Hi Vivek, > -----Original Message----- > From: Vivek Kumar Gautam [mailto:vivek.gau...@arm.com] > Sent: 21 January 2021 17:34 > To: Auger Eric <eric.au...@redhat.com>; linux-ker...@vger.kernel.org; > linux-arm-ker...@lists.infradead.org; iommu@lists.linux-foundation.org; > virtualizat...@lists.linux-foundation.org > Cc: j...@8bytes.org; will.dea...@arm.com; m...@redhat.com; > robin.mur...@arm.com; jean-phili...@linaro.org; > alex.william...@redhat.com; kevin.t...@intel.com; > jacob.jun....@linux.intel.com; yi.l....@intel.com; lorenzo.pieral...@arm.com; > Shameerali Kolothum Thodi <shameerali.kolothum.th...@huawei.com> > Subject: Re: [PATCH RFC v1 00/15] iommu/virtio: Nested stage support with > Arm > > 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 > >> @redhat.com/T/ [2] > >> > https://lore.kernel.org/kvmarm/20201116110030.32335-12-eric.auger@red > >> hat.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-platfo > >> rms.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-vi > rtio-iommu
Thanks for this. Do you have a corresponding kvmtool branch mentioned above as public? Thanks, Shameer _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
