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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 18BEAC1975A for ; Thu, 12 Mar 2020 15:00:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DD636206E7 for ; Thu, 12 Mar 2020 15:00:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="BC+cOO8H" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727695AbgCLPAr (ORCPT ); Thu, 12 Mar 2020 11:00:47 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:32194 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727363AbgCLPAr (ORCPT ); Thu, 12 Mar 2020 11:00:47 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1584025246; 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; bh=RPWm8AwSfw0eG4OBrSTSKA0oa/UVpusYPjdmHiVrCJg=; b=BC+cOO8H8Ms8i2GNH7LYmcPiGdG5BXtqqn/MHJnK0vcPKy5MaPR3qyIlD7dk4/1e6qPDcU DSO2eGX/PCjZ6YQuIf205MwDTPtuRcjZ5JUSASo1YNbeJVSGhtjo8I2SZWMVw0pAIiLyCA Xf0nN7QAu9tmhPQxv7iOtOwykMFUBRg= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-47-XYs-1S40MqaetYIICw6mQg-1; Thu, 12 Mar 2020 11:00:44 -0400 X-MC-Unique: XYs-1S40MqaetYIICw6mQg-1 Received: by mail-wm1-f70.google.com with SMTP id s15so401302wmc.0 for ; Thu, 12 Mar 2020 08:00:44 -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:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=RPWm8AwSfw0eG4OBrSTSKA0oa/UVpusYPjdmHiVrCJg=; b=OPUq9dgOZnkN66SmglLbGFck55BNkCdMkdWmR8oB4e0FOugUZu97dup14ub6ezTPDN QTomkNYrf/RYNIveu2rC13HmTC0Ps8wA3rL4VCtnvZa3QGkWrO3gdxrS4GfoAqfrc4Vo i11fgUEbZE2PKE7ntAL3zMh8E4AxUba3gt2MHHSvuRGrRetkCFp1dLu2pZBHrO4Dschj o2PsaWkRc1glgQpiiyH3Frmf3lZFutMVOwGEweNrYS25ZrESoi6WYFWxL6IkCywBqWf5 77XcL0SSIgbJWE4ilR1/K8tmTH63V1dPcNu+eL7o/9SNbDFKTGAiBOoUc0jOpYfR6yp0 2xWA== X-Gm-Message-State: ANhLgQ0hFmIehn9k3W0S+PJeQTFlO/BOzVUNismic1XPkNBXDelfxfOi zy+SsPbJflSFlfGbajM3qLhTcIpoZfr7MNPggFXa4Fbb+eRCwVjFTKkvtah41T08TAZ/5o/HxAk YF+JzqsA23vq6amehOizK8i6e X-Received: by 2002:a7b:c20c:: with SMTP id x12mr5369828wmi.80.1584025243668; Thu, 12 Mar 2020 08:00:43 -0700 (PDT) X-Google-Smtp-Source: ADFU+vv+tC2jQZowB2YfPlneEyVZ/xYyDnKqGw1zH6qmMf7afBiGb0FLNqPOcXVBu1mFXjAlzCi/5w== X-Received: by 2002:a7b:c20c:: with SMTP id x12mr5369808wmi.80.1584025243455; Thu, 12 Mar 2020 08:00:43 -0700 (PDT) Received: from [192.168.178.58] ([151.21.173.186]) by smtp.gmail.com with ESMTPSA id u204sm10177541wmg.40.2020.03.12.08.00.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 Mar 2020 08:00:42 -0700 (PDT) Subject: Re: [PATCH v2 3/6] kvm: x86: Emulate split-lock access as a write To: Xiaoyao Li , Sean Christopherson Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Andy Lutomirski , x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, David Laight References: <20200203151608.28053-1-xiaoyao.li@intel.com> <20200203151608.28053-4-xiaoyao.li@intel.com> <95d29a81-62d5-f5b6-0eb6-9d002c0bba23@redhat.com> <878sl945tj.fsf@nanos.tec.linutronix.de> <20200227001117.GX9940@linux.intel.com> <18333d32-9ec4-4aee-8c58-b2f44bb8e83d@intel.com> From: Paolo Bonzini Message-ID: Date: Thu, 12 Mar 2020 16:00:40 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <18333d32-9ec4-4aee-8c58-b2f44bb8e83d@intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/03/20 12:42, Xiaoyao Li wrote: >> I completely agree that poorly emulating the instruction from the >> (likely) malicious guest is a hack, but it's a simple and easy to >> maintain hack. > > What's your opinion about above? That's okay, I suppose. Paolo