linux-kernel - Re: [PATCH v2] tpm_crb: Add idle support for the Arm FF-A start method

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Message-ID: <aP_QuU3QMAYl4yoG@kernel.org>
Date: Mon, 27 Oct 2025 22:06:17 +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, Prachotan.Bathi@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] tpm_crb: Add idle support for the Arm FF-A start
 method

On Fri, Oct 24, 2025 at 12:42:00PM -0500, Stuart Yoder wrote:
> According to the CRB over FF-A specification [1], a TPM that implements
> the ABI must comply with the TCG PTP specification. This requires support
> for the Idle and Ready states.
> 
> This patch implements CRB control area requests for goIdle and
> cmdReady on FF-A based TPMs.
> 
> The FF-A message used to notify the TPM of CRB updates includes a
> locality parameter, which provides a hint to the TPM about which
> locality modified the CRB.  This patch adds a locality parameter
> to __crb_go_idle() and __crb_cmd_ready() to support this.
> 
> [1] https://developer.arm.com/documentation/den0138/latest/
> 
> Signed-off-by: Stuart Yoder <stuart.yoder@....com>

A version of this went already to rc2.

BR, Jarkko