Method resolve_launch_plan_backend

crates/openshell-driver-vm/src/driver.rs:1377–1402

(
        &self,
        sandbox_id: &str,
        is_gpu: bool,
        gpu_bdf: Option<String>,
        plan: &mut LaunchPlan,
    )

    #[allow(clippy::result_large_err)]
    fn resolve_launch_plan_backend(
        &self,
        sandbox_id: &str,
        is_gpu: bool,
        gpu_bdf: Option<String>,
        plan: &mut LaunchPlan,
    ) -> Result<(), Status> {
        if plan.kernel_image.is_some() {
            plan.require_backend_feature(BackendFeature::ExternalKernelImage);
        }
        if !plan.guest_init_dropins.is_empty() {
            plan.require_backend_feature(BackendFeature::GuestInitDropins);
        }

        if plan.required_backends.contains(&VmBackend::Qemu)
            || plan.backend == VmBackend::Qemu
            || plan
                .required_backend_features
                .iter()
                .any(|feature| feature.requires_qemu())
        {
            self.configure_qemu_launch_plan(sandbox_id, is_gpu, gpu_bdf, plan)?;
        }

        Ok(())
    }

    #[allow(clippy::result_large_err)]
    fn configure_qemu_launch_plan(