[WIP RFC PATCH 0/6] Generic Firmware Variable Filesystem

[Matthew Garrett]

On Tue, Jun 4, 2019 at 1:01 PM Nayna <nayna at linux.vnet.ibm.com> wrote:
> It seems efivars were first implemented in sysfs and then later
> separated out as efivarfs.
> Refer - Documentation/filesystems/efivarfs.txt.
>
> So, the reason wasn't that sysfs should not be used for exposing
> firmware variables,
> but for the size limitations which seems to come from UEFI Specification.
>
> Is this limitation valid for the new requirement of secure variables ?

I don't think the size restriction is an issue now, but there's a lot
of complex semantics around variable deletion and immutability that
need to be represented somehow.