Changes/FEX

Integrate FEX in Fedora Linux

This is a proposed Change for Fedora Linux.
This document represents a proposed Change. As part of the Changes process, proposals are publicly announced in order to receive community feedback. This proposal will only be implemented if approved by the Fedora Engineering Steering Committee.

Summary

FEX is a fast emulator that allows one to run x86 and x86-64 binaries on an AArch64 Linux host. FEX requires a number of supporting components, including a RootFS image, and integration with krun to support 16k page-size hosts. The purpose of this Change is to integrate FEX itself and its supporting components into Fedora Linux, to provide a delightful out-of-box experience for users that want to run x86 and x86-64 binaries on their aarch64 systems. This also includes integration into the AArch64 Fedora KDE spin as a non-blocking component of the spin.

Owner

• Name: Davide Cavalca, Neal Gompa, Alyssa Rosenzweig
• Name: Asahi SIG
• Email: dcavalca(at)fedoraproject.org, ngompa(at)fedoraproject.org, alyssa(at)rosenzweig.io

Current status

• Targeted release: Fedora Linux 42
• Last updated: 2024-08-30
• [<will be assigned by the Wrangler> devel thread]
• FESCo issue: <will be assigned by the Wrangler>
• Tracker bug: <will be assigned by the Wrangler>
• Release notes tracker: <will be assigned by the Wrangler>

Detailed Description

<blurb about fex>

The goal of this change is to complete the following:

• Package FEX in Fedora Linux
• Create a Kiwi definition to produce a FEX root filesystem.
• Integrate FEX with krun to support 16k page-size systems
• Create a comps group for FEX and supporting components
• Attach the group to the kde-desktop-environment group
• Write documentation

Feedback

(pending the initial Change discussion)

Benefit to Fedora

Users will be able to run x86 and x86-64 binaries out of the box when running Fedora Linux on their Aarch64 systems. This particularly improves the usability of Fedora KDE for day-to-day usage on AArch64 systems.

Scope

• Proposal owners:
  • DONE: Package FEX - https://src.fedoraproject.org/rpms/fex-emu
  • WIP: Write RootFS Kiwi description - https://pagure.io/fedora-kiwi-descriptions/pull-request/83

• Other developers: review

• Release engineering: #Releng issue number

• Policies and guidelines: N/A (not needed for this Change)

• Trademark approval: N/A (not needed for this Change)

• Alignment with Community Initiatives:

Upgrade/compatibility impact

No expected upgrade or compatibility impact, this is a purely additive Change.

How To Test

1. dnf install @fex-x86-emulation
2. ...
3. profit!

Contingency Plan

• Contingency mechanism: (What to do? Who will do it?) Don't ship this
• Contingency deadline: N/A (not a System Wide Change)
• Blocks release? No

Documentation

The Change owners will write documentation on how to use FEX, both for general Fedora systems and in the context of Fedora Asahi Remix.