Function import_parameter

vmm/src/igvm/igvm_loader.rs:208–234

Import a parameter to the given parameter area.

(
    parameter_areas: &mut HashMap<u32, ParameterAreaState>,
    info: &IGVM_VHS_PARAMETER,
    parameter: &[u8],
)

// Import a parameter to the given parameter area.
fn import_parameter(
    parameter_areas: &mut HashMap<u32, ParameterAreaState>,
    info: &IGVM_VHS_PARAMETER,
    parameter: &[u8],
) -> Result<(), Error> {
    let (parameter_area, max_size) = match parameter_areas
        .get_mut(&info.parameter_area_index)
        .expect("parameter area should be present")
    {
        ParameterAreaState::Allocated { data, max_size } => (data, max_size),
        ParameterAreaState::Inserted => panic!("igvmfile is not valid"),
    };
    let offset = info.byte_offset as usize;
    let end_of_parameter = offset + parameter.len();

    if end_of_parameter > *max_size as usize {
        // TODO: tracing for which parameter was too big?
        return Err(Error::ParameterTooLarge);
    }

    if parameter_area.len() < end_of_parameter {
        parameter_area.resize(end_of_parameter, 0);
    }

    parameter_area[offset..end_of_parameter].copy_from_slice(parameter);
    Ok(())
}

///
/// Extract guest policy from the IGVM initialization headers.