December 2025 monthly summary for riscv/riscv-smmtt focusing on business value and technical achievements.

November 2025: Focused documentation improvements for the external debug/trace subsystem in riscv-smmtt, consolidating and clarifying definitions, terminology, sources of configuration values, and access permissions. The work reduces onboarding time, tightens security and functional requirements, and minimizes misinterpretation across hart and supervisor domains.

October 2025: Documentation cleanup and consistency for the RISC-V SMMTT supervisor-domain extensions, consolidating updates across MMPT registers, CSR mappings, QoS configuration, and terminology alignment to improve clarity and reduce integration risk.

September 2025 (2025-09): Delivered targeted improvements for riscv/riscv-smmtt focusing on API modernization, configurable behavior, and code quality to accelerate integration, ensure robust policy enforcement, and improve maintainability. Key outcomes include API evolution (data-* fields renamed to data1/data2; QOSID deprecated; examples updated), configuration and behavior enhancements (device-level ATC handling; per-MPT configuration for MXL/MBE; option to operate without an IOMMU; enhanced rule matching for multiple matches and no-match cases), strengthened IOMMU correctness with explicit ID bounds (0 to MAX) and normative device-id mapping, and naming consistency with I/O usage improvements. Extensive terminology and rendering fixes, busy-bit adjustments, and typo corrections across the codebase contributed to stability and clarity. Documentation improvements included MPT mode table typos fix and reorganized, more readable rules around SW update to valid MPT entries.

August 2025 monthly summary for riscv/riscv-smmtt focusing on memory-translation improvements, IOMPT/SIOMMU enhancements, and codebase consistency. Highlighted work centers on Smmpt64 page size handling, IOMPT ruleid width and SDCL entry management, and across-the-board documentation and naming cleanups to improve maintainability and onboarding.

2025-07 monthly summary focusing on key institutional improvements and documented features. Delivered a supervisor-domain configuration overhaul with SSRM/SSMM and QoS support, including RCID/MCID fields, an operand-2 QoS register, and msdcfg MXLEN alignment. Clarified Smmpt encoding by enforcing NAPOT as mandatory and refined related documentation. Completed extensive documentation polish for consistency across extensions. Fixed a reconfiguration reset issue to minimize downtime during supervisor-domain updates. Overall impact: stronger memory-domain reliability, QoS guarantees, and improved developer onboarding, contributing to reliability, performance, and maintainability.

June 2025 monthly summary for riscv/riscv-smmtt: Delivered a comprehensive documentation refresh covering supervisor interrupt domains, IMSIC integration, external interrupts, and related extensions (Smsdia, Smgeien). Implemented consistent CSR naming conventions and clarified register behavior. Refined cross-references and improved readability; updated terminology and diagrams to reflect MSDEIP/MSDEIE naming (formerly LSDEIP/LSDEIE). Editorial and formatting improvements, including corrected equations rendering. Result: improved maintainability, reduced onboarding time for maintainers, and clearer guidance for integration with IMSIC and related extensions.

May 2025 - Delivered two documentation-focused features for riscv/riscv-smmtt that enhance clarity, consistency, and maintainability. IMSIC Documentation: standardization and readability improvements across guest interrupt files, SIDN numbering, MSI domain descriptions, and chapter headings. MSI Addressing Documentation: clarified MSI address calculation (DXS/DXW) and msdeip semantics for supervisor interrupt domains. Included terminology refinements (CIXS -> DXS) and editorial updates to reduce ambiguity and improve onboarding. Impact: improved developer onboarding, reduced documentation gaps, and ensured alignment with current implementations.

April 2025 monthly summary for riscv/riscv-smmtt: Delivered comprehensive documentation enhancements for RISC-V supervisor interrupt handling, clarifying guest interrupt files, CSR behavior under various configurations, and IMSIC/Smsdia/Smirfdeleg extensions, along with explicit interrupt domain delegation guidance and MSI terminology alignment. Strengthened maintainability by aligning terminology and CI-related messaging, and ensuring accuracy in critical references (e.g., SIDN). This work reduces onboarding time for developers, lowers the risk of supervisor-mode misconfigurations, and supports safer domain delegation with precise MSI semantics.

March 2025: Delivered critical documentation enhancements for interrupt architecture and the Smgirfp/Smirfd extension in the riscv-smmtt project. Focused on clarity, accuracy, and maintainability to support interoperability and future integration efforts.

November 2024: Delivered targeted documentation enhancements for the Ssqosid extension and fixed a critical privilege-handling bug in the RISCV ISA simulator. These changes improve spec alignment, simulation fidelity, and developer onboarding, delivering clear business value and technical robustness.