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=-8.0 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 6F62AC4338F for ; Tue, 10 Aug 2021 12:47:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 544E060EFF for ; Tue, 10 Aug 2021 12:47:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240812AbhHJMr4 (ORCPT ); Tue, 10 Aug 2021 08:47:56 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:40524 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240806AbhHJMrz (ORCPT ); Tue, 10 Aug 2021 08:47:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1628599653; 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=A1vbqk+HrMkFDgZmPhDLQJTDofCmdnOiLqBGa7TgNLo=; b=SDi3tTsdzmae2br0GzMxV2HIx3KgBiWwWu1V+ZS3ZhHiX94qKnA86i0+ucNNu44hGCif+a FUy3GGDXR/M0Ps6H8UZfpNr7ZwtaO896gQ6d2jw0luWkdFAMDAcikacTFSdWVGdhLF23eO ygiqiGb/JeE31CZhxt+q7MhxwhMXrmk= Received: from mail-ej1-f71.google.com (mail-ej1-f71.google.com [209.85.218.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-119-30g0KS7HNfyK2q9LVNtT-A-1; Tue, 10 Aug 2021 08:47:31 -0400 X-MC-Unique: 30g0KS7HNfyK2q9LVNtT-A-1 Received: by mail-ej1-f71.google.com with SMTP id k12-20020a170906680cb02905aeccdbd1efso1894382ejr.9 for ; Tue, 10 Aug 2021 05:47:31 -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=A1vbqk+HrMkFDgZmPhDLQJTDofCmdnOiLqBGa7TgNLo=; b=Tuwbiz5NqK1ilEczPtyY5ocw3KV1JnvOgz6jmxSmaxyLTr/sM9Bkl5Z/TLPBFaFftH 0jrGrK4Zv/su3WqBs+0/qOcoauvlL8w8b7Dmwyv0iSzxDcSlSov/ifXVXsPiDoptJ/CA HVj+ZI93rpYiF14I/XOdHuQRbC/S9c5lh+dSTe0nJGTbNBLaHzS23NGX+k62pa9NUJ8Z cNte0b1xu9V3t3SYhQQr0yIeO0I/MzzfJNr2gyexL60OOGYcCz11MuTdi6GZi0grZjas kW5ORcfqBGGn8yJWDpTB4Ek5AdhV01jloHnn+m9/9N4CIa3ppImvbF1Y8UwdTnW+g3GE Bu6Q== X-Gm-Message-State: AOAM530uCy84nrA5be5Hd8cbyh0UvL3JN/tufaRIBNYccpgAc4aAgoLK +croOYl3kaq0FneDIXtOaSd8/NKKUm1QcHmgSiYQ9uHJF38j5CKn2H0eaJt7VkON79cIJE8zVc2 2g8nwvIhCeeiy X-Received: by 2002:a17:907:1b22:: with SMTP id mp34mr1181771ejc.408.1628599650600; Tue, 10 Aug 2021 05:47:30 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyE8QW/f8zbOv6QQNcq3X7xQP29i0UFEQ6RYzZJQFLRWZLXKX5NRRV05HIud8CMBLdXPoqZnQ== X-Received: by 2002:a17:907:1b22:: with SMTP id mp34mr1181758ejc.408.1628599650409; Tue, 10 Aug 2021 05:47:30 -0700 (PDT) Received: from [192.168.10.118] ([93.56.169.140]) by smtp.gmail.com with ESMTPSA id df14sm9536725edb.90.2021.08.10.05.47.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Aug 2021 05:47:29 -0700 (PDT) Subject: Re: [PATCH v2 1/3] KVM: x86: Allow CPU to force vendor-specific TDP level To: Yu Zhang Cc: Sean Christopherson , Wei Huang , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com References: <20210808192658.2923641-1-wei.huang2@amd.com> <20210808192658.2923641-2-wei.huang2@amd.com> <20210809035806.5cqdqm5vkexvngda@linux.intel.com> <20210809042703.25gfuuvujicc3vj7@linux.intel.com> <73bbaac0-701c-42dd-36da-aae1fed7f1a0@amd.com> <20210809064224.ctu3zxknn7s56gk3@linux.intel.com> <20210810074037.mizpggevgyhed6rm@linux.intel.com> <0ac41a07-beeb-161e-9e5d-e45477106c01@redhat.com> <20210810110031.h7vaqf3nljwm3wym@linux.intel.com> From: Paolo Bonzini Message-ID: <998dca9a-84b6-20ee-2646-3eb58df0b8a0@redhat.com> Date: Tue, 10 Aug 2021 14:47:27 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210810110031.h7vaqf3nljwm3wym@linux.intel.com> 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 10/08/21 13:00, Yu Zhang wrote: > I guess it's because, unlike EPT which are with either 4 or 5 levels, NPT's > level can range from 2 to 5, depending on the host paging mode... Yes, on Linux that will be one of 3/4/5 based on host paging mode, and it will apply to all N_CR3... > But shadow EPT does not have such annoyance. Is above understanding correct? ... Right, because shadow EPT cannot have less than 4 levels, and it can always use 4 levels if that's what L1 uses. Paolo