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 CEA9EC55199 for ; Sun, 26 Apr 2020 11:06:49 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A5B322084D for ; Sun, 26 Apr 2020 11:06:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A5B322084D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linutronix.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 7BB6487020; Sun, 26 Apr 2020 11:06:49 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CvorktY+jRXj; Sun, 26 Apr 2020 11:06:49 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id 1293486FF8; Sun, 26 Apr 2020 11:06:49 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id E269DC089E; Sun, 26 Apr 2020 11:06:48 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 84CDDC0172 for ; Sun, 26 Apr 2020 11:06:47 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 741928702D for ; Sun, 26 Apr 2020 11:06:47 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id InZebBqBwPR9 for ; Sun, 26 Apr 2020 11:06:46 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from Galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by hemlock.osuosl.org (Postfix) with ESMTPS id 40D7485CB8 for ; Sun, 26 Apr 2020 11:06:46 +0000 (UTC) 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 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 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 Cc: Fenghua Yu , iommu@lists.linux-foundation.org, x86 , linux-kernel X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" 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 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu