efivarfs vs sysfs-efivars

[dkwo]

I was trying to understand better how efi variables works.
I realised our kernel has both the old and new version, which leads to displaying two sets of efi variables:

$ ls /sys/firmware/efi/vars/
Display all 141 possibilities? (y or n)
$ ls /sys/firmware/efi/efivars/
Display all 139 possibilities? (y or n)

This is due to having both options:

CONFIG_EFI_VARS=y
CONFIG_EFIVAR_FS=y

According to Arch wiki, the first one should be avoided.

UEFI Runtime Variables Support (old efivars sysfs interface - /sys/firmware/efi/vars). This option should be disabled to prevent any potential issues with both efivarfs and sysfs-efivars enabled.

Can anyone clarify what the correct thing to do is here, and whether we should set CONFIG_EFI_VARS=n?
Thanks.

[dkwo]

Also according to https://lkml.org/lkml/2013/4/16/473 , the older option is deprecated.

[dkwo]

@leahneukirchen Do you think we could set CONFIG_EFI_VARS=m or unset it, in the next 5.15 kernel update?

[leahneukirchen]

Will queue, yes.