RISC-V IOMMU

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Interrupt Remapping

MSI / MSI-X

There are two modes for translating MSIs:

• msiptp.MODE = Off: MSIs are translated through the DMA page tables as if they're regular memory writes.
• msiptp.MODE = Flat: The DMA page tables are ignored iff an IOVA matches (iova & msi_addr_mask) == msi_addr_pattern. It is translated through a virtual interrupt file.

MSIs are expected to be redirected to a virtual IMSIC.

See Also

External Links

• RISC-V IOMMU Architecture Specification (Version v1.0.1, 2026-02-22: Ratified)