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=-2.2 required=3.0 tests=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 CE00EC54FCB for ; Wed, 22 Apr 2020 20:42:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 830AC2071E for ; Wed, 22 Apr 2020 20:42:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726307AbgDVUmG (ORCPT ); Wed, 22 Apr 2020 16:42:06 -0400 Received: from mga11.intel.com ([192.55.52.93]:10492 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725779AbgDVUmG (ORCPT ); Wed, 22 Apr 2020 16:42:06 -0400 IronPort-SDR: kfSrRkHOnSjh6H53DTzMRtYkFQj/8pwM3bMbUb6nGjszav6unI/kh12MgpvQZ7gttDtUEJCelX vVB4KE1Nnjog== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Apr 2020 13:42:05 -0700 IronPort-SDR: xBg8ru2THU27gYbXvzDcJOubD485D4k856TbNQPd/rTurIEctE94R/3lqD1MRTtmV+MJtEHwdg easCQ7x/UWJQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,304,1583222400"; d="scan'208";a="365793601" Received: from romley-ivt3.sc.intel.com ([172.25.110.60]) by fmsmga001.fm.intel.com with ESMTP; 22 Apr 2020 13:42:05 -0700 Date: Wed, 22 Apr 2020 13:41:17 -0700 From: Fenghua Yu To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , H Peter Anvin , David Woodhouse , Lu Baolu , Dave Hansen , Tony Luck , Ashok Raj , Jacob Jun Pan , Dave Jiang , Sohil Mehta , Ravi V Shankar Cc: linux-kernel , x86 , iommu@lists.linux-foundation.org Subject: Re: [PATCH 0/7] x86: tag application address space for devices Message-ID: <20200422204117.GB229170@romley-ivt3.sc.intel.com> References: <1585596788-193989-1-git-send-email-fenghua.yu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1585596788-193989-1-git-send-email-fenghua.yu@intel.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 30, 2020 at 12:33:01PM -0700, Fenghua Yu wrote: > Typical hardware devices require a driver stack to translate application > buffers to hardware addresses, and a kernel-user transition to notify the > hardware of new work. What if both the translation and transition overhead > could be eliminated? This is what Shared Virtual Address (SVA) and ENQCMD > enabled hardware like Data Streaming Accelerator (DSA) aims to achieve. > Applications map portals in their local-address-space and directly submit > work to them using a new instruction. > Hi, maintainers, Any comment on this series? Thanks. -Fenghua