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=-2.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, HK_RANDOM_FROM,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 20246C433E1 for ; Wed, 19 Aug 2020 13:34:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F0C76208B3 for ; Wed, 19 Aug 2020 13:34:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FB4REDJR" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728175AbgHSNeV (ORCPT ); Wed, 19 Aug 2020 09:34:21 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:28256 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728597AbgHSNeA (ORCPT ); Wed, 19 Aug 2020 09:34:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1597844038; 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: in-reply-to:in-reply-to:references:references; bh=1A3YVzHwJmiHNz1WhEQhMZMMatTxl2bdR9e5Zus2ktM=; b=FB4REDJRLTLSWsOhnrXL/eVmelpVfXKCTkc21NLtVpChBOjwMyarNJfGYnW6oOVo++eFMi /hq/+RtGvsaP8NaoiinmErr9fREV4inQPknJtb83O1TZfnOtHWFfDHJPkCs2cXnYxQplVy F/fAaAjNbDYcock6lhpEQ6El9NhCfHQ= Received: from mail-oo1-f72.google.com (mail-oo1-f72.google.com [209.85.161.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-162-QjAunj-aMS6O6mbdt8V1rw-1; Wed, 19 Aug 2020 09:33:57 -0400 X-MC-Unique: QjAunj-aMS6O6mbdt8V1rw-1 Received: by mail-oo1-f72.google.com with SMTP id z2so11455547ooi.18 for ; Wed, 19 Aug 2020 06:33:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=1A3YVzHwJmiHNz1WhEQhMZMMatTxl2bdR9e5Zus2ktM=; b=YxT5jxgmZBOeo0NQZLuXyrZ72nrUP5N05uP90FJR0/xbovGOskzxjNMbYOlNYby04H TEgK5KZTxk9RbJSJ1MhEiIBx8faJXqUbvcOUm7TeTJpK7FIBBLszz+89w5SN07tPVVG8 4NynQO7XjPCZSZeYttrvxIknzuvFVhl3JlB3BDxsOT7Qi22XOtnj7LfAJ3arTSejNHoj 89FskpT1oLJWZG5sygnaGhY89mA4r4hzns+FgvF3XNWLUYEsFiOxNX5SDyslcAnOJF1/ C1hreznPxZ0rArMkXIOywFpniGmp9oBVlccYNieevixOZxWQJoHbdbZr9l4CHysEPYF0 hUaQ== X-Gm-Message-State: AOAM530SCDxwRD/lQkcnAf/xvCXH/n310Q3LGbnKZcxzBFBbxtjJr0xa cMXrunyYatDxxLi7bexav6okVyr38njLxGIY6o40J7kkQ3mXZ0sdlpN+d4OzY7zzE20b2gszw5j o1SVlDozAmb7tpkh1ZwgKCEct4xPMZtRtcARk X-Received: by 2002:a9d:6e1:: with SMTP id 88mr18165961otx.178.1597844036069; Wed, 19 Aug 2020 06:33:56 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxDK4ZmVu++rFkaYtt43Tpk3Yf8PlFZGZT7z4I0jOccmzf4KD2leJPmhiIIUxoTN+497qRQJkjMR8MX0o9jLYk= X-Received: by 2002:a9d:6e1:: with SMTP id 88mr18165944otx.178.1597844035864; Wed, 19 Aug 2020 06:33:55 -0700 (PDT) MIME-Version: 1.0 References: <20200716135303.276442-1-jarkko.sakkinen@linux.intel.com> <20200716135303.276442-22-jarkko.sakkinen@linux.intel.com> <20200810222317.GG14724@linux.intel.com> <20200818145234.GC132200@linux.intel.com> <20200818150627.GD132200@linux.intel.com> <20200818164353.GH137138@linux.intel.com> In-Reply-To: <20200818164353.GH137138@linux.intel.com> From: Nathaniel McCallum Date: Wed, 19 Aug 2020 09:33:45 -0400 Message-ID: Subject: Re: [PATCH v36 21/24] x86/vdso: Implement a vDSO for Intel SGX enclave call To: Jarkko Sakkinen Cc: Sean Christopherson , X86 ML , linux-sgx@vger.kernel.org, LKML , Andy Lutomirski , Jethro Beekman , Cedric Xing , Andrew Morton , Andy Shevchenko , asapek@google.com, Borislav Petkov , chenalexchen@google.com, Conrad Parker , cyhanish@google.com, Dave Hansen , "Huang, Haitao" , Josh Triplett , "Huang, Kai" , "Svahn, Kai" , Keith Moyer , Christian Ludloff , Andy Lutomirski , Neil Horman , Patrick Uiterwijk , David Rientjes , Thomas Gleixner , yaozhangx@google.com Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=nmccallu@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Sender: linux-sgx-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org On Tue, Aug 18, 2020 at 12:44 PM Jarkko Sakkinen wrote: > > On Tue, Aug 18, 2020 at 11:15:32AM -0400, Nathaniel McCallum wrote: > > That seems like overkill to me. I'm just asking for one additional mov > > instruction. :) > > I started to consider eBPF since the complexity and constraints of the > callback look like an overkill and without doubt will be a burden to > maintain. That feels to me like more complexity just to move the existing complexity from one place to another.