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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 BAB95C55199 for ; Sun, 26 Apr 2020 11:06:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8DAD8206CD for ; Sun, 26 Apr 2020 11:06:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726146AbgDZLGq (ORCPT ); Sun, 26 Apr 2020 07:06:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725965AbgDZLGq (ORCPT ); Sun, 26 Apr 2020 07:06:46 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3640DC061A0C for ; Sun, 26 Apr 2020 04:06:46 -0700 (PDT) Received: from p5de0bf0b.dip0.t-ipconnect.de ([93.224.191.11] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jSf7K-0002bR-Hc; Sun, 26 Apr 2020 13:06:34 +0200 Received: by nanos.tec.linutronix.de (Postfix, from userid 1000) id CC4C6100605; Sun, 26 Apr 2020 13:06:33 +0200 (CEST) From: Thomas Gleixner To: Fenghua Yu , 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, Fenghua Yu Subject: Re: [PATCH 2/7] x86/cpufeatures: Enumerate ENQCMD and ENQCMDS instructions In-Reply-To: <1585596788-193989-3-git-send-email-fenghua.yu@intel.com> References: <1585596788-193989-1-git-send-email-fenghua.yu@intel.com> <1585596788-193989-3-git-send-email-fenghua.yu@intel.com> Date: Sun, 26 Apr 2020 13:06:33 +0200 Message-ID: <87y2qisdza.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Fenghua Yu writes: > A user space application can execute ENQCMD instruction to submit work > to device. The kernel executes ENQCMDS instruction to submit work to > device. So a user space application _can_ execute ENQCMD and the kernel executes ENQCMDS. And both submit work to device. > There is a lot of other enabling needed for the instructions to actually > be usable in user space and the kernel, and that enabling is coming later > in the series and in device drivers. That's important information to the enumeration of the instructions in which way? Thanks, tglx