From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: Re: [PATCH v6 0/7] Add virtio-iommu driver Date: Tue, 11 Dec 2018 19:39:28 -0500 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 Return-path: Sender: List-Post: List-Help: List-Unsubscribe: List-Subscribe: Content-Disposition: inline In-Reply-To: <20181211183101.GA31936@infradead.org> 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 List-Id: devicetree@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