iommu_vdevice_alloc
struct iommu_vdevice_alloc vdev;
struct iommu_vdevice_alloc, virt_id),
struct iommu_vdevice_alloc *cmd = ucmd->cmd;
TEST_LENGTH(iommu_vdevice_alloc, IOMMU_VDEVICE_ALLOC, virt_id);
struct iommu_vdevice_alloc cmd = {