linux-kernel - Re: [PATCH v6 4/4] x86/sev: register tpm-svsm platform device

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Message-ID: <20250409113154.GGZ_ZaqgfRrrMij_Zm@fat_crate.local>
Date: Wed, 9 Apr 2025 13:31:54 +0200
From: Borislav Petkov <bp@...en8.de>
To: Stefano Garzarella <sgarzare@...hat.com>
Cc: Jarkko Sakkinen <jarkko@...nel.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>,
	"H. Peter Anvin" <hpa@...or.com>, linux-coco@...ts.linux.dev,
	linux-integrity@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	x86@...nel.org, Tom Lendacky <thomas.lendacky@....com>,
	Joerg Roedel <jroedel@...e.de>,
	Dionna Glaze <dionnaglaze@...gle.com>,
	Claudio Carvalho <cclaudio@...ux.ibm.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	linux-kernel@...r.kernel.org, Dov Murik <dovmurik@...ux.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v6 4/4] x86/sev: register tpm-svsm platform device

On Wed, Apr 09, 2025 at 12:43:01PM +0200, Stefano Garzarella wrote:
> Sorry, maybe I missed something.
> 
> tpm_svsm.c registers the driver with module_platform_driver_probe().
> 
> Someone (the platform I guess) has to register the device by calling
> platform_device_register(), as we already do for example for
> sev_guest.

Maybe that platform device thing is the wrong approach. Why does the core code
need to register some dummy platform device in the first place? Why can't
drivers/char/tpm/tpm_svsm.c probe and init without it?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette