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

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Message-ID: <Z9rVIqcIguqsoMw5@bogus>
Date: Wed, 19 Mar 2025 14:30:58 +0000
From: Sudeep Holla <sudeep.holla@....com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Ard Biesheuvel <ardb@...nel.org>, linux-kernel@...r.kernel.org,
	Sudeep Holla <sudeep.holla@....com>, linux-efi@...r.kernel.org
Subject: Re: [PATCH v2 5/8] virt: efi_secret: Transition to the faux device
 interface

On Wed, Mar 19, 2025 at 07:24:53AM -0700, Greg Kroah-Hartman wrote:
> On Wed, Mar 19, 2025 at 01:15:38PM +0000, Sudeep Holla wrote:
> > 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 ?
> 
> If that's required, yes.

Thanks for confirming. I will drop this and see if autoloading is needed
in any other modules as well.

-- 
Regards,
Sudeep