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=-7.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,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 8F734C48BC2 for ; Wed, 23 Jun 2021 21:38:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 69512611AC for ; Wed, 23 Jun 2021 21:38:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229882AbhFWVkb (ORCPT ); Wed, 23 Jun 2021 17:40:31 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:59971 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229916AbhFWVk1 (ORCPT ); Wed, 23 Jun 2021 17:40:27 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1624484289; 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=gG8pmP7c81qoKNPdPYRVSdzxqstcUMu8cOiYQJMyV4s=; b=DhuGebSkadNrvQzjBqKNpfjR1FIvioGWyWy+6CWKI0JIaqRvS+1fCsA4C7jk46jkInU8/g UtlTBb74CF6ikDabY+uL+76ghsT5gMOdVNG0y2bUsEZ1fBx7a0fegeMruH/eiZnjFrk8Hh BYoWWauBDoUZaWbbyQOckEhg9Wx2i8c= Received: from mail-ed1-f70.google.com (mail-ed1-f70.google.com [209.85.208.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-368-mtSfKeMoNemIJgwt6dVD1A-1; Wed, 23 Jun 2021 17:37:56 -0400 X-MC-Unique: mtSfKeMoNemIJgwt6dVD1A-1 Received: by mail-ed1-f70.google.com with SMTP id i19-20020a05640200d3b02903948b71f25cso2066749edu.4 for ; Wed, 23 Jun 2021 14:37:56 -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=gG8pmP7c81qoKNPdPYRVSdzxqstcUMu8cOiYQJMyV4s=; b=iqhsYa02nC5UYF/HT6RJie//glyT/lFL3RCN5LNjGJYTExM6Z6Clb48lnDf9ryV2WZ OQ4zcbdn3SBTyJDiT7o8l/nfoUTl7x3nNKsRcvRlwUoIfO6Td67Qs2wDAz1qAJ+w/8ch XpVe6kXjTrD4prd3Oe9AGhMgBOCLhYgKk5Rq4IUhIibWKckkmWJQkxBgyeR8hY63XEJI 1/LGeXZ26NlNGeTmmwPVE+2MlHuMIxDjRIGFdIiuqm/YoaW39k3225dyYmCC4lFHltBl ghdcW4jJKuUDvbgAlX6+qpe0vteUfllaT3m9rYZelGYAhioYMb1rn3x7BJkaXO4Rakcm PBvg== X-Gm-Message-State: AOAM530A+4qo3I89RaxRdXzZVtrgH7MmxiP4UstW4HBy9Iv0AcScZDhn 4bolMcJAerJs7ESkYRgEbcNtqJtCPRtRNXMuJ1tgZVI46pzC1/39CvQWgCB+9JOpx4NaQpQVEk6 LzqkBCqQq1G0t X-Received: by 2002:a17:906:af08:: with SMTP id lx8mr2029027ejb.317.1624484275157; Wed, 23 Jun 2021 14:37:55 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwXu4Y3JMrg8H2lJ5+GgCIcDFSqnITYCY8a/4wxS8A/SuIJApba7ICr8gc042wefCqh7r+EoQ== X-Received: by 2002:a17:906:af08:: with SMTP id lx8mr2029018ejb.317.1624484275019; Wed, 23 Jun 2021 14:37:55 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:c8dd:75d4:99ab:290a? ([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id my16sm365157ejc.50.2021.06.23.14.37.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 23 Jun 2021 14:37:54 -0700 (PDT) Subject: Re: [PATCH] kvm: x86: disable the narrow guest module parameter on unload To: Jim Mattson , Aaron Lewis Cc: kvm@vger.kernel.org, mgamal@redhat.com References: <20210623203426.1891402-1-aaronlewis@google.com> From: Paolo Bonzini Message-ID: <0aa3a8bd-b9c9-c773-bc2b-e9b1c7f2660f@redhat.com> Date: Wed, 23 Jun 2021 23:37:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 23/06/21 22:47, Jim Mattson wrote: > This seems reasonable to me. Another option is to move the backing > variable to the kvm_intel module, given the recent suggestion that it > should never be enabled for AMD. Why wouldn't it be enabled for shadow paging, since the issue with AMD is specific to the ordering of nested vs. guest page faults? Paolo