You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: regs.rs
    path of file: ./repos/firecracker/src/vmm/src/arch/x86_64
    
    the code of the file until where you have to start completion: // Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//
// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in t
    
pub fn setup_sregs(mem: &GuestMemoryMmap, vcpu: &VcpuFd) -> Result<(), SetupSpecialRegistersError> {
    let mut sregs: kvm_sregs = vcpu
        .get_sregs()
        .map_err(SetupSpecialRegistersError::GetSpecialRegisters)?;

    configure_segments_and_sregs(mem, &mut sregs)
        .map_err(SetupSpecialRegistersError::ConfigureSegmentsAndSpecialRegisters)?;
    setup_page_tables(mem, &mut sregs).map_err(SetupSpecialRegistersError::SetupPageTables)?; // TODO(dgreid) - Can this be done once per system instead?

    vcpu.set_sregs(&sregs)
        .map_err(SetupSpecialRegistersError::SetSpecialRegisters)
}