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 D265FC3F2CD for ; Mon, 2 Mar 2020 18:40:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AB1E921D56 for ; Mon, 2 Mar 2020 18:40:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="TltPo9rW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727541AbgCBSkd (ORCPT ); Mon, 2 Mar 2020 13:40:33 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:45904 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727362AbgCBSkc (ORCPT ); Mon, 2 Mar 2020 13:40:32 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583174431; 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=1X0PQLF6NwaqQ0Dzv48A0q1FZz95BzWsFQZPymTOR4A=; b=TltPo9rWMvjApVCQZ68UK7aBQGjZ2Gqql74arRbuxOs5ArNIo2DF2JFOmw9rBBP8Mp3Haa JMFTloWvovkooL9DUATvMO9BnCoewY2Zdad1RIVosXweW4nPWXfJ5HZ+wGYVKOVTmZpMeT SXXHJ+KyYIb/mgfyzugyINqWdWet6x0= 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-188-6rTeoQNVPxi7B70rqjKtjw-1; Mon, 02 Mar 2020 13:40:30 -0500 X-MC-Unique: 6rTeoQNVPxi7B70rqjKtjw-1 Received: by mail-wr1-f70.google.com with SMTP id w6so79347wrm.16 for ; Mon, 02 Mar 2020 10:40:30 -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=1X0PQLF6NwaqQ0Dzv48A0q1FZz95BzWsFQZPymTOR4A=; b=jJsYzK3qhNdpp3XXjL55GbxEbnV6B2Zh0KwkBAWnVCUDKnXufe2aOjXUqSWGlBMjua tr3FTUSVBb3nmtPk66JiFyhwoJW4wxXELsxjrYDwvRwBPKWarIeWkLVH3a0SRp2slqCr gkfjZiC/6BuSxYK2iTuQJQ8Z1S/7OXd/k3waQ9ZYSAq78/kweLluPZqzTHx0J+bsPLKC KvhimH0CQAvSDgv2HUo/W0h6i7N/hYva9LqK+6eJsUeUKvLBGvytWOjp88eZY3IkbuRP XWku6aJY0as5kQ0m2OnBFeVqEVIXpzR1Abs2GeGPv4u1FaKd0vN3H0IwiY6R1mNWtHn2 FCMQ== X-Gm-Message-State: ANhLgQ2EBwgUlXlEhoroo26l7beeeZmj4hVDq2rQmRAbYAwX6b1UxZyi XMvjk+/l11zR1DGK261STO7SMXe7gTWz/I5vKy/PfbTJoGiY65F6suzOLrx0eC5/ZonRENZiKaR 5ObJ7pClR29Tfsy6OVJkaS9sk X-Received: by 2002:a1c:7907:: with SMTP id l7mr343898wme.37.1583174429142; Mon, 02 Mar 2020 10:40:29 -0800 (PST) X-Google-Smtp-Source: ADFU+vvwC0ey9J226DWJuc8knmd1FpRwvKZZlAuQKol2FcrrUa/BQT+AdmMNebVCCPpOKiNw/O24wA== X-Received: by 2002:a1c:7907:: with SMTP id l7mr343883wme.37.1583174428928; Mon, 02 Mar 2020 10:40:28 -0800 (PST) Received: from [192.168.178.40] ([151.30.85.6]) by smtp.gmail.com with ESMTPSA id b12sm1049163wro.66.2020.03.02.10.40.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Mar 2020 10:40:28 -0800 (PST) Subject: Re: [PATCH v2 10/13] KVM: x86: Shrink the usercopy region of the emulation context To: Vitaly Kuznetsov , Sean Christopherson Cc: Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20200218232953.5724-1-sean.j.christopherson@intel.com> <20200218232953.5724-11-sean.j.christopherson@intel.com> <87r1yhi6ex.fsf@vitty.brq.redhat.com> From: Paolo Bonzini Message-ID: <727b8d16-2bab-6621-1f20-dc024ee65f10@redhat.com> Date: Mon, 2 Mar 2020 19:40:27 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <87r1yhi6ex.fsf@vitty.brq.redhat.com> Content-Type: text/plain; charset=utf-8 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 26/02/20 18:51, Vitaly Kuznetsov wrote: >> + >> + /* Here begins the usercopy section. */ >> + struct operand src; >> + struct operand src2; >> + struct operand dst; > Out of pure curiosity, how certain are we that this is going to be > enough for userspaces? > And also, where exactly are the user copies done? Paolo