SmoPm5GdBLGeAo2WRQQZjrMtbWl1qUE64fZPiWIKpIYbHR9V2pGygpvT0 gTeSaARCSvRixfYrZGIxf8LtL30RKOVTY/KWWqzaZLjL0enByDBUbNCwRw/NN61bUTBs pi6DxHsU69dOVi8peJ6a1UttzUQi4ZGNRS+hS6AxENRD48pGOwAY+vKEfw7GC9Gp+P9L TGznoUYHE8//IMHJ803EjI+1KaH8MS053J7tcQKqNDDaBmcAXbWf4D9rdZhYLL/XaKvf ibfWKwUNcR4+/lBAcx7/xuL/78m4Pp7k6XJ4U2t5rJxtTjKEPP+U+kMf+HSHWZpeGhF1 nYZQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:message-id:in-reply-to:subject :cc:to:from:date; bh=ZI59Obl45UF1mQBOMQqzF1+nbTJngjjz72dAyoLdS2I=; b=F61lDZ8USMN4MSk1Ce2cp+zG6dRwYdI0cF2PnFtJ6MhACkntj0zgtnyrkexqZ75xUy mVttWjleks/gxC91/EUhZ+LSJl0FQP5c6zmCllI7Ko/VxjuPr5U37pOx+4r4XqUkxhe5 gdJGuleWKDHJtk6TBCXDB4qwcmBS2zLT2t+FfBPSJbNP3kvGc8spSW8qLZ1mxb35jzvw bXWZKZnLueIXF/7YnQGk3RSeRAXqFctKxrg0M4D2VxuDFVeNOXj/bBPXSBGK2TuhweVg RyJG/PU/ctLVXeggnFehFkFAuewD7B14lX72pDLqDkMTcsSAny3jwVH6l2RHly+B6aNv lwkA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of tglx@linutronix.de designates 2a0a:51c0:0:12e:550::1 as permitted sender) smtp.mailfrom=tglx@linutronix.de Received: from Galois.linutronix.de (Galois.linutronix.de. [2a0a:51c0:0:12e:550::1]) by mx.google.com with ESMTPS id o143si13746648wme.57.2019.07.15.01.28.27 for (version=TLS1_2 cipher=AES128-SHA bits=128/128); Mon, 15 Jul 2019 01:28:28 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of tglx@linutronix.de designates 2a0a:51c0:0:12e:550::1 as permitted sender) client-ip=2a0a:51c0:0:12e:550::1; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of tglx@linutronix.de designates 2a0a:51c0:0:12e:550::1 as permitted sender) smtp.mailfrom=tglx@linutronix.de Received: from pd9ef1cb8.dip0.t-ipconnect.de ([217.239.28.184] helo=nanos) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1hmwLE-0005Ij-RB; Mon, 15 Jul 2019 10:28:12 +0200 Date: Mon, 15 Jul 2019 10:28:11 +0200 (CEST) From: Thomas Gleixner To: Alexandre Chartre cc: Peter Zijlstra , Dave Hansen , pbonzini@redhat.com, rkrcmar@redhat.com, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, kvm@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, konrad.wilk@oracle.com, jan.setjeeilers@oracle.com, liran.alon@oracle.com, jwadams@google.com, graf@amazon.de, rppt@linux.vnet.ibm.com, Paul Turner Subject: Re: [RFC v2 00/27] Kernel Address Space Isolation In-Reply-To: Message-ID: References: <1562855138-19507-1-git-send-email-alexandre.chartre@oracle.com> <5cab2a0e-1034-8748-fcbe-a17cf4fa2cd4@intel.com> <61d5851e-a8bf-e25c-e673-b71c8b83042c@oracle.com> <20190712125059.GP3419@hirez.programming.kicks-ass.net> <3ca70237-bf8e-57d9-bed5-bc2329d17177@oracle.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 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: Alexandre, On Mon, 15 Jul 2019, Alexandre Chartre wrote: > On 7/12/19 9:48 PM, Thomas Gleixner wrote: > > As I said before, come up with a list of possible usage scenarios and > > protection scopes first and please take all the ideas other people have > > with this into account. This includes PTI of course. > > > > Once we have that we need to figure out whether these things can actually > > coexist and do not contradict each other at the semantical level and > > whether the outcome justifies the resulting complexity. > > > > After that we can talk about implementation details. > > Right, that makes perfect sense. I think so far we have the following > scenarios: > > - PTI > - KVM (i.e. VMExit handler isolation) > - maybe some syscall isolation? Vs. the latter you want to talk to Paul Turner. He had some ideas there. > I will look at them in more details, in particular what particular > mappings they need and when they need to switch mappings. > > And thanks for putting me back on the right track. That's what maintainers are for :) Thanks, tglx