On Fri, Mar 24, 2023 at 11:24 AM Robbie Harwood <rharw...@redhat.com> wrote: > > Ben Cotton <bcot...@redhat.com> writes: > > > https://fedoraproject.org/wiki/Changes/CloudEC2UEFIPreferred > > > > 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 == > > A new feature of EC2 is to be able to register AMIs with a boot mode > > of `uefi-preferred` rather than picking one of `bios` or `uefi`. In > > EC2, aarch64 has always been UEFI, while x86-64 started out as BIOS > > only and some instance types have recently begun to support booting in > > UEFI mode. Previously, an AMI had to pick if it was UEFI or BIOS. With > > `uefi-preferred` it allows an AMI to launch with whatever firmware > > stack is available for the instance type, preferring UEFI when UEFI is > > an option. > > > > This proposal is to register the Fedora EC2 images with > > `uefi-preferred`, having the effect of switching to booting in UEFI > > mode on x86-64 in EC2 where available. > > > > == Owner == > > * Name: [[User:Trawets| Stewart Smith]] [[User:Davdunc| David Duncan]] > > * Email: traw...@amazon.com > > > > > > == Detailed Description == > > Some features of some EC2 instance types (such as secure boot) are > > only available in UEFI mode. There is also the standard set of > > advantages of UEFI over BIOS. All aarch64 instance types in EC2 have > > always been UEFI, while all x86-64 instance types were historically > > all BIOS. Recently, some x86-64 instance types have started to support > > UEFI mode. This was originally implemented as an option for instance > > launches and AMI registration. An AMI could state that it should be > > booted in UEFI mode. An AMI registered for UEFI would *not* boot on > > BIOS-only instance types. This meant that if you wanted to make > > available an OS that could boot on all instance types, you'd need a > > trio of AMIs: aarch64 UEFI, x86-64 BIOS, and x86-64 UEFI. > > > > With the `uefi-preferred` boot mode, one AMI registered for x86-64 > > will boot on UEFI where possible, but also boot BIOS if the instance > > type doesn't support UEFI. > > > > By registering Fedora AMIs with this boot mode, EC2 features that > > require UEFI (such as Secure Boot and NitroTPM) will be able to be > > used in Fedora, while still maintaining compatibility with BIOS only > > instance types. > > > > == Feedback == > > We have started registering Amazon Linux 2023 AMIs with this boot > > mode, albeit quite late in the development cycle of AL2023 due to the > > timing of when the `uefi-preferred` boot mode flag was added to EC2. > > > > == Benefit to Fedora == > > UEFI is becoming more ubiquitous amongst hardware, and operating under > > UEFI inside EC2 unlocks an increasing number of features such as > > Secure Boot and NitroTPM. The benefit for Fedora is a more uniform > > experience across cloud and non-cloud environments, simplifying the > > boot and runtime software stack. > > On behalf of the Fedora bootloader maintainers, thank you for this > change. >
This is something we've been pushing across our cloud partners since I made our images support both boot modes. I'm really happy to finally take the next step to prefer UEFI on AWS. There's still a long tail of partners to work with on moving to UEFI, so we'll still maintain BIOS support for the time being, but it's being worked on. -- 真実はいつも一つ！/ Always, there's only one truth! _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
