Worked on the geerlingguy/linux repository to deliver Vhost Worker Mode Selection and reintroduce the kthread API for vhost workers. This feature allowed userspace applications to select between kthread and task worker modes through new IOCTLs, with an additional module parameter enabling default mode configuration. The implementation focused on improving compatibility with legacy vhost applications while ensuring accurate CPU usage accounting aligned with the selected worker mode. Developed in C and leveraging expertise in device drivers, kernel development, and system programming, this work reduced configuration complexity and preserved existing interfaces, addressing both technical requirements and business needs for flexible deployment.