[$] Live migration of virtual machines over CXL

Virtual-machine hosting can be a fickle business; once a virtual machinehas been placed on a physical host, there may arise a desire to move it toa different host. The problem with migrating virtual machines, though, isthat there is a period during which the machine is not running; that can bedisruptive even if it is brief. At the 2023 Linux Storage, Filesystem,Memory-Management and BPF Summit, Dragan Stancevic, presentingremotely, showed how CXLshared memory can be used to migrate virtual machines with no offline time.