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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,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 8BD78C433E0 for ; Thu, 18 Mar 2021 09:12:55 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (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 0F0B264E98 for ; Thu, 18 Mar 2021 09:12:55 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0F0B264E98 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id C7FCD84182; Thu, 18 Mar 2021 09:12:54 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fqMtNYr_cD5X; Thu, 18 Mar 2021 09:12:54 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp1.osuosl.org (Postfix) with ESMTP id A7F878405C; Thu, 18 Mar 2021 09:12:53 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 77248C000A; Thu, 18 Mar 2021 09:12:53 +0000 (UTC) Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id E2010C0001 for ; Thu, 18 Mar 2021 09:12:51 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id C38D8430A2 for ; Thu, 18 Mar 2021 09:12:51 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iihXt-pns1Op for ; Thu, 18 Mar 2021 09:12:50 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.8.0 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) by smtp2.osuosl.org (Postfix) with ESMTPS id A352C4309F for ; Thu, 18 Mar 2021 09:12:50 +0000 (UTC) Received: by theia.8bytes.org (Postfix, from userid 1000) id BF6D82D8; Thu, 18 Mar 2021 10:12:47 +0100 (CET) Date: Thu, 18 Mar 2021 10:12:46 +0100 From: Joerg Roedel To: "Raj, Ashok" Subject: Re: [PATCH 2/5] iommu/vt-d: Remove WO permissions on second-level paging entries Message-ID: References: <20210225062654.2864322-1-baolu.lu@linux.intel.com> <20210225062654.2864322-3-baolu.lu@linux.intel.com> <20210304122623.GD26414@8bytes.org> <20210308194746.GA15436@otc-nc-03> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210308194746.GA15436@otc-nc-03> Cc: kevin.tian@intel.com, sanjay.k.kumar@intel.com, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, jacob.jun.pan@intel.com, Will Deacon 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" Hi, On Mon, Mar 08, 2021 at 11:47:46AM -0800, Raj, Ashok wrote: > That is the primary motivation, given that we have moved to 1st level for > general IOVA, first level doesn't have a WO mapping. I didn't know enough > about the history to determine if a WO without a READ is very useful. I > guess the ZLR was invented to support those cases without a READ in PCIe. I Okay, please update the commit message and re-send. I guess these patches are 5.13 stuff. In that case, Baolu can include them into his pull request later this cycle. Regards, Joerg _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu