Re: [PATCH v2] efivarfs: add nostatfs mount option to skip QueryVariableInfo()

[Luis Claudio R. Goncalves]

On Thu, Sep 24, 2026 at 12:19:23PM +0100, Steve McIntyre wrote:
> Hey all,
> 
> On Thu, Sep 24, 2026 at 08:05:34AM -0300, Luis Claudio R. Goncalves wrote:
> >On Fri, Sep 18, 2026 at 09:41:24PM -0700, Prashant Singh wrote:
> >
> >I tested the patch and was quite satisfied with the results, but upon a
> >comment from colleagues I ran a few more tests and noticed (confirmed their
> >hunch) that fwupd complains about not being able to get the free space in
> >efivars:
> >
> >  # fwupdmgr get-devices | grep efivars
> >  │     Update Error:       getting efivars free space is not supported
> >  │ │   Update Error:       getting efivars free space is not supported
> >  ...
> >
> >I was not able to establish whether that would prevent specific operations
> >due to the HW I had available for such test.
> 
> fwupd will refuse to do some of its updates if it can't read the
> efivars free space, in particular updates of the secure boot keyrings
> like KEK/DB/DBX.

In this case, corroborating with Sashiko findings, it is necessary to have
a way to override that default in kernels with PREEMPT_RT enabled. To be used
where this is required for firmware updates.

Luis

> -- 
> Steve McIntyre, Cambridge, UK.                                93sam@xxxxxxxxxx
> 
> 
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