Hi Zhangfei, On 12/7/21 11:35 AM, Zhangfei Gao wrote: > > > On 2021/12/7 下午6:27, Eric Auger wrote: >> Hi Zhangfei, >> >> On 12/3/21 1:27 PM, Zhangfei Gao wrote: >>> 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@xxxxxxxxxx> >> Thank you very much. As you mentioned, until we do not have the >> /dev/iommu integration this is maintained for testing purpose. The SMMU >> changes shouldn't be much impacted though. >> The added value of this respin was to propose an MSI binding solution >> based on RMRRs which simplify things at kernel level. > > Current RMRR solution requires uefi enabled, > and QEMU_EFI.fd has to be provided to start qemu. > > Any plan to support dtb as well, which will be simpler since no need > QEMU_EFI.fd anymore. Yes the solution is based on ACPI IORT nodes. No clue if some DT integration is under work. Shameer? Thanks Eric > > Thanks > >
