May 2025 performance summary for OpenXiangShan development across XiangShan and NEMU. Focused on security/performance enhancements, extension interoperability, and repository alignment with upstream fixes. Implemented Smcsrind extension support with new CSR definitions and refined permission checks, upgraded the rocket-chip submodule for upcoming features, and strengthened privilege checks in the RISC-V emulator, reducing risk of unauthorized access and improving overall reliability.

April 2025 Monthly Summary (OpenXiangShan projects) — Focused on improving trigger accuracy, register validation, and CSR behavior to increase simulation fidelity and hardware validation reliability across riscv-isa-sim and NEMU. Overall, delivered targeted fixes and defensive enhancements that align with the XiangShan CPU constraints (address-based triggers only) and robust performance monitoring, reducing risk of misconfigurations and stabilizing downstream validation workflows.

March 2025 monthly summary for OpenXiangShan/NEMU focused on hardening memory safety around atomic memory operations by implementing safe MMIO validation. This work ensures AMO, load-reserved, and store-conditional instructions execute only within valid physical memory and respect memory protection rules, preventing erroneous access to MMIO regions. The change reduces risk of crashes and undefined behavior, and improves overall emulator correctness and hardware compatibility.

February 2025 monthly summary for OpenXiangShan/NEMU: Delivered Spike Simulator Dependency Upgrade by bumping the Spike submodule in the ready-to-run workflow to a newer commit (72ab2ee31f024705a1dc51b80d05bfa4378a19f3). This upgrade enhances simulation accuracy and stability, enabling more reliable testing, faster iteration cycles, and closer alignment with the latest Spike features. No major bugs fixed this month; focus was on strengthening the test harness and ensuring reproducible results. Overall impact: stronger QA throughput, more reproducible results across local and CI environments, and reduced risk when validating architectural changes. Technologies/skills demonstrated: Git submodule management, external dependency pinning, integration testing with Spike, and cross-repo collaboration.

Monthly summary for 2025-01 focusing on key features, major bugs fixed, business impact, and technologies demonstrated across the XiangShan projects. Highlights include updates to Spike/NEMU references in ready-to-run for improved reliability, new power-management CSRs enabling hardware-level control, and enhanced testing/difftest workflows for better validation parity.

December 2024 monthly summary for OpenXiangShan development efforts focused on strengthening testing fidelity, cross-repo integration, and expanding hardware extension support, all while tightening interrupt/CSR behavior and CI coverage.

November 2024 performance summary for OpenXiangShan platform: delivered foundational correctness improvements, extended ISA extension support, and enhanced observability across NEMU and XiangShan. Upgraded dependencies to align with the NEMU project, consolidated macro definitions for maintainability, and expanded simulation capabilities to accelerate testing of new extensions. These efforts reduce risk, improve compatibility, and boost developer productivity through clearer debugging and validation workflows.

October 2024: Consolidated improvements across the Spike-based simulation stack and NEMU integration to boost stability, compatibility, and verification reliability. Delivered targeted bug fixes and a key submodule upgrade that align spike references with newer toolchains.