View file File name : 60-qemu-postcopy-migration.conf Content :# This is needed to support post-copy migration for QEMU run by libvirt, # i.e., unprivileged, as userfaultfd is by default only available to # privileged processes. # It can be safely overridden by a file in /etc/sysctl.d/ in case post-copy # migration is not used on the host. -vm.unprivileged_userfaultfd = 1