Re: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations

On Tue, Feb 18, 2025 at 10:53:55AM -0800, Nicolin Chen wrote:

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Is MEV available only in nested mode? Otherwise it perhaps makes sense to turn it on in all configurations in IOMMUFD paths...

I think the arm-smmu-v3's iommufd implementation only supports nested which could be the reason.

I guess what Kevin says is that non-nested STE should set the MEV as well, e.g. BYPASS and ABORT, and perhaps stage-1-only case too where the attaching domain = UNMANAGED.

Ohh okay, got it. Thanks!

Praan