Re: [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits

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On 09/06/2022 21:34, Bart Van Assche wrote:
On 6/9/22 10:54, John Garry wrote:
ok, but do you have a system where the UFS host controller is behind an IOMMU? I had the impression that UFS controllers would be mostly found in embedded systems and IOMMUs are not as common on there.

Modern phones have an IOMMU. Below one can find an example from a Pixel 6 phone. The UFS storage controller is not controller by the IOMMU as far as I can see but I wouldn't be surprised if the security team would ask us one day to enable the IOMMU for the UFS controller.

OK, then unfortunately it seems that you have no method to test. I might be able to test USB MSC but I am not even sure if I can even get DMA mappings who length exceeds the IOVA rcache limit there.

Thanks,
John



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