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The QERR_ macros are leftovers from the days of "rich" error objects. We've been trying to reduce their remaining use. qmp_query_vm_generation_id() in stubs/vmgenid.c is the last user of QERR_UNSUPPORTED outside qga/. Unlike the stubs we just dropped, it is actually reachable, namely when CONFIG_ACPI_VMGENID is off. It always fails like (qemu) info vm-generation-id Error: this feature or command is not currently supported Turns out the real qmp_query_vm_generation_id() doesn't actually depend on CONFIG_ACPI_VMGENID, and fails safely when it's off. Move it to hw/core/machine-qmp-cmds.c, and drop the stub. The error message becomes Error: VM Generation ID device not found Feels like an improvement to me. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20230207075115.1525-8-armbru@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Juan Quintela <quintela@redhat.com>