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 28FE3C28CBC for ; Wed, 6 May 2020 09:21:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0101E2078C for ; Wed, 6 May 2020 09:21:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="SMwrOBLn" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728797AbgEFJVY (ORCPT ); Wed, 6 May 2020 05:21:24 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:42788 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728385AbgEFJVX (ORCPT ); Wed, 6 May 2020 05:21:23 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588756881; 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=aIo2zuJchWCSmqy9y7JZdRjvNdfxtS8vv0xwKTDl+iM=; b=SMwrOBLn+Apx9jMwm0pLX+bFiXqleUdeAVLWUYRL+dpRQLJ6rl5Pd1pb2Yiuq3BgopEwML kvALd4BZ9dcPrp2F3VopHGbpPx+w5HjO2ldtVrldAWrEg7l2QmF3ta7fru7A9D8kjOw46I 6jWV846I4/Z3Zn9ASOVX7kBomu997J0= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-363-G5iF5F6aPiyCW8gfT-F_5g-1; Wed, 06 May 2020 05:21:20 -0400 X-MC-Unique: G5iF5F6aPiyCW8gfT-F_5g-1 Received: by mail-wr1-f70.google.com with SMTP id u4so996564wrm.13 for ; Wed, 06 May 2020 02:21:19 -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=aIo2zuJchWCSmqy9y7JZdRjvNdfxtS8vv0xwKTDl+iM=; b=tuVAqITKexhTy7mfMuk98kgTY7XxVtKOPWO9djlBsuSoGiMmwZBQQ3u4CDlh0IObno 4VcB4+weXb4U72D1dz4vKsbMAIcXbzE5aphSYfHMSIS6PVUSfTH0xpaz/hpcEdbqubbB NG7CF5twftEJm3nGnQsVOFn5/mcllNHWCE5WDYSu5ZW7/6LMip2cjVLZ6PCtP7sT/SYk eXC5dA74VJR5tzaiozDbv8L0F6lEcu0rXuVRT0m/SmKrHSk0hvPwhg5+i4buiwgEX8uU LEQPGnPXQQa9i8cKEyWqFvuyVYPW7KViMTzlLA6RpTGG6J+vTtIvzN9udoapzn2PhFNe lO+Q== X-Gm-Message-State: AGi0PuaQbO5M/2pu0pW2B1Hm04kC6Y5/rwZbd2SHFoI57N+p4FkreW+N X8jiO9OsXXCk7auztcJa2z/DmWyVoJUJt8hMu/NMBLCiVAC1q6gX/7bmdZ8EYpY3F/znf9668kX etKicaISzXRhXrEMtG8bVoFAd X-Received: by 2002:a05:600c:225a:: with SMTP id a26mr3297082wmm.104.1588756879041; Wed, 06 May 2020 02:21:19 -0700 (PDT) X-Google-Smtp-Source: APiQypIjTzrGAR4XHcO8KggyM1MB+dxXNV1av9LaxnOCk+jHtQJuOYZkS4SQDdtE1ApTxRl4oA/LKA== X-Received: by 2002:a05:600c:225a:: with SMTP id a26mr3297051wmm.104.1588756878796; Wed, 06 May 2020 02:21:18 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:11d7:2f21:f38b:17e? ([2001:b07:6468:f312:11d7:2f21:f38b:17e]) by smtp.gmail.com with ESMTPSA id 1sm2125032wmz.13.2020.05.06.02.21.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 May 2020 02:21:18 -0700 (PDT) Subject: Re: [patch V4 part 2 15/18] x86/kvm/svm: Handle hardirqs proper on guest enter/exit To: Thomas Gleixner , LKML Cc: x86@kernel.org, "Paul E. McKenney" , Andy Lutomirski , Alexandre Chartre , Frederic Weisbecker , Sean Christopherson , Masami Hiramatsu , Petr Mladek , Steven Rostedt , Joel Fernandes , Boris Ostrovsky , Juergen Gross , Brian Gerst , Mathieu Desnoyers , Josh Poimboeuf , Will Deacon References: <20200505134112.272268764@linutronix.de> <20200505134341.579034898@linutronix.de> <87imh9o3e1.fsf@nanos.tec.linutronix.de> From: Paolo Bonzini Message-ID: Date: Wed, 6 May 2020 11:21:16 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <87imh9o3e1.fsf@nanos.tec.linutronix.de> 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 06/05/20 10:48, Thomas Gleixner wrote: > So for instrumentation, especially interrupt disabled tracing we must > track that change otherwise a latency analysis would claim that > interrupts were disabled for the full time a task spent in user > mode. Oh okay, that's clear now. I would just replace the four bullets in the first comment with this sentence, and remove altogether the three bullets in the second comment. Thanks, Paolo