fn punch_holes_in_guest_mem_layout_for_mappings(
guest_mem_layout: Vec<(GuestAddress, u64, MemoryRegionOptions)>,
file_backed_mappings_ram: &[FileBackedMappingParameters],
) -> Result<Vec<(GuestAddress, u64, MemoryRegionOptions)>>
fn punch_holes_in_guest_mem_layout_for_mappings(
guest_mem_layout: Vec<(GuestAddress, u64, MemoryRegionOptions)>,
file_backed_mappings_ram: &[FileBackedMappingParameters],
) -> Result<Vec<(GuestAddress, u64, MemoryRegionOptions)>>