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=-2.2 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 DD68CC7618F for ; Tue, 16 Jul 2019 20:13:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AAD7B20659 for ; Tue, 16 Jul 2019 20:13:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728781AbfGPUNF (ORCPT ); Tue, 16 Jul 2019 16:13:05 -0400 Received: from mail-wr1-f67.google.com ([209.85.221.67]:37573 "EHLO mail-wr1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728535AbfGPUNF (ORCPT ); Tue, 16 Jul 2019 16:13:05 -0400 Received: by mail-wr1-f67.google.com with SMTP id n9so22301532wrr.4 for ; Tue, 16 Jul 2019 13:13:04 -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=Fdtaa5Mk+vn+zBbJ4ERXB6fzzU4M4WV7ztEIjLq36Mc=; b=sGYzfo0rQVFBwNpvR3OdH7/OoRM0K2159C+5qkCGDDgKjF94Wu5DxUd9/ZxVblRrBp oXfLUcaIJ3YG9PE+z8YqDgzi58cVSgNidcC7MxQULjMqnm21u68vXWSrFwBGS8yAYy8D fkIf1JuLM8yXV7sNeQ8Rhcn7qTysOpBq0JikK9ZSm/aa34sAkDV4VqF621uo6g8Iivnp w1G3q4Re4LoSSZehhVRoZcAY4klL12de25FIDIihZ1IFVWim4Dvy0DT7zT/A/RegwPtf MXRu9qZyGirK5QoO/iOeDQ25qrj4ZQrJZbifkb/pWukj3ynFFAPpDHDP/81SAn8WXNIG vLnA== X-Gm-Message-State: APjAAAV8blO5JrQgEowMKJd+6y1oL1huvluyejGQ0b3GhIXu2ZLAk4hb LjPiAGcKg1CT+sr3f/KOGh44OQ== X-Google-Smtp-Source: APXvYqx+Ge7F0Er38BlXtV7V8UVjxIF3JQzeQ10j2+WKx4MIkkn44KC5rsvaDP4+nSV0PWDNSenXcw== X-Received: by 2002:adf:df90:: with SMTP id z16mr7602770wrl.331.1563307983455; Tue, 16 Jul 2019 13:13:03 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:b159:8d52:3041:ae0d? ([2001:b07:6468:f312:b159:8d52:3041:ae0d]) by smtp.gmail.com with ESMTPSA id 18sm21224557wmg.43.2019.07.16.13.13.02 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Tue, 16 Jul 2019 13:13:02 -0700 (PDT) Subject: Re: [PATCH 1/2] KVM: SVM: Fix workaround for AMD Errata 1096 To: Sean Christopherson , "Singh, Brijesh" Cc: Liran Alon , "rkrcmar@redhat.com" , "kvm@vger.kernel.org" , Boris Ostrovsky References: <20190716164151.GC1987@linux.intel.com> <60D01C4B-EC2E-453E-B5F6-BBE8FA94E31D@oracle.com> <015b03bc-8518-2066-c916-f5e12dd2d506@amd.com> <174F27B9-2C6B-4B9F-8091-56FA85B32BB2@oracle.com> <31926848-2cf3-caca-335d-5f3e32a25cd3@amd.com> <20190716200749.GC28096@linux.intel.com> From: Paolo Bonzini Openpgp: preference=signencrypt Message-ID: Date: Tue, 16 Jul 2019 22:13:00 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190716200749.GC28096@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 16/07/19 22:07, Sean Christopherson wrote: >> We are discussing reserved NPF so we need to be at CPL3. > For my own education, why does reserved NPF require CPL3? I.e. what > happens if a reserved bit is encountered at CPL<3 (or do they simply not > exist)? Better: what happens if a reserved bit is encountered at CPL<3 *with CR4.SMEP=0*? Paolo