linux-kernel - Re: [PATCH v2 5/8] virt: efi_secret: Transition to the faux device interface

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Message-ID: <Z9rDely6YxIQZTrK@bogus>
Date: Wed, 19 Mar 2025 13:15:38 +0000
From: Sudeep Holla <sudeep.holla@....com>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: linux-kernel@...r.kernel.org, Sudeep Holla <sudeep.holla@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-efi@...r.kernel.org
Subject: Re: [PATCH v2 5/8] virt: efi_secret: Transition to the faux device
 interface

On Tue, Mar 18, 2025 at 06:10:41PM +0100, Ard Biesheuvel wrote:
> On Tue, 18 Mar 2025 at 18:02, Sudeep Holla <sudeep.holla@....com> wrote:
> >
> > The EFI secret area driver does not require the creation of a platform
> > device. Originally, this approach was chosen for simplicity when the
> > driver was first implemented.
> >
> > With the introduction of the lightweight faux device interface, we now
> > have a more appropriate alternative. Migrate the driver to utilize the
> > faux bus, given that the platform device it previously created was not
> > a real one anyway. This will simplify the code, reducing its footprint
> > while maintaining functionality.
> >
> > Cc: Ard Biesheuvel <ardb@...nel.org>
> > Cc: linux-efi@...r.kernel.org
> > Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> 
> So how is module autoload supposed to work with this driver?
> 

IIUC, you are right. It doesn't work. I got carried away how efi_pstore was
autoloaded in Ubuntu even without alias or platform/faux device creation. I
don't know how yet but that works. This modules doesn't.

So we may have to retain platform device/driver for autoloading reasons ?

-- 
Regards,
Sudeep