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When you try to set a property that has no setter, the error message blames "insufficient permission": $ qemu-system-x86_64 -S -display none -nodefaults -monitor stdio QEMU 7.1.50 monitor - type 'help' for more information (qemu) qom-set /machine type q35 Error: Insufficient permission to perform this operation This implies it could work with "sufficient permission". It can't. Change the error message to: Error: Property 'pc-i440fx-7.2-machine.type' is not writable Do the same for getting a property that has no getter. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20221012153801.2604340-2-armbru@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com>