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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3B4BC433EF for ; Mon, 18 Oct 2021 15:21:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B93E760ED4 for ; Mon, 18 Oct 2021 15:21:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232740AbhJRPXH (ORCPT ); Mon, 18 Oct 2021 11:23:07 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:20700 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232303AbhJRPXE (ORCPT ); Mon, 18 Oct 2021 11:23:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1634570452; 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=weGzz/RU3tcYXCDKayytqHwl63UjBOGSEo1p1tbZCGw=; b=VbbEvpCD5d2Xx0XsKJ7xF9WF7kd5JITxQ4vQWSEcoGZSuXWHLWSg0gh21BBBu+CBzkxGEC BCqFNXQVbjhR/zwyPAPcH40X+v+4w1PirQhorxAOh0EgO2CaSnsP4wFcPKlVNnMYEiYTUZ WYmgoC2bXIRYylIKvN4Hwm8HghwBZGQ= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-560-63efWY8jOeK7JOKWw3-rWA-1; Mon, 18 Oct 2021 11:20:51 -0400 X-MC-Unique: 63efWY8jOeK7JOKWw3-rWA-1 Received: by mail-wr1-f69.google.com with SMTP id j19-20020adfb313000000b00160a9de13b3so8968476wrd.8 for ; Mon, 18 Oct 2021 08:20:51 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=weGzz/RU3tcYXCDKayytqHwl63UjBOGSEo1p1tbZCGw=; b=X6WWRIn7xBFObQJPyVA7rymPahBuks+3QVfSX33yA3ALySTORNnDgsPIFhrEcqzqGF Nytm64hx8tWmLMFsp6P2iNr4tS/OeW4HyrhvkpDWTWYx8DE/godvV7k5QWH/Xm+VJIDs SlnBMkN0h71v+i+DlYyYHyGLsyhOaaWU1w2PBbcx/PZW9w/mh3sSaHeR921Kw9U5k96+ Iess9V8CqGoqc/wlBNVmgKIX9SkYJt+er3Gw2GtBJuEIM9pCFzBvvdxv60DFowH1qawL BaujW+Gd4UWZ4LESFLyicwuI9KmC+Pt5qoisCeAffKjjo5YSodtlaJgW4GP3KA48BRSC Ko1Q== X-Gm-Message-State: AOAM533V76E9JgjLEMzIc0JHdc9E0n54XlzIPNp1oPdrvT9EXEOH6kjb pH3jw7WxLdTmH1JGfQxftegNH/4hhI0eT56VHdo5CqVutpsC572fVHjlURpo09fI76mv4UG0Ttp cqaDtKhIdwkQv X-Received: by 2002:adf:b348:: with SMTP id k8mr36302727wrd.435.1634570450120; Mon, 18 Oct 2021 08:20:50 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxSU9ALI4vxdT0LUFYoXuruFKnLY/vFTpcmEgvyCKPpz+nFfh4q+eQTHiETxKUF6r7bU2FsEA== X-Received: by 2002:adf:b348:: with SMTP id k8mr36302694wrd.435.1634570449934; Mon, 18 Oct 2021 08:20:49 -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 l5sm12672972wrq.77.2021.10.18.08.20.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 Oct 2021 08:20:49 -0700 (PDT) Message-ID: <96d0ff43-9b25-5f07-3fe8-7bd245ce06e4@redhat.com> Date: Mon, 18 Oct 2021 17:20:48 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.1.0 Subject: Re: [PATCH v2 7/7] KVM: VMX: Only context switch some PT MSRs when they exist Content-Language: en-US To: Xiaoyao Li Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210827070249.924633-1-xiaoyao.li@intel.com> <20210827070249.924633-8-xiaoyao.li@intel.com> <50b4c1f0-be96-c1b5-aab1-69f4f61ec43f@redhat.com> From: Paolo Bonzini In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 18/10/21 16:04, Xiaoyao Li wrote: >> >> If intel_pt_validate_hw_cap is not fast enough, it should be optimized. >> Something like this: > > If I understand correctly, you mean we don't need to cache the existence > with two variable, right? > Yes, exactly. Paolo