wiki/virt/vm/firmware.md

title, description, published, date, tags, editor, dateCreated

title	description	published	date	tags	editor	dateCreated
Firmware		true	2025-11-08T10:28:07.779Z		markdown	2022-01-25T14:50:10.751Z

Platform firmware

Virtual devices, including virtual chipsets, are shipping alongside platform firmware.

SeaBIOS

SeaBIOS is an implementation of an x86 BIOS which relies on coreboot. It is used for legacy systems, but also to specialized and cloud optimized guests systems which don't require UEFI.

OVMF

OVMF, which stands for Open Virtual Machine Firmware, is a UEFI-compatible firmware.

It is based on the TianoCore project, which provides an open-source implementation of a platform firmware that follows UEFI specifications.

It is the default method to boot UEFI-based operating systems in a virtual machine.

Under Fedora-based systems such as Phyllome, firmware that can be used by virtual machines are stored in the following directory /usr/share/edk2/ovmf

Name	Feature
OVMF_CODE.fd
OVMF_VARS.fd
OVMF_CODE_4M.qcow2
OVMF_VARS_4M.qcow2
OVMF_CODE_4M.secboot.pcrlock
OVMF_CODE_4M.secboot.qcow2
OVMF_VARS_4M.secboot.qcow2
OVMF_CODE.cc.fd
OVMF_CODE.secboot.fd
OVMF_CODE.secboot.pcrlock
OVMF_VARS.secboot.fd
OVMF.igvm
OVMF.qemuvars.fd
OVMF.stateless.fd
OVMF.stateless.secboot.fd
OVMF.stateless.secboot.pcrlock
OVMF.amdsev.fd
OVMF.inteltdx.fd
OVMF.inteltdx.secboot.fd

MicroVM

Rust Hypervisor Firmware

The Rust Hypervisor Firmware (RHF) is a UEFI-compatible firmware. It is focused on simplicity and performance and is designed to run cloud-centric operating systems.

It is developed alongside the Cloud Hypervisor.

Supported features

	SeaBIOS	OVMF	RHF
BIOS	Yes	No	No
UEFI	No	Yes	Yes
Secure Boot	No	Yes	?
Chipset	i440fx, Q35	i440f, Q35	virt
Guests	Linux, Windows	Linux, Darwin, Windows	Linux, Windows
Virtual Function I/O (VFIO)	No	Yes	Yes

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