Re: [PATCH v4 0/8] iommu: Remove IOMMU_DEV_FEAT_SVA/_IOPF

[Zhangfei Gao]

Hi, Baolu

On Thu, 13 Mar 2025 at 13:19, Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> wrote:
>
> The new method for driver fault reporting support relies on the domain
> to specify a iopf_handler. The driver should detect this and setup the
> HW when fault capable domains are attached.
>
> Move SMMUv3 to use this method and have VT-D validate support during
> attach so that all three fault capable drivers have a no-op FEAT_SVA and
> _IOPF. Then remove them.
>
> This was initiated by Jason. I'm following up to remove FEAT_IOPF and
> further clean up.
>
> The whole series is also available at github:
> https://github.com/LuBaolu/intel-iommu/commits/iommu_no_feat-v4

I got an issue on this branch.

Linux 6.14-rc4 + iommu_no_feat-v2
drivers/pci/quirks.c
quirk_huawei_pcie_sva will set dma-can-stall first
arm_smmu_probe_device will check dma-can-stall and set stall_enabled
accordingly.

This branch
arm_smmu_probe_device happens first, when dma-can-stall = 0, so
stall_enabled =0.
Then drivers/pci/quirks.c: quirk_xxx happens

Still in checking.

And this branch does not need these two patches, right?
c7b1397bef3c iommu/arm-smmu-v3: Implement arm_smmu_get_msi_mapping_domain
5cd34634a73e iommu/dma: Support MSIs through nested domains

Thanks