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 29360C00454 for ; Thu, 12 Dec 2019 15:57:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E9AB82465E for ; Thu, 12 Dec 2019 15:57:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="I/1D3Ney" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729507AbfLLP5T (ORCPT ); Thu, 12 Dec 2019 10:57:19 -0500 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:40167 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729499AbfLLP5T (ORCPT ); Thu, 12 Dec 2019 10:57:19 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576166237; 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=rRNrufMF5ZmcT+/5HZMlWib9qPtBnpXc+naU09rmhxc=; b=I/1D3NeyxiyZlMNbK4bu4WwA5RQCzhKoRFQo8VNt3mEFce0g//irADh5p+53pDACxO2wIy NMgItXamgQAxJuD8tZ1r/rL9RN+1xBW8xioK2s1u7fgyoFYP6xvAk4Nu7uEUnkJWShBAJw N0zHG8T4c4sf6JA0bGDl4jWpGJhcOr4= 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-182-AqEm4mHUO6uiGdHf8Vn-fQ-1; Thu, 12 Dec 2019 10:57:16 -0500 X-MC-Unique: AqEm4mHUO6uiGdHf8Vn-fQ-1 Received: by mail-wm1-f70.google.com with SMTP id b131so1018553wmd.9 for ; Thu, 12 Dec 2019 07:57:16 -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=rRNrufMF5ZmcT+/5HZMlWib9qPtBnpXc+naU09rmhxc=; b=TNrDarrbzUeadzRSTVKS3E14HSAK7aYVa1yekmlqEVdVxfiuz/lcXJHiuhGBMGKRa8 NxO9lGoIsB5vvG91YrWfolCoI+yIM7/ugfmDjHe2+GH4BtQ+RFJCjaAVJxK9vo7rwJ3o vn5rVAczVrAMfIWhBRjzrLpIoRpb+G24lvjPGlPVIoREsdoT21t2UWLpszo3gBUrL819 OF+OEH83TTLJ8Hm8X3iOqqa3vgk5n4BjxlVfyHzTqTxuFFIA3++GPhpvczXxXYh5sFOf RML4l2IVdBbHWtlYVa237W48p1JGOYBmVVvhk0zGDW/OaiuPsq44G1Pr0GWQVTf3EzX8 7Q3Q== X-Gm-Message-State: APjAAAX6QAtZbbzDblAaYmyf+jW6afpFaT+uCcK25u1Ah8yWghjzsTcW BUklQNYc7hdnE3O1J84xHp95r/Genh6N5yTWV9sVtyrg/dNQXNCLmGbMqej70Njvm9GXrR4Nz9B Nl3drdcAHMpMB1dWZla/EB61azJiJ X-Received: by 2002:adf:e6c6:: with SMTP id y6mr7226950wrm.284.1576166235414; Thu, 12 Dec 2019 07:57:15 -0800 (PST) X-Google-Smtp-Source: APXvYqxCcJblbdBpu6fVRmTMMxd9YCps91vlO3a/KrWqDMJ5D1GjIwC7bcnVpKVuMe+qGktQ2LnvbA== X-Received: by 2002:adf:e6c6:: with SMTP id y6mr7226922wrm.284.1576166235182; Thu, 12 Dec 2019 07:57:15 -0800 (PST) Received: from ?IPv6:2001:b07:6468:f312:e9bb:92e9:fcc3:7ba9? ([2001:b07:6468:f312:e9bb:92e9:fcc3:7ba9]) by smtp.gmail.com with ESMTPSA id s10sm6451431wrw.12.2019.12.12.07.57.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 12 Dec 2019 07:57:14 -0800 (PST) Subject: Re: [PATCH v4 11/19] x86/cpu: Print VMX flags in /proc/cpuinfo using VMX_FEATURES_* To: Liran Alon Cc: Borislav Petkov , Sean Christopherson , Thomas Gleixner , Ingo Molnar , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , Arnaldo Carvalho de Melo , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Tony Luck , Tony W Wang-oc , Len Brown , Shuah Khan , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-edac@vger.kernel.org, linux-pm@vger.kernel.org, linux-kselftest@vger.kernel.org, Jarkko Sakkinen References: <20191128014016.4389-1-sean.j.christopherson@intel.com> <20191128014016.4389-12-sean.j.christopherson@intel.com> <20191212122646.GE4991@zn.tnic> <4A24DE75-4E68-4EC6-B3F3-4ACB0EE82BF0@oracle.com> From: Paolo Bonzini Message-ID: <17c6569e-d0af-539c-6d63-f4c07367d8d1@redhat.com> Date: Thu, 12 Dec 2019 16:57:10 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <4A24DE75-4E68-4EC6-B3F3-4ACB0EE82BF0@oracle.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org On 12/12/19 16:52, Liran Alon wrote: >>> virt_apic_accesses -> vapic >> apicv > Frankly, I dislike APICv terminology. I prefer to enumerate the > various VMX features which are collectively called APICv by KVM. > APICv currently represents in KVM terminology the combination of > APIC-register virtualization, virtual-interrupt-delivery and > posted-interrupts (See cpu_has_vmx_apicv()). > > In fact, the coupling of “enable_apicv” module parameter have made me > multiple times to need to disable entire APICv features when there > for example was only a bug in posted-interrupts. > > Even you got confused as virtualize-apic-access is not part of KVM’s > APICv terminology but rather it’s enablement depend on > flexpriority_enabled (See cpu_need_virtualize_apic_accesses()). i.e. > It can be used for faster intercept handling of accesses to guest > xAPIC MMIO page. Right, I got confused with APIC-register virtualization. Virtualize APIC accesses is another one I wouldn't bother putting in /proc/cpuinfo, since it's usually present together with flexpriority. Paolo