Re: F45 Change Proposal: Grub EFI For Confidential Computing (self-contained)

On Thu, Jun 11, 2026, at 8:49 PM, Aoife Moloney via devel-announce wrote:
> == Detailed Description ==
> 
> There is a need for a smaller, lighter version of the GRUB bootloader
> on UEFI to support booting sealed bootable container images, such as
> for Confidential Computing.
> 
> Since confidential VMs rely on remote attestation, TPM PCR values need
> to be stable and predictable over long periods of time. Updating the
> bootloader results in changes to PCRs, and should therefore be avoided
> if possible.
Show quoted text

For current RHEL 10 CVM images (for Azure and AWS) we boot the UKI directly
instead of having a bootloader in between.

Could we have something in the 'Feedback' section about why there's a need to
have grub2-cc in between.  A few reasons have been discussed in this thread but
they're in disparate places :)

The proposal seems to target mostly virtual machines:

> contains only the modules that are absolutely necessary for VMs, and
> natively supports UKI loading

So it doesn't *feel* like the bootloader would be there to pave over bad
implementations that can't get updated.

Simon
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