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Tue, 19 Jan 2021 04:03:36 -0500 X-MC-Unique: QR70-h6vPom3FGRmfyvqIg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3EB831800D41; Tue, 19 Jan 2021 09:03:34 +0000 (UTC) Received: from [10.36.112.67] (ovpn-112-67.ams2.redhat.com [10.36.112.67]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C0C072C303; Tue, 19 Jan 2021 09:03:24 +0000 (UTC) Subject: Re: [PATCH RFC v1 00/15] iommu/virtio: Nested stage support with Arm To: Vivek Gautam , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, virtualization@lists.linux-foundation.org References: <20210115121342.15093-1-vivek.gautam@arm.com> From: Auger Eric Message-ID: Date: Tue, 19 Jan 2021 10:03:22 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20210115121342.15093-1-vivek.gautam@arm.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210119_040342_250702_B7E275EE X-CRM114-Status: GOOD ( 29.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jean-philippe@linaro.org, kevin.tian@intel.com, jacob.jun.pan@linux.intel.com, mst@redhat.com, joro@8bytes.org, will.deacon@arm.com, shameerali.kolothum.thodi@huawei.com, alex.williamson@redhat.com, yi.l.liu@intel.com, lorenzo.pieralisi@arm.com, robin.murphy@arm.com 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 Hi Vivek, On 1/15/21 1:13 PM, Vivek Gautam wrote: > This patch-series aims at enabling Nested stage translation in guests > using virtio-iommu as the paravirtualized iommu. The backend is supported > with Arm SMMU-v3 that provides nested stage-1 and stage-2 translation. > > This series derives its purpose from various efforts happening to add > support for Shared Virtual Addressing (SVA) in host and guest. On Arm, > most of the support for SVA has already landed. The support for nested > stage translation and fault reporting to guest has been proposed [1]. > The related changes required in VFIO [2] framework have also been put > forward. > > This series proposes changes in virtio-iommu to program PASID tables > and related stage-1 page tables. A simple iommu-pasid-table library > is added for this purpose that interacts with vendor drivers to > allocate and populate PASID tables. > In Arm SMMUv3 we propose to pull the Context Descriptor (CD) management > code out of the arm-smmu-v3 driver and add that as a glue vendor layer > to support allocating CD tables, and populating them with right values. > These CD tables are essentially the PASID tables and contain stage-1 > page table configurations too. > A request to setup these CD tables come from virtio-iommu driver using > the iommu-pasid-table library when running on Arm. The virtio-iommu > then pass these PASID tables to the host using the right virtio backend > and support in VMM. > > For testing we have added necessary support in kvmtool. The changes in > kvmtool are based on virtio-iommu development branch by Jean-Philippe > Brucker [3]. > > The tested kernel branch contains following in the order bottom to top > on the git hash - > a) v5.11-rc3 > b) arm-smmu-v3 [1] and vfio [2] changes from Eric to add nested page > table support for Arm. > c) Smmu test engine patches from Jean-Philippe's branch [4] > d) This series > e) Domain nesting info patches [5][6][7]. > f) Changes to add arm-smmu-v3 specific nesting info (to be sent to > the list). > > This kernel is tested on Neoverse reference software stack with > Fixed virtual platform. Public version of the software stack and > FVP is available here[8][9]. > > A big thanks to Jean-Philippe for his contributions towards this work > and for his valuable guidance. > > [1] https://lore.kernel.org/linux-iommu/20201118112151.25412-1-eric.auger@redhat.com/T/ > [2] https://lore.kernel.org/kvmarm/20201116110030.32335-12-eric.auger@redhat.com/T/ > [3] https://jpbrucker.net/git/kvmtool/log/?h=virtio-iommu/devel > [4] https://jpbrucker.net/git/linux/log/?h=sva/smmute > [5] https://lore.kernel.org/kvm/1599734733-6431-2-git-send-email-yi.l.liu@intel.com/ > [6] https://lore.kernel.org/kvm/1599734733-6431-3-git-send-email-yi.l.liu@intel.com/ > [7] https://lore.kernel.org/kvm/1599734733-6431-4-git-send-email-yi.l.liu@intel.com/ > [8] https://developer.arm.com/tools-and-software/open-source-software/arm-platforms-software/arm-ecosystem-fvps > [9] https://git.linaro.org/landing-teams/working/arm/arm-reference-platforms.git/about/docs/rdn1edge/user-guide.rst Could you share a public branch where we could find all the kernel pieces. Thank you in advance Best Regards Eric > > Jean-Philippe Brucker (6): > iommu/virtio: Add headers for table format probing > iommu/virtio: Add table format probing > iommu/virtio: Add headers for binding pasid table in iommu > iommu/virtio: Add support for INVALIDATE request > iommu/virtio: Attach Arm PASID tables when available > iommu/virtio: Add support for Arm LPAE page table format > > Vivek Gautam (9): > iommu/arm-smmu-v3: Create a Context Descriptor library > iommu: Add a simple PASID table library > iommu/arm-smmu-v3: Update drivers to work with iommu-pasid-table > iommu/arm-smmu-v3: Update CD base address info for user-space > iommu/arm-smmu-v3: Set sync op from consumer driver of cd-lib > iommu: Add asid_bits to arm smmu-v3 stage1 table info > iommu/virtio: Update table format probing header > iommu/virtio: Prepare to add attach pasid table infrastructure > iommu/virtio: Update fault type and reason info for viommu fault > > drivers/iommu/arm/arm-smmu-v3/Makefile | 2 +- > .../arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c | 283 +++++++ > .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 16 +- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 268 +------ > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 4 +- > drivers/iommu/iommu-pasid-table.h | 140 ++++ > drivers/iommu/virtio-iommu.c | 692 +++++++++++++++++- > include/uapi/linux/iommu.h | 2 +- > include/uapi/linux/virtio_iommu.h | 158 +++- > 9 files changed, 1303 insertions(+), 262 deletions(-) > create mode 100644 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c > create mode 100644 drivers/iommu/iommu-pasid-table.h > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel