linux-kernel - Re: [PATCH v5 1/5] tpm_crb: implement driver compliant to CRB over FF-A

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Message-ID: <Z7b2bwjzWbYE_Qjc@kernel.org>
Date: Thu, 20 Feb 2025 11:31:27 +0200
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Stuart Yoder <stuart.yoder@....com>
Cc: linux-integrity@...r.kernel.org, peterhuewe@....de, jgg@...pe.ca,
	sudeep.holla@....com, rafael@...nel.org, lenb@...nel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/5] tpm_crb: implement driver compliant to CRB over
 FF-A

On Thu, Feb 20, 2025 at 11:28:58AM +0200, Jarkko Sakkinen wrote:
> On Wed, Feb 19, 2025 at 02:10:10PM -0600, Stuart Yoder wrote:
> > The Arm specification TPM Service CRB over FF-A specification
> > defines the FF-A messages to interact with a CRB-based TPM
> > implemented as an FF-A secure partition.
> > 
> > Spec URL:
> > https://developer.arm.com/documentation/den0138/latest/
> > 
> > This driver is probed when a TPM Secure Partition is
> > discovered by the FF-A subsystem. It exposes APIs
> > used by the TPM CRB driver to send notifications to
> > the TPM.
> > 
> > Acked-by: Sudeep Holla <sudeep.holla@....com>
> > Signed-off-by: Stuart Yoder <stuart.yoder@....com>
> 
> Cutting hairs now but as I cannot test this and this is 1/5:
> can this patch be run without 2/5-4/5?
> 
> The policy is that every patch should leave kernel tree to
> a state where it compiles and runs.

The root reason for this is that wrong ordered patch sets
commited to Git add difficulty to bisection in the long-term.

BR, Jarkko