Towards New Migration Protocol with Unified Channels

Explore the complexities and limitations of QEMU's current live migration implementation in this 36-minute conference talk from KVM Forum. Examine how the existing system has evolved over many years with features added incrementally, resulting in constraints such as uni-directional TCP connections, asynchronous channel management, multifd limitations to RAM state only, and postcopy's inability to utilize multifd channels. Understand the coordination challenges between QEMU and management layers like Libvirtd, and discover why certain QEMU features remain inaccessible through virsh and libvirtd interfaces. Learn about proposed solutions for developing a robust migration protocol that can accommodate current requirements while enabling future enhancements, all while maintaining a simple and intuitive overall architecture for virtual machine migration between hosts.