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=-4.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 80808C433ED for ; Mon, 17 May 2021 15:37:36 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 49CD96112F for ; Mon, 17 May 2021 15:37:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 49CD96112F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=fuRKH1izpD5Nr3KxCRsXmuA/azX3myG4dLX3Fpd4XcM=; b=pP+GqGjsvK3GlW4Bn/nlLoWBF zZlKbOi6NljBRif8ws2EfxUEc0MXL11JFU3sz5fEqL4i8E/ULpq7CNXNLIz+Yw/P6Wg5ORqnFp+d0 tVHTisml+I+ywpUVOO3DB7il8+/k4cq6TsN3gJeSCI/zWorUpANOLaCNfhWcko2eHmOxsuRPL8NV0 ZaBavwSfIven5OUn88wbtNnLl5C1xPsmOskCvBZPlhqEDkqPO8BwcJJQ6Nc6QZlUhZWpH1QPWJll1 /jVuEbwApSMD89/IVRfGWzpca/pQdKbjqN6kb62Oo2wvZhIEaVrLi3Sg2A0/Sa8/2HY1gHG3BvPji 0gr0NPs3w==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lifHA-00FQP0-NV; Mon, 17 May 2021 15:35:24 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lifH5-00FQNv-1x for linux-arm-kernel@desiato.infradead.org; Mon, 17 May 2021 15:35:21 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=+yMFES8MoFleN+D8Xi54sdYLHxzgjd4+goT7rXSofbI=; b=sS/igNZQY41jyhoMsvgUX9UFBx /ydLHWvNvV63lqLfXq6qkGYpOk3McTy1PBRs3vjPM531nwt5VTN8JOcZX55+uq54W3/8kp5zIVNqk vo5m7trC2qri6Y33PXHNbcfupFxGL+tEHD4CsxbozeOypHqTagcX4MVrs/MOPzeIPc13Gsa5BOxKG y7J9Gn33987c5L3ICQfsdYDvUtDP4Dq2J8OYnyZRB76M2fnSPOvLiOMsnjOJ718Q4QiDTQ+seWCqa JNsVIbdBA9248myyLyEk9fQ/dQz0sOefCbk/MY2PL5qsiQX0TMVfolIgfY38rmPiuaHZLXc0wa1Ky swRq1YrA==; Received: from 8bytes.org ([2a01:238:4383:600:38bc:a715:4b6d:a889] helo=theia.8bytes.org) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lifH1-00Dvhk-G9 for linux-arm-kernel@lists.infradead.org; Mon, 17 May 2021 15:35:17 +0000 Received: by theia.8bytes.org (Postfix, from userid 1000) id 1A3C23A4; Mon, 17 May 2021 17:35:12 +0200 (CEST) Date: Mon, 17 May 2021 17:35:10 +0200 From: Joerg Roedel To: Jason Gunthorpe Cc: "Tian, Kevin" , Christoph Hellwig , Alex Williamson , David Woodhouse , Lu Baolu , Will Deacon , Kirti Wankhede , "linux-arm-kernel@lists.infradead.org" , "iommu@lists.linux-foundation.org" , "kvm@vger.kernel.org" Subject: Re: [PATCH 3/6] vfio: remove the unused mdev iommu hook Message-ID: References: <20210513120058.GG1096940@ziepe.ca> <20210514121925.GI1096940@ziepe.ca> <20210514133143.GK1096940@ziepe.ca> <20210517123010.GO1096940@ziepe.ca> <20210517133500.GP1096940@ziepe.ca> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210517133500.GP1096940@ziepe.ca> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210517_083515_718933_811801F9 X-CRM114-Status: GOOD ( 12.29 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, May 17, 2021 at 10:35:00AM -0300, Jason Gunthorpe wrote: > Well, I'm sorry, but there is a huge other thread talking about the > IOASID design in great detail and why this is all needed. Jumping into > this thread without context and basically rejecting all the > conclusions that were reached over the last several weeks is really > not helpful - especially since your objection is not technical. > > I think you should wait for Intel to put together the /dev/ioasid uAPI > proposal and the example use cases it should address then you can give > feedback there, with proper context. Yes, I think the next step is that someone who read the whole thread writes up the conclusions and a rough /dev/ioasid API proposal, also mentioning the use-cases it addresses. Based on that we can discuss the implications this needs to have for IOMMU-API and code. >From the use-cases I know the mdev concept is just fine. But if there is a more generic one we can talk about it. Regards, Joerg _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel