Hello! I have a problem with migration from qemu-v2.6.0 to qemu-v2.5.0. It looks like the slirp networking (-netdev user) is not backward compatible. This is the output I am seeing on the receiving side:
qemu-system-x86_64: savevm: unsupported version 4 for 'slirp' v3 qemu-system-x86_64: load of migration failed: Invalid argument This is the little test machine I am trying to migrate (using tiny core linux iso): qemu-system-x86_64-2.6.0 -machine pc-i440fx-2.5 \ -m 512 \ -cdrom core-current.iso \ -boot d \ -nographic \ -curses \ -netdev user,id=mynet0 \ -device virtio-net,netdev=mynet0,id=net0 The target machine looks like this: qemu-system-x86_64-2.5.0 -machine pc-i440fx-2.5 \ -m 512 \ -cdrom core-current.iso \ -boot d \ -nographic \ -curses \ -netdev user,id=mynet0 \ -device virtio-net,netdev=mynet0,id=net0 \ -incoming tcp:0:4444 I am selecting a v2.5-compatible machine so migration to qemu-2.5 should be possible. The question is: Is the migration of slirp networking backward compatible or is this unsupported for some reason? I tested migration from v2.6 to v2.6 with this configuration and it worked. Thank you, Guenther Hutzl. IBM Deutschland Research & Development GmbH Vorsitzende des Aufsichtsrats: Martina Koederitz Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen Registergericht: Amtsgericht Stuttgart, HRB 243294
