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=-0.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 57000C67839 for ; Tue, 11 Dec 2018 19:08:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2C7F820870 for ; Tue, 11 Dec 2018 19:08:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2C7F820870 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-pci-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726443AbeLKTIH (ORCPT ); Tue, 11 Dec 2018 14:08:07 -0500 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:55694 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726329AbeLKTIH (ORCPT ); Tue, 11 Dec 2018 14:08:07 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id DCFBAEBD; Tue, 11 Dec 2018 11:08:06 -0800 (PST) Received: from [10.1.196.78] (ostrya.cambridge.arm.com [10.1.196.78]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 13FBC3F6A8; Tue, 11 Dec 2018 11:08:03 -0800 (PST) Subject: Re: [PATCH v6 0/7] Add virtio-iommu driver To: Christoph Hellwig Cc: mark.rutland@arm.com, virtio-dev@lists.oasis-open.org, kevin.tian@intel.com, tnowicki@caviumnetworks.com, devicetree@vger.kernel.org, marc.zyngier@arm.com, linux-pci@vger.kernel.org, mst@redhat.com, will.deacon@arm.com, frowand.list@gmail.com, virtualization@lists.linux-foundation.org, iommu@lists.linux-foundation.org, robh+dt@kernel.org, kvmarm@lists.cs.columbia.edu, bhelgaas@google.com, robin.murphy@arm.com, jasowang@redhat.com References: <20181211182104.18241-1-jean-philippe.brucker@arm.com> <20181211183101.GA31936@infradead.org> From: Jean-Philippe Brucker Message-ID: Date: Tue, 11 Dec 2018 19:07:41 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <20181211183101.GA31936@infradead.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On 11/12/2018 18:31, Christoph Hellwig wrote: > On Tue, Dec 11, 2018 at 06:20:57PM +0000, Jean-Philippe Brucker wrote: >> Implement the virtio-iommu driver, following specification v0.9 [1]. >> >> Only minor changes since v5 [2]. I fixed issues reported by Michael and >> added tags from Eric and Bharat. Thanks! >> >> You can find Linux driver and kvmtool device on v0.9 branches [3], >> module and x86 support on virtio-iommu/devel. Also tested with Eric's >> QEMU device [4]. > > Just curious, what is the use case for it? The main use case is assigning a device to guest userspace, using VFIO both in the host and in the guest (the most cited example being DPDK). There are others, and I wrote a little more about them last week: https://www.spinics.net/lists/linux-pci/msg78529.html Thanks, Jean