qemu vs libvfio-user

qemu

QEMU git Oracle repository (by oracle)

Qemu Virtualization

Source Code

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libvfio-user

framework for emulating devices in userspace (by nutanix)

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qemu		libvfio-user
	Project
1	Mentions	2
22	Stars	154
-	Growth	3.9%
9.8	Activity	7.0
3 months ago	Latest Commit	19 days ago
C	Language	C
GNU General Public License v3.0 or later	License	BSD 3-clause "New" or "Revised" License

The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

qemu

Posts with mentions or reviews of qemu. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-04-24.

QEMU 8.0.0 – A generic and open source machine emulator and virtualizer
3 projects | news.ycombinator.com | 24 Apr 2023

https://github.com/oracle/qemu
So, they're still separate projects, right? Well, kinda. the mainline project has the vfio-user-server implementation merged in:

libvfio-user

Posts with mentions or reviews of libvfio-user. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-04-24.

QEMU 8.0.0 – A generic and open source machine emulator and virtualizer
3 projects | news.ycombinator.com | 24 Apr 2023

https://github.com/nutanix/libvfio-user
The nutanix repo refers to an oracle-led fork of qemu with the full vfio-user implementation built-in:
Rust in QEMU, host support matrix
4 projects | /r/rust | 17 Sep 2021

Finally, there are various projects around QEMU that are being written in Rust (https://gitlab.com/virtio-fs/virtiofsd-rs, and a few other than are more experimental). https://github.com/nutanix/libvfio-user could really benefit from a native Rust implementation, once the protocol is stable. Then we can implement out of process devices in Rust too.

What are some alternatives?

When comparing qemu and libvfio-user you can also consider the following projects:

qCUDA - qCUDA: GPGPU Virtualization at a New API Remoting Method with Para-virtualization

compiler-team - A home for compiler team planning documents, meeting minutes, and other such things.

QEMU - Official QEMU mirror. Please see https://www.qemu.org/contribute/ for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website.

rust - Rust for the xtensa architecture. Built in targets for the ESP32 and ESP8266

kvm-guest-drivers-windows - Windows paravirtualized drivers for QEMU\KVM

virtiofsd-rs

unikraft - A next-generation cloud native kernel designed to unlock best-in-class performance, security primitives and efficiency savings.

rust - Empowering everyone to build reliable and efficient software.

SheepDog - Distributed Storage System for QEMU