Test compile gripes: hw/xen/xen-common.c: In function ‘xen_init’: hw/xen/xen-common.c:147:5: warning: implicit declaration of function ‘register_compat_prop’ [-Wimplicit-function-declaration] register_compat_prop("migration", "store-global-state", "off"); ^~~~~~~~~~~~~~~~~~~~ hw/xen/xen-common.c:147:5: warning: nested extern declaration of ‘register_compat_prop’ [-Wnested-externs]
You might want to install Xen development packages to catch such issues earlier. Test run: $ qemu-system-x86_64 -device migration,help migration.skip-section-footer=bool migration.store-global-state=bool migration.only-migratable=bool migration.skip-configuration=bool What would adding this device do?