Messages in this thread | | | Subject | Re: [RFC v16 0/9] SMMUv3 Nested Stage Setup (IOMMU part) | From | Zhangfei Gao <> | Date | Fri, 3 Dec 2021 20:27:39 +0800 |
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Hi, Eric
On 2021/10/27 下午6:44, Eric Auger wrote: > This series brings the IOMMU part of HW nested paging support > in the SMMUv3. > > The SMMUv3 driver is adapted to support 2 nested stages. > > The IOMMU API is extended to convey the guest stage 1 > configuration and the hook is implemented in the SMMUv3 driver. > > This allows the guest to own the stage 1 tables and context > descriptors (so-called PASID table) while the host owns the > stage 2 tables and main configuration structures (STE). > > This work mainly is provided for test purpose as the upper > layer integration is under rework and bound to be based on > /dev/iommu instead of VFIO tunneling. In this version we also get > rid of the MSI BINDING ioctl, assuming the guest enforces > flat mapping of host IOVAs used to bind physical MSI doorbells. > In the current QEMU integration this is achieved by exposing > RMRs to the guest, using Shameer's series [1]. This approach > is RFC as the IORT spec is not really meant to do that > (single mapping flag limitation). > > Best Regards > > Eric > > This series (Host) can be found at: > https://github.com/eauger/linux/tree/v5.15-rc7-nested-v16 > This includes a rebased VFIO integration (although not meant > to be upstreamed) > > Guest kernel branch can be found at: > https://github.com/eauger/linux/tree/shameer_rmrr_v7 > featuring [1] > > QEMU integration (still based on VFIO and exposing RMRs) > can be found at: > https://github.com/eauger/qemu/tree/v6.1.0-rmr-v2-nested_smmuv3_v10 > (use iommu=nested-smmuv3 ARM virt option) > > Guest dependency: > [1] [PATCH v7 0/9] ACPI/IORT: Support for IORT RMR node
Thanks a lot for upgrading these patches.
I have basically verified these patches on HiSilicon Kunpeng920. And integrated them to these branches. https://github.com/Linaro/linux-kernel-uadk/tree/uacce-devel-5.16 https://github.com/Linaro/qemu/tree/v6.1.0-rmr-v2-nested_smmuv3_v10
Though they are provided for test purpose,
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Thanks
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