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 DE651C3F2C6 for ; Tue, 3 Mar 2020 15:40:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AEA6620828 for ; Tue, 3 Mar 2020 15:40:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ake5qf4i" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730050AbgCCPki (ORCPT ); Tue, 3 Mar 2020 10:40:38 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:37366 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727079AbgCCPki (ORCPT ); Tue, 3 Mar 2020 10:40:38 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583250037; 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=SrF8JSKjOdBJZVRt/AXRACdTMcBXv4bNXWLtdukx5fQ=; b=ake5qf4iJ5jxHmd1J7hRGtVEzIDn6XA0+wLFNCyeYBMbU4WYWBmhmSAyzDRV6MJuzDm0Im ExpCDkj0Lo5ecEfYAUmQn5HCNREQz65B6Yl2C8u0z/mcQqwVAe/s/w+AQjvVnxAZG/52OM MaYgzisT1/VVXA4SGeLEJ9YUchoa/W4= Received: from mail-wr1-f71.google.com (mail-wr1-f71.google.com [209.85.221.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-289-0R4BpxVwN7yklL9ZTu8A_w-1; Tue, 03 Mar 2020 10:40:36 -0500 X-MC-Unique: 0R4BpxVwN7yklL9ZTu8A_w-1 Received: by mail-wr1-f71.google.com with SMTP id p5so1369940wrj.17 for ; Tue, 03 Mar 2020 07:40:35 -0800 (PST) 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=SrF8JSKjOdBJZVRt/AXRACdTMcBXv4bNXWLtdukx5fQ=; b=cZZWoa3Xb5mcZXwYecVcBl187p7jMICtayeX7UFlIJpydy5FiOn/Ki2P84R03huvcA j3LK6h2Xv16Cq+oNTMi23lwrgvS3WITz6twXkhkzLykshF21/IXI2UGNPZlAOoy8URPN ajWI2Oeg29M21FKE508TkGN0G+3Wp/kpgw50f6osrc0rFAOi6NQeZ1/nIdUYF2YNr71r XeF2Kw1/2APgX+qMaH+aQknJurHuScBxPjmAxCoteF78bpeRuhMRK5qfcUpiJqOE2+0Q AxjcgDHBeC0zjLpw5QLfUBGpcEhBGLygIicxaLr90JaAQAIEd4MH7Mzim6A6dvO1iV2b Qf8w== X-Gm-Message-State: ANhLgQ1fKmFKHAPnJgHnnUrxRRR67qACjF6DiEIieYqKzRTLyfWPbB/4 EvIHxFf/8zfD+7bsV/KSCzf5+sRv1NUv++iLik0Dd2PL9A3H15Qpu2ne9klay3KPkjult651lDs 3+E54LkJtnGpd3bNvbA0nbQJG X-Received: by 2002:a7b:c446:: with SMTP id l6mr4718638wmi.94.1583250034918; Tue, 03 Mar 2020 07:40:34 -0800 (PST) X-Google-Smtp-Source: ADFU+vsIy7f/SKdW2QFW2LYYoV1RsOjaZ70eCj2/ll6a/OC6f6S6aofvunS899Akpq0Wiy7IoguI/Q== X-Received: by 2002:a7b:c446:: with SMTP id l6mr4718619wmi.94.1583250034726; Tue, 03 Mar 2020 07:40:34 -0800 (PST) Received: from [192.168.178.40] ([151.20.254.94]) by smtp.gmail.com with ESMTPSA id z10sm4378147wmk.31.2020.03.03.07.40.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Mar 2020 07:40:34 -0800 (PST) Subject: Re: [PATCH v2 36/66] KVM: x86: Handle GBPAGE CPUID adjustment for EPT in VMX code To: Sean Christopherson Cc: Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Xiaoyao Li References: <20200302235709.27467-1-sean.j.christopherson@intel.com> <20200302235709.27467-37-sean.j.christopherson@intel.com> <90df7276-e586-9082-3d80-6b45e0fb4670@redhat.com> <20200303153550.GC1439@linux.intel.com> From: Paolo Bonzini Message-ID: Date: Tue, 3 Mar 2020 16:40:32 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <20200303153550.GC1439@linux.intel.com> Content-Type: text/plain; charset=windows-1252 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 03/03/20 16:35, Sean Christopherson wrote: > Oof, that took me a long time to process. You're saying that KVM can > allow the guest to use GBPAGES when shadow paging is enabled because KVM > can effectively emulate GBPAGES. And IIUC, you're also saying that > cpuid.GBPAGES should never be influenced by EPT restrictions. > > That all makes sense. Yes, exactly. Paolo