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=-5.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 339FFC47080 for ; Tue, 1 Jun 2021 03:10:13 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 765C06135D for ; Tue, 1 Jun 2021 03:10:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 765C06135D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 28C31402EF; Tue, 1 Jun 2021 03:10:12 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Vnkf49z0nInT; Tue, 1 Jun 2021 03:10:11 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp4.osuosl.org (Postfix) with ESMTP id A78B4402BF; Tue, 1 Jun 2021 03:10:10 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 7B106C000D; Tue, 1 Jun 2021 03:10:10 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [IPv6:2605:bc80:3010::138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 878EAC0001 for ; Tue, 1 Jun 2021 03:10:08 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 6920D8305C for ; Tue, 1 Jun 2021 03:10:08 +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 Bm7PRM_pzgLK for ; Tue, 1 Jun 2021 03:10:07 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by smtp1.osuosl.org (Postfix) with ESMTPS id 5BB5283054 for ; Tue, 1 Jun 2021 03:10:07 +0000 (UTC) IronPort-SDR: aC5MM6hSXBOvnDdRp+TXng27qmi290aVhHaau95Ha6ZvPrFElVNSNrFtYDua2e66Ahe4VhyWJp 23JnDkvStYUQ== X-IronPort-AV: E=McAfee;i="6200,9189,10001"; a="267338423" X-IronPort-AV: E=Sophos;i="5.83,239,1616482800"; d="scan'208";a="267338423" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 May 2021 20:10:04 -0700 IronPort-SDR: ULzOL29Vz/IvsNNwQwQA6U77N3rMZEqYfgfyjQyFc8zsTXp9NGuDPeuj9u/nToeVpAZVE4iwh8 yIPDfw8wzWLg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.83,239,1616482800"; d="scan'208";a="632725264" Received: from allen-box.sh.intel.com (HELO [10.239.159.105]) ([10.239.159.105]) by fmsmga006.fm.intel.com with ESMTP; 31 May 2021 20:10:01 -0700 Subject: Re: [RFC] /dev/ioasid uAPI proposal To: Jason Gunthorpe , Liu Yi L References: <20210528233649.GB3816344@nvidia.com> <20210531193157.5494e6c6@yiliu-dev> <20210531180911.GX1002214@nvidia.com> From: Lu Baolu Message-ID: <6ca65628-1c0e-4ae3-6357-1493f993349e@linux.intel.com> Date: Tue, 1 Jun 2021 11:08:53 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210531180911.GX1002214@nvidia.com> Content-Language: en-US Cc: Jean-Philippe Brucker , "Tian, Kevin" , "Jiang, Dave" , "Raj, Ashok" , "kvm@vger.kernel.org" , Jonathan Corbet , Robin Murphy , Jason Wang , LKML , "iommu@lists.linux-foundation.org" , Kirti Wankhede , "Alex Williamson \(alex.williamson@redhat.com\)" , David Gibson , David Woodhouse 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-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 6/1/21 2:09 AM, Jason Gunthorpe wrote: >>> device bind should fail if the device somehow isn't compatible with >>> the scheme the user is tring to use. >> yeah, I guess you mean to fail the device attach when the IOASID is a >> nesting IOASID but the device is behind an iommu without nesting support. >> right? > Right.. > Just want to confirm... Does this mean that we only support hardware nesting and don't want to have soft nesting (shadowed page table in kernel) in IOASID? Best regards, baolu _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu