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HvLoader — HvLoader.efi is an EFI application for loading an external hypervisor loader | Kitploit
Tools/GitHubGitHub/microsoft/hvloader
Embedded Systems SecurityExploitationSecurity VirtualizationHardware SecurityFirmware AnalysisArchived
GitHubmicrosoft/hvloader

HvLoader

HvLoader.efi is an EFI application for loading an external hypervisor loader

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7383 years agoReviewed by Kitploit

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HvLoader Overview

HvLoader.efi is an EFI application for loading an external hypervisor loader.

HvLoader.efi loads a given hypervisor loader binary (DLL, EFI, etc.), and calls it's entry point passing HvLoader.efi ImageHandle. This way the hypervisor loader binary has access to HvLoader.efi's command line options, and use those as configuration parameters. The first HvLoader.efi command line option is the path to hypervisor loader binary.

Currently HvLoader.efi resides in the efi partition, i.e. /boot/efi, and has access to that partition only. Thus, any path arguments need to be relative to /boot/efi partition. This restriction may be relaxed in future updates.

A typical HvLoader.efi grub command may look like the following:

chainloader /HvLoader.efi \lxhvloader.dll MSHV_ROOT=\Windows MSHV_ENABLE=1 MSHV_SCHEDULER_TYPE=0 ...

Setting up the build environment

HvLoader.efi is built in TianoCore EDK2. The build environment was initially tested on a Ubuntu 22.04.1 LTS, but can be set up on Microsoft Windows, macOS, and Unix.
For more information, please refer to Getting Started with EDK2.

On Linux, please follow the instructions at Using EDK2 with Native GCC, and finally clone the repo and build according to Common EDK II Build Instructions for Linux.

Building HvLoader.efi

HvLoader.efi lives as an application in MdeModulePkg, i.e. /MdeModulePkg/Application/HvLoader.

After a successful build of EDK2, you can build HvLoader.efi following the steps below,
running from the root location of edk2:

  1. pushd MdeModulePkg/Application

  2. git clone https://github.com/asherkariv/HvLoader.git

  3. popd

  4. Add HvLoader to MdeModulePkg:

    • Edit MdeModulePkg/MdeModulePkg.dsc
    • Add MdeModulePkg/Application/HvLoader/HvLoader.inf in the [Components] section, for example:
      [Components]
      MdeModulePkg/Application/HelloWorld/HelloWorld.inf MdeModulePkg/Application/HvLoader/HvLoader.inf MdeModulePkg/Application/DumpDynPcd/DumpDynPcd.inf MdeModulePkg/Application/MemoryProfileInfo/MemoryProfileInfo.inf ...

  5. Build HvLoder.efi:
    build -p MdeModulePkg/MdeModulePkg.dsc -m MdeModulePkg/Application/HvLoader/HvLoader.inf

  6. Based on your target configuration (DEBUG/RELEASE), HvLoader.efi is produced at Build/MdeModule/DEBUG_GCC5/X64/HvLoader.efi
    or
    Build/MdeModule/RELEASE_GCC5/X64/HvLoader.efi

Signing HvLoader.efi

HvLoader.efi needs to be signed for secure boot.

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