Zhouquan contributed to kernel development on both the geerlingguy/linux and torvalds/linux repositories, focusing on RISC-V KVM improvements. In geerlingguy/linux, Zhouquan enhanced documentation accuracy by correcting function references, clarifying code for future contributors. For torvalds/linux, Zhouquan refactored the KVM self-test suite to consolidate usage of the RISCV_FENCE macro, reducing code duplication and improving maintainability. Additionally, Zhouquan expanded the RISC-V KVM test suite by adding common test cases, strengthening validation and coverage. Working primarily in C and Makefile, Zhouquan demonstrated depth in system programming and testing, delivering targeted changes that improved code clarity and long-term maintainability.