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Fabiano Rosas
112b55f0b0
It has always been possible to enable arbitrary migration capabilities and attempt to take a snapshot of the VM with the savevm/loadvm commands as well as their QMP counterparts snapshot-save/snapshot-load. Most migration capabilities are not meant to be used with snapshots and there's a risk of crashing QEMU or producing incorrect behavior. Ideally, every migration capability would either be implemented for savevm or explicitly rejected. Add a compatibility check routine and reject the snapshot command if an incompatible capability is enabled. For now only act on the the two that actually cause a crash: multifd and mapped-ram. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2881 Signed-off-by: Fabiano Rosas <farosas@suse.de> Link: https://lore.kernel.org/r/20251007184213.5990-1-farosas@suse.de Signed-off-by: Peter Xu <peterx@redhat.com>