Re: [RFC v8 7/7] tests/qtest: Add SMMUv3 bare-metal test using iommu-testdev

[Fabiano Rosas <farosas@suse.de>]

Tao Tang <tangtao1634@phytium.com.cn> writes:

> Add a qtest suite that validates ARM SMMUv3 translation without guest
> firmware or OS. The tests leverage iommu-testdev to trigger DMA
> operations and the qos-smmuv3 library to configure IOMMU translation
> structures.
>
> This test suite targets the virt machine and covers:
> - Stage 1 only translation (VA -> PA via CD page tables)
> - Stage 2 only translation (IPA -> PA via STE S2 tables)
> - Nested translation (VA -> IPA -> PA, Stage 1 + Stage 2)
> - Design to extended to support multiple security spaces
>     (Non-Secure, Secure, Root, Realm)
>
> Each test case follows this sequence:
> 1. Initialize SMMUv3 with appropriate command/event queues
> 2. Build translation tables (STE/CD/PTE) for the target scenario
> 3. Configure iommu-testdev with IOVA and DMA attributes via MMIO
> 4. Trigger DMA and validate successful translation
> 5. Verify data integrity through a deterministic write-read pattern
>
> This bare-metal approach provides deterministic IOMMU testing with
> minimal dependencies, making failures directly attributable to the SMMU
> translation path.
>
> Signed-off-by: Tao Tang <tangtao1634@phytium.com.cn>
> Tested-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>

Reviewed-by: Fabiano Rosas <farosas@suse.de>