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In case current kernel does not support /dev/iommu, qemu will probably fail first because /sys/bus/pci/devices/*/vfio-dev/ is not present, since QEMU opens it before /dev/iommu. Instead, report an error directly when completing an iommufd object, to inform user that kernel does not support it, with a hint about missing CONFIG_IOMMUFD. We can't do this from initialize as there is no way to return an error, and we don't want to abort at this step. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Cédric Le Goater <clg@redhat.com> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com> Message-ID: <20260319205942.367705-2-pierrick.bouvier@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>