Nikunj contributed to the geerlingguy/linux repository by refactoring TSC MSR handling within the x86 Sev module, focusing on enhancing guest stability and security. Using C and leveraging expertise in kernel development and x86 architecture, Nikunj modified the system’s response to writes on GUEST_TSC_FREQ and MSR_IA32_TSC, ensuring these now trigger a #GP exception rather than terminating the guest or ignoring the operation. This approach reduced undefined guest states and improved robustness in MSR handling. The work preserved existing security guarantees for reads under Secure TSC, demonstrating a deep understanding of system programming and careful attention to maintaining compatibility.