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=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 2C1BCC43461 for ; Wed, 16 Sep 2020 16:34:10 +0000 (UTC) Received: from fraxinus.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 9FBF620732 for ; Wed, 16 Sep 2020 16:34:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9FBF620732 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=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 fraxinus.osuosl.org (Postfix) with ESMTP id 6471086ACA; Wed, 16 Sep 2020 16:34:09 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FQufCa-NbUQE; Wed, 16 Sep 2020 16:34:08 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id 4936C86AD8; Wed, 16 Sep 2020 16:34:08 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 30DA9C0859; Wed, 16 Sep 2020 16:34:08 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 5D3C6C0051 for ; Wed, 16 Sep 2020 16:34:06 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by silver.osuosl.org (Postfix) with ESMTP id 358882D002 for ; Wed, 16 Sep 2020 16:34:06 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from silver.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id V+soaCKMU+vi for ; Wed, 16 Sep 2020 16:34:04 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by silver.osuosl.org (Postfix) with ESMTPS id 63276207A4 for ; Wed, 16 Sep 2020 16:34:04 +0000 (UTC) IronPort-SDR: +NNV/29QZL7qNdE241R23U/o+PHYxrpsKCCcZF2NYp5D9V1ZZWcNXQIWo/r4VH2OFd4XoSLrR9 rOzRroIYEBVA== X-IronPort-AV: E=McAfee;i="6000,8403,9746"; a="223694256" X-IronPort-AV: E=Sophos;i="5.76,433,1592895600"; d="scan'208";a="223694256" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Sep 2020 09:33:46 -0700 IronPort-SDR: JwVurvYhdZ9tRNeyZ2bbSVR/msRNcTlCZbI75pYea8hcHpWEOxy1xzYyq7jZQ44LRp/Ad7T+y3 RKc/qzoQ1Cbg== X-IronPort-AV: E=Sophos;i="5.76,433,1592895600"; d="scan'208";a="307104962" Received: from otc-nc-03.jf.intel.com (HELO otc-nc-03) ([10.54.39.36]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Sep 2020 09:33:45 -0700 Date: Wed, 16 Sep 2020 09:33:43 -0700 From: "Raj, Ashok" To: Jason Gunthorpe Subject: Re: [PATCH v7 00/16] vfio: expose virtual Shared Virtual Addressing to VMs Message-ID: <20200916163343.GA76252@otc-nc-03> References: <20200914122328.0a262a7b@x1.home> <20200914190057.GM904879@nvidia.com> <20200914224438.GA65940@otc-nc-03> <20200915113341.GW904879@nvidia.com> <20200915181154.GA70770@otc-nc-03> <20200915184510.GB1573713@nvidia.com> <20200915150851.76436ca1@jacob-builder> <20200915235126.GK1573713@nvidia.com> <20200915171319.00003f59@linux.intel.com> <20200916150754.GE6199@nvidia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200916150754.GE6199@nvidia.com> User-Agent: Mutt/1.5.24 (2015-08-30) Cc: yi.y.sun@intel.com, Jean-Philippe Brucker , kevin.tian@intel.com, kvm@vger.kernel.org, "Michael S. Tsirkin" , stefanha@gmail.com, Jason Wang , jun.j.tian@intel.com, Alex Williamson , iommu@lists.linux-foundation.org, "Jacob Pan \(Jun\)" , Ashok Raj , hao.wu@intel.com 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" On Wed, Sep 16, 2020 at 12:07:54PM -0300, Jason Gunthorpe wrote: > On Tue, Sep 15, 2020 at 05:22:26PM -0700, Jacob Pan (Jun) wrote: > > > If user space wants to bind page tables, create the PASID with > > > /dev/sva, use ioctls there to setup the page table the way it wants, > > > then pass the now configured PASID to a driver that can use it. > > > > Are we talking about bare metal SVA? > > What a weird term. Glad you noticed it at v7 :-) Any suggestions on something less weird than Shared Virtual Addressing? There is a reason why we moved from SVM to SVA. > > > If so, I don't see the need for userspace to know there is a > > PASID. All user space need is that my current mm is bound to a > > device by the driver. So it can be a one-step process for user > > instead of two. > > You've missed the entire point of the conversation, VDPA already needs > more than "my current mm is bound to a device" You mean current version of vDPA? or a potential future version of vDPA? Cheers, Ashok _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu