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=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS autolearn=unavailable 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 0B39BC04AB1 for ; Mon, 13 May 2019 15:46:38 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BBE672168B for ; Mon, 13 May 2019 15:46:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="mImlR6Is" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BBE672168B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 580B96B027D; Mon, 13 May 2019 11:46:37 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 532926B027E; Mon, 13 May 2019 11:46:37 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4210A6B027F; Mon, 13 May 2019 11:46:37 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-pf1-f200.google.com (mail-pf1-f200.google.com [209.85.210.200]) by kanga.kvack.org (Postfix) with ESMTP id 0F7546B027D for ; Mon, 13 May 2019 11:46:37 -0400 (EDT) Received: by mail-pf1-f200.google.com with SMTP id i123so9840306pfb.19 for ; Mon, 13 May 2019 08:46:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:dkim-signature:mime-version:references :in-reply-to:from:date:message-id:subject:to:cc; bh=CX+WwNrHxbi6+vKJH849ujFTw6wRLqJatbYNgyEeksI=; b=L9uktc4FAi0DyVeETt2YtxvkU4Ya2zMt0TaVim1Y1ci8GY4QBw1DplCgvCKd6vWTIH +VcVi2vgn9FpneXfUgEORoP1gsCHUEm/gksY8BKGW73SDwZ6O5e4tCklhbtsQvcTBgVt aLkhAlTBqBOmp3qqHGETwXe+eJBmMG3LqAEiqjkJgjqh3nsIR0p+S5tD2vjyDntcd6WY KtCE/vSyzehIoGlPzX57izHEw3AxaCWRWz9L156asliR24taKwOLBwPUcLUPyD/Np+Uf V9cGe8b61lK/UM3ad77v4GpmeaxFdXMfViR0NJ4GyD4podWohc73qliIAJSPa9qfG1pz A2Sg== X-Gm-Message-State: APjAAAXDbF0a2AY80ri7yysFV2/pXIox38ARpEu4nrJFqN+fbm8Xjhf3 Gak46IvkI1q4ZobCCxCA0yC7a02mndx7TRl9FsLmJT0wD/oBWjHZYAIiKfnsglVphEbcUY9Bv0m 5iXf3uA+c85x6tug+EEv371j/rKzbv9CQRs4XNLS/0WE9qpqDjegsE1YNja+H4XC6iQ== X-Received: by 2002:a63:ef53:: with SMTP id c19mr32990059pgk.120.1557762396664; Mon, 13 May 2019 08:46:36 -0700 (PDT) X-Google-Smtp-Source: APXvYqxkgDzRumeKEyDV+NIe+F8FwDj5e7zTeD5vZnDg/sTFEcaXvA/rPe8JywABGiifEAfJF2bq X-Received: by 2002:a63:ef53:: with SMTP id c19mr32989985pgk.120.1557762396048; Mon, 13 May 2019 08:46:36 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1557762396; cv=none; d=google.com; s=arc-20160816; b=jBzVLIBnYmADqJMPqjB/ocp6tsHD73/M0LyOeFwPBlYp7Nxeo8bdXJ8w5XONbVamJF X2rBbC9napOTtcV8oXh5re7URrrmW20jCh5fNxHPQLhrziZ37ifSnzdlBB5XN8GShYWi flSLucYJQSsypj59E+GWR0Yml4vy9/S/YqDtn+tZxXMcNpqMYS+8SRNVe5iL5POZwnrc SfStawyYRqG8kXtMLq6r/a2KRuioWGsqKc0XCAF9dUBnwUkQaRMFmc25Y9WC7e/mnGpk 8ce4QOvZufy1HkBWlRDKZ3U8HTiYzsmm4mxU8oRNxTUqk8ptTi2W+7w5h+4pOdq50o4G 5ilg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:dkim-signature; bh=CX+WwNrHxbi6+vKJH849ujFTw6wRLqJatbYNgyEeksI=; b=DD2nlDBpJ5P55wmh8wmqwcjyeA+xFUgkI+WewpmlfYIWj/fhZ3HL7RzWIb3yhQ5ii4 /sXqEJoAnC+KQx9kTEalIzUgc8d4w9kgpO+91sJvF3t1a3oSjp2Xgg/zF29pVsxzTDe4 qytS8uRshXjxVy6BqB63m37co9tIfqPtTMGqATy10vqAKMyFX1GqjXRZ+T+g98nd/M44 ATjsr0E7A68gbllrnVAMaS71qU9KHa+9aG7fdSZB5Y5/fpFKnOCJm0ZHjSkNv/RpcwxT Cw4fJ9SgFdVf4HQSFJd/vw+EnvbJzZ1yyytMmIn4CqFgt7L1+itRe0lqyrKALvRdCt59 WHYw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=mImlR6Is; spf=pass (google.com: domain of luto@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=luto@kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from mail.kernel.org (mail.kernel.org. [198.145.29.99]) by mx.google.com with ESMTPS id r127si18525303pfr.78.2019.05.13.08.46.35 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 13 May 2019 08:46:36 -0700 (PDT) Received-SPF: pass (google.com: domain of luto@kernel.org designates 198.145.29.99 as permitted sender) client-ip=198.145.29.99; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=mImlR6Is; spf=pass (google.com: domain of luto@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=luto@kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from mail-wm1-f50.google.com (mail-wm1-f50.google.com [209.85.128.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 76D8721473 for ; Mon, 13 May 2019 15:46:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557762395; bh=OcS05eqt08syOJc9XJ+Dq4To3jKF7QcT29fpWx88obU=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=mImlR6Is3TMf8fni+IDHdVAZsE7/1M0GTnfOaMuLRGfn1j1/BDu3RGxid6M+0vEiu TFTwQ6jlT+YHrBRxipQ8awjHA/fJy38yEvFDnls8nlN4k82xHuQ7q8V28aXBH0UBQe sppUfQgNAihbuliOSVH+T+E061V8MR3QzVezRa2w= Received: by mail-wm1-f50.google.com with SMTP id j187so14224316wmj.1 for ; Mon, 13 May 2019 08:46:35 -0700 (PDT) X-Received: by 2002:a1c:eb18:: with SMTP id j24mr16973110wmh.32.1557762394127; Mon, 13 May 2019 08:46:34 -0700 (PDT) MIME-Version: 1.0 References: <1557758315-12667-1-git-send-email-alexandre.chartre@oracle.com> <1557758315-12667-3-git-send-email-alexandre.chartre@oracle.com> In-Reply-To: <1557758315-12667-3-git-send-email-alexandre.chartre@oracle.com> From: Andy Lutomirski Date: Mon, 13 May 2019 08:46:22 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [RFC KVM 02/27] KVM: x86: Introduce address_space_isolation module parameter To: Alexandre Chartre Cc: Paolo Bonzini , Radim Krcmar , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Dave Hansen , Andrew Lutomirski , Peter Zijlstra , kvm list , X86 ML , Linux-MM , LKML , Konrad Rzeszutek Wilk , jan.setjeeilers@oracle.com, Liran Alon , Jonathan Adams Content-Type: text/plain; charset="UTF-8" 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 Mon, May 13, 2019 at 7:39 AM Alexandre Chartre wrote: > > From: Liran Alon > > Add the address_space_isolation parameter to the kvm module. > > When set to true, KVM #VMExit handlers run in isolated address space > which maps only KVM required code and per-VM information instead of > entire kernel address space. Does the *entry* also get isolated? If not, it seems less useful for side-channel mitigation.