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=-5.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 B7377C47404 for ; Fri, 4 Oct 2019 07:27:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8F0BD21D81 for ; Fri, 4 Oct 2019 07:27:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="IsIt9NAQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729970AbfJDH1P (ORCPT ); Fri, 4 Oct 2019 03:27:15 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:23847 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728140AbfJDH1P (ORCPT ); Fri, 4 Oct 2019 03:27:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1570174033; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:openpgp:openpgp; bh=XUCVhLyFU0egbeCCPyi0gdOMvXkRkhtQ2UQBx6VdaxY=; b=IsIt9NAQW1emN3o31/e9G7Q0L6ElHcLkNQNEF43Buh4YusBLfeIinADVCsYky2Ck6vWrNR ZTcG2DeNLY5dMiFZpeTJ5p0hdOG/2mi9e8Yj3dG+zNlMFhWvJawz02D2ZXnd0y5BlgcD++ oCHWc6SQ5shLa4NDXwhJlyoqnE69YgU= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-315-NASgcO42MiizJ9YAxGiNPQ-1; Fri, 04 Oct 2019 03:27:12 -0400 Received: by mail-wr1-f72.google.com with SMTP id w8so2313491wrm.3 for ; Fri, 04 Oct 2019 00:27:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:openpgp:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=aEdY8z5AWfJTa7GTLm63bwyTFqdMFQ7x24M2Gp/SY3g=; b=TVdNxzB/LooUzb+RsLONiZmE78TZW+R6GvHB+CSh73A6a8ZGkkqD2Cr39ALO83VaF3 FB/DIlLqGad4UjsWIEA14NrjU6QjZtMzK7xJC+uNAwBE8YBlDgALPK/MqEuOh0pRD+fG TffWuehDpKrQeBnb7PvZyi7222IPqt4/eBxK+Wf615a50SEO8FE7ae835JRXjNuNNiDW EBX+pYNzQTjRWExcceNl0WZNYTMGy2pasJUAPzvdK1mmTA8pKlRdgBLhr4JJ7dmIqHss yRMA/qEYbSaJkJP5n3XESc5R51lySCFIb1ZWFxrK5mDZHHG2CW7y/b1mFjrsAmOZ7HnE vDrw== X-Gm-Message-State: APjAAAVrRFakX0bep2lHfLcH1FuDymHNmUkFQm4vgWOm91xUfgEpFpCO AUfw/4axhCFLXeHhfIGyu44oij1z2pC9b4mKMeVnpgCjMPbR6q5780bkMQ5yo3kufu5BmzxsWgG wS5MTLUZg3MtQ X-Received: by 2002:adf:ef4a:: with SMTP id c10mr1474582wrp.10.1570174030808; Fri, 04 Oct 2019 00:27:10 -0700 (PDT) X-Google-Smtp-Source: APXvYqwVRPZN9h/0C4acuqjoYLiCq8cberKuvezxJ5ZluiUcxk7RleMGP3eYODMaMTDsSPJdw/GkUg== X-Received: by 2002:adf:ef4a:: with SMTP id c10mr1474556wrp.10.1570174030564; Fri, 04 Oct 2019 00:27:10 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:e56d:fbdf:8b79:c79c? ([2001:b07:6468:f312:e56d:fbdf:8b79:c79c]) by smtp.gmail.com with ESMTPSA id m16sm3817660wml.11.2019.10.04.00.27.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 04 Oct 2019 00:27:09 -0700 (PDT) Subject: Re: [RFC PATCH 03/13] kvm: Add XO memslot type To: Rick Edgecombe , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, luto@kernel.org, peterz@infradead.org, dave.hansen@intel.com, sean.j.christopherson@intel.com, keescook@chromium.org Cc: kristen@linux.intel.com, deneen.t.dock@intel.com, Yu Zhang References: <20191003212400.31130-1-rick.p.edgecombe@intel.com> <20191003212400.31130-4-rick.p.edgecombe@intel.com> From: Paolo Bonzini Openpgp: preference=signencrypt Message-ID: <5201724e-bded-1af1-7f46-0f3e1763c797@redhat.com> Date: Fri, 4 Oct 2019 09:27:09 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20191003212400.31130-4-rick.p.edgecombe@intel.com> Content-Language: en-US X-MC-Unique: NASgcO42MiizJ9YAxGiNPQ-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 03/10/19 23:23, Rick Edgecombe wrote: > Add XO memslot type to create execute-only guest physical memory based on > the RO memslot. Like the RO memslot, disallow changing the memslot type > to/from XO. >=20 > In the EPT case ACC_USER_MASK represents the readable bit, so add the > ability for set_spte() to unset this. >=20 > This is based in part on a patch by Yu Zhang. >=20 > Signed-off-by: Yu Zhang > Signed-off-by: Rick Edgecombe Instead of this, why not check the exit qualification gpa and, if it has the XO bit set, mask away both the XO bit and the R bit? It can be done unconditionally for all memslots. This should require no change to userspace. Paolo