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 50F59C2D0EC for ; Fri, 10 Apr 2020 18:44:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2DBED20801 for ; Fri, 10 Apr 2020 18:44:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="RhcMe8Rx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726708AbgDJSoC (ORCPT ); Fri, 10 Apr 2020 14:44:02 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:30480 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726177AbgDJSoB (ORCPT ); Fri, 10 Apr 2020 14:44:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1586544241; 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=muV+cJsdsOKsLWWU/F5WJmj/GF+e031GyF6t6y1qNfQ=; b=RhcMe8RxIeWZT8jpoFMVLiQWmqNrxFvkLEP6CCsoXmO/6X0X2NgS0Iqi57h+yzC774D7LA Kqfhj0sJtD0SXJsedJAv8WhFtfzMciRYuAAbFnvY0FYHa5l7oFA5B1Rnd9DET+W0krGa0N ZyDV9RjayqpPjd/70szANx3t0eOYBWs= 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-200-e4xwk7cuOX6Ts7iMu8_iFg-1; Fri, 10 Apr 2020 14:43:56 -0400 X-MC-Unique: e4xwk7cuOX6Ts7iMu8_iFg-1 Received: by mail-wr1-f70.google.com with SMTP id m15so1771048wrb.0 for ; Fri, 10 Apr 2020 11:43:56 -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=muV+cJsdsOKsLWWU/F5WJmj/GF+e031GyF6t6y1qNfQ=; b=GCz83XV5z3qQktST9gD4UE7xvsza2vont58BshkuQgOHrR78FkMrStqC4PcYHzYqXS 8LYx1G91IVWG8sL0Srf/jVd6gG8DyoQ9bdBVXl8LGkZ2GShFNM/RTYlBZ6plh4UIIl5z lx/XZ+W8CHUBW4+0ECH1UpqbkjqK+0lILXMqcy8AqAi79dAoQSzJoVRtXgvwI3FWYiK+ WmxLXkjRkrr8pQhLYdfE+Z8rtK2l3ubiyT/vnbDOtynH7IiLReX2RuARnvFSlykcfT+H 8aOs4OYv1GU9nuF/WVuIeh20b27becfizEuq9tJEVakYtjpK5oTHS1CZqyzb8dkkQ7j/ pZlQ== X-Gm-Message-State: AGi0Pua6mlEFkRzZzpq6/mtIaZoQUTxjHFlJ8JTfpWKUV5hGPbDkAdB9 UniYmH+gARZzIdPTTsuqNtuP9AH6mlxfn9LR4UV5SIdAZTyTlD0tBFhj/vMpBShhHrSBSCmqT3f CY0qIDRCupIwi X-Received: by 2002:adf:fc45:: with SMTP id e5mr5496595wrs.427.1586544235733; Fri, 10 Apr 2020 11:43:55 -0700 (PDT) X-Google-Smtp-Source: APiQypKRX6u3Awun5ouqjbkGartZIXgkX3B2/ELx/x4dsaREKRdnRPWG6TGFHO1CznRrhFt8aqSIWg== X-Received: by 2002:adf:fc45:: with SMTP id e5mr5496570wrs.427.1586544235489; Fri, 10 Apr 2020 11:43:55 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:c938:f991:b948:b0ca? ([2001:b07:6468:f312:c938:f991:b948:b0ca]) by smtp.gmail.com with ESMTPSA id v7sm3908396wrs.96.2020.04.10.11.43.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Apr 2020 11:43:54 -0700 (PDT) Subject: Re: [PATCH v2] KVM: X86: Ultra fast single target IPI fastpath To: Sean Christopherson Cc: Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Haiwei Li References: <20200410174703.1138-1-sean.j.christopherson@intel.com> From: Paolo Bonzini Message-ID: Date: Fri, 10 Apr 2020 20:43:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200410174703.1138-1-sean.j.christopherson@intel.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 10/04/20 19:47, Sean Christopherson wrote: > If that's open-coded in vmx_vcpu_run(), I'm ok with doing the > fast-IPI handler immediately after the failure checks. > > And fast-IPI aside, the code could use a bit of optimization to > prioritize successful VM-Enter, which would slot in nicely as a prep > patch. Yes, I agree with these. Paolo