During September 2025, Prapal focused on stabilizing memory mapping in the microsoft/openvmm hypervisor project by addressing a critical bug in MSHV guest PFN handling. He resolved failures in hypercall operations by correctly deriving the guest PFN through right-shifting the guest address by the page shift, ensuring valid memory mapping parameters. Working primarily in Rust and leveraging low-level system programming and memory management expertise, Prapal’s patch improved runtime reliability and reduced errors during guest memory operations. His disciplined debugging and clear code review practices demonstrated depth in hypervisor development, contributing to more robust integration and code quality within the OpenVMM codebase.