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

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Message-ID: <20250409184507.GLZ_bAM8LCPXKn9xU1@fat_crate.local>
Date: Wed, 9 Apr 2025 20:45:07 +0200
From: Borislav Petkov <bp@...en8.de>
To: Tom Lendacky <thomas.lendacky@....com>
Cc: Stefano Garzarella <sgarzare@...hat.com>,
	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, 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 11:07:49AM -0500, Tom Lendacky wrote:
> So the vTPM driver wouldn't change, just snp_init_platform_device():
> 
> 	if (snp_vmpl && platform_device_register(&tpm_svsm_device))

So this basically says that the SVSM is always sporting a vTPM emulation. But
you can build the cocont-svsm thing without it AFAICT.

So I'm guessing Stefano's suggestion here might make more sense:

https://lore.kernel.org/r/o2u7p3wb64lcc4sziunr274hyubkgmspzdjcvihbpzkw6mkvpo@sjq3vi4y2qfl

considering it all...

-- 
Regards/Gruss,
    Boris.

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