[ISSUE] efivarfs vs sysfs-efivars

[ISSUE] efivarfs vs sysfs-efivars

[dkwo]

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New issue by dkwo on void-packages repository

https://github.com/void-linux/void-packages/issues/34117

Description:
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.

Re: efivarfs vs sysfs-efivars

[dkwo]

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New comment by dkwo on void-packages repository

https://github.com/void-linux/void-packages/issues/34117#issuecomment-972748491

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

Re: efivarfs vs sysfs-efivars

[dkwo]

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New comment by dkwo on void-packages repository

https://github.com/void-linux/void-packages/issues/34117#issuecomment-974043337

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

Re: efivarfs vs sysfs-efivars

[leahneukirchen]

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New comment by leahneukirchen on void-packages repository

https://github.com/void-linux/void-packages/issues/34117#issuecomment-974086666

Comment:
Will queue, yes.

Re: [ISSUE] [CLOSED] efivarfs vs sysfs-efivars

[leahneukirchen]

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Closed issue by dkwo on void-packages repository

https://github.com/void-linux/void-packages/issues/34117

Description:
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.