Hi Vivek, On 1/21/21 6:34 PM, Vivek Kumar Gautam wrote: > Hi Eric, > > > On 1/19/21 2:33 PM, Auger Eric wrote: >> 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@xxxxxxxxxx/T/ >>> >>> [2] >>> https://lore.kernel.org/kvmarm/20201116110030.32335-12-eric.auger@xxxxxxxxxx/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@xxxxxxxxx/ >>> >>> [6] >>> https://lore.kernel.org/kvm/1599734733-6431-3-git-send-email-yi.l.liu@xxxxxxxxx/ >>> >>> [7] >>> https://lore.kernel.org/kvm/1599734733-6431-4-git-send-email-yi.l.liu@xxxxxxxxx/ >>> >>> [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 > > Apologies for the delay. It took a bit of time to sort things out for a > public branch. > The branch is available in my github now. Please have a look. > > https://github.com/vivek-arm/linux/tree/5.11-rc3-nested-pgtbl-arm-smmuv3-virtio-iommu no problem. Thank you for the link. Best Regards Eric > > > > Thanks and regards > Vivek > >> >> 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@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
