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Goncalves" To: Steve McIntyre <93sam@debian.org> Cc: Prashant Singh , Ard Biesheuvel , Jeremy Kerr , linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, Jonathan Corbet , linux-doc@vger.kernel.org, Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , linux-rt-devel@lists.linux.dev Subject: Re: [PATCH v2] efivarfs: add nostatfs mount option to skip QueryVariableInfo() Message-ID: References: <20260919044124.8268-1-singhpra@juniper.net> <20260924111913.GN3447081@tack.einval.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260924111913.GN3447081@tack.einval.com> X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 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@debian.org > > ---end quoted text---