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 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 3560FC6783B for ; Wed, 12 Dec 2018 00:39:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 044D22086D for ; Wed, 12 Dec 2018 00:39:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 044D22086D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.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 S1726230AbeLLAjc (ORCPT ); Tue, 11 Dec 2018 19:39:32 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45140 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726211AbeLLAjc (ORCPT ); Tue, 11 Dec 2018 19:39:32 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7606B3082202; Wed, 12 Dec 2018 00:39:31 +0000 (UTC) Received: from redhat.com (ovpn-120-67.rdu2.redhat.com [10.10.120.67]) by smtp.corp.redhat.com (Postfix) with SMTP id 01FB260C44; Wed, 12 Dec 2018 00:39:28 +0000 (UTC) Date: Tue, 11 Dec 2018 19:39:28 -0500 From: "Michael S. Tsirkin" To: Christoph Hellwig Cc: Jean-Philippe Brucker , iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org, devicetree@vger.kernel.org, virtualization@lists.linux-foundation.org, virtio-dev@lists.oasis-open.org, joro@8bytes.org, mark.rutland@arm.com, kevin.tian@intel.com, tnowicki@caviumnetworks.com, marc.zyngier@arm.com, robin.murphy@arm.com, jasowang@redhat.com, will.deacon@arm.com, robh+dt@kernel.org, bhelgaas@google.com, frowand.list@gmail.com, kvmarm@lists.cs.columbia.edu Subject: Re: [PATCH v6 0/7] Add virtio-iommu driver Message-ID: <20181211193249-mutt-send-email-mst@kernel.org> References: <20181211182104.18241-1-jean-philippe.brucker@arm.com> <20181211183101.GA31936@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181211183101.GA31936@infradead.org> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Wed, 12 Dec 2018 00:39:31 +0000 (UTC) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Tue, Dec 11, 2018 at 10:31:01AM -0800, 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? If what I saw is any indication, it allows a very simple implementation of page table shadowing on the host, at the cost of not being able to accelerate with a hardware nested page tables support when available. -- MST