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 6E141C5ACD6 for ; Wed, 18 Mar 2020 17:11:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3F5C22071C for ; Wed, 18 Mar 2020 17:11:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="XvXbUDKc" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726822AbgCRRLg (ORCPT ); Wed, 18 Mar 2020 13:11:36 -0400 Received: from us-smtp-delivery-74.mimecast.com ([63.128.21.74]:31697 "EHLO us-smtp-delivery-74.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726619AbgCRRLf (ORCPT ); Wed, 18 Mar 2020 13:11:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1584551494; 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=vzqv9I5Sh/5ugsjV1X2H8uxVVaA/U2JrzTHi1Jlr7RM=; b=XvXbUDKc51v2LavXQLKC5ekDS5+QKhwvgzY6vxxUrZLKXhY5y1pcG8+VHwGqfON02S3WBn LDhaO7GE7l0iEn4UDFDD5ga8XrkJr1vATvIlOAbSU0sY/JuDOW+rm1d4h9PCeLDaKr0SDT Z+Fjp2LORzd++JUuUVMgQ+SxfztiYn0= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-248-DY50MLRHN1qzGW8jSI0S0w-1; Wed, 18 Mar 2020 13:11:33 -0400 X-MC-Unique: DY50MLRHN1qzGW8jSI0S0w-1 Received: by mail-wm1-f72.google.com with SMTP id f9so1324193wme.7 for ; Wed, 18 Mar 2020 10:11:33 -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=vzqv9I5Sh/5ugsjV1X2H8uxVVaA/U2JrzTHi1Jlr7RM=; b=ren7SXlC1Fm2w8xCwMXbpQcmu71ekRXjLj7n2n3FtmB0CI8Ec2plY1Hyvbux+8Vct4 mf0KGPwROuVHtbBU6tCbxRIJkqg3CmiROpVIw9l+4ILrD/OEum6MdeFH4H5UcjM1Ov8O BnSU1i0BLyJXs10oOZfpk57o4pfKk4xeOXYzkRXvfBSn7cPtsqjkEr7dr2VDGhh9bXGD FvTcH4wiINbqzJ2cAguT3vE5LZTaOdEmVAQPSr+doBlKKEBiBhK9hjF+72Wh9Z7jrpxP Suv0mmIrg0Dmvj8889jDhDpBcbpeKxNgEFkF5MLk6aGCl11LxdB7SJIW0aUJvkQgwEKI MGJQ== X-Gm-Message-State: ANhLgQ1Caoux58Y7iCsvcTtaLESzhbEzym0fDXhNWPfXGEEYflAIEZma vPlAZDM3X+OBWi9rKh7SBb/lyMxUtw+gH9XP5PGGHAe4sxhrP/Dj1bqbtQ6LHIvQbmWMPTsAPpP D7EEtW3ts4pCpPYoTXbu6I1A0 X-Received: by 2002:adf:a54a:: with SMTP id j10mr6885892wrb.188.1584551492179; Wed, 18 Mar 2020 10:11:32 -0700 (PDT) X-Google-Smtp-Source: ADFU+vt9u608gYRp7tO/knBR6K2ZgiFKLlyGeKIepNlMrVma8HthryXIRHihp1d398V+IzLI8vt48w== X-Received: by 2002:adf:a54a:: with SMTP id j10mr6885860wrb.188.1584551491921; Wed, 18 Mar 2020 10:11:31 -0700 (PDT) Received: from [192.168.178.58] ([151.21.15.43]) by smtp.gmail.com with ESMTPSA id l18sm10187921wrr.17.2020.03.18.10.11.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 18 Mar 2020 10:11:31 -0700 (PDT) Subject: Re: [PATCH v2 31/32] KVM: nVMX: Don't flush TLB on nested VM transition with EPT enabled To: Sean Christopherson Cc: Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Ben Gardon , Junaid Shahid , Liran Alon , Boris Ostrovsky , John Haxby , Miaohe Lin , Tom Lendacky References: <20200317045238.30434-1-sean.j.christopherson@intel.com> <20200317045238.30434-32-sean.j.christopherson@intel.com> <97f91b27-65ac-9187-6b60-184e1562d228@redhat.com> <20200317182251.GD12959@linux.intel.com> <218d4dbd-20f1-5bf8-ca44-c53dd9345dab@redhat.com> <20200318170241.GJ24357@linux.intel.com> From: Paolo Bonzini Message-ID: <3c3a4d9b-b213-dfc0-2857-a975e9c20770@redhat.com> Date: Wed, 18 Mar 2020 18:11:28 +0100 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: <20200318170241.GJ24357@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 18/03/20 18:02, Sean Christopherson wrote: > So something like this? > > if (!nested_ept) > kvm_mmu_new_cr3(vcpu, cr3, enable_ept || > nested_cpu_has_vpid(vmcs12)); ... which is exactly nested_has_guest_tlb_tag(vcpu). Well, not exactly but it's a bug in your code above. :) It completely makes sense to use that as the third argument, and while a comment is still needed it will be much smaller. Paolo