linux-kernel - Re: [PATCH v2] tpm_ffa_crb: access tpm service over FF-A direct message request v2

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Message-ID: <Z_m2qMpcoaoVEWxu@kernel.org>
Date: Sat, 12 Apr 2025 03:41:12 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Stefano Garzarella <sgarzare@...hat.com>
Cc: Sudeep Holla <sudeep.holla@....com>, Yeoreum Yun <yeoreum.yun@....com>,
	peterhuewe@....de, jgg@...pe.ca, stuart.yoder@....com,
	linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] tpm_ffa_crb: access tpm service over FF-A direct
 message request v2

On Fri, Apr 11, 2025 at 01:04:32PM +0200, Stefano Garzarella wrote:
> On Fri, Apr 11, 2025 at 11:43:24AM +0100, Sudeep Holla wrote:
> > On Fri, Apr 11, 2025 at 01:37:31PM +0300, Jarkko Sakkinen wrote:
> > > On Fri, Apr 11, 2025 at 10:08:56AM +0100, Yeoreum Yun wrote:
> > > > For secure partition with multi service, tpm_ffa_crb can access tpm
> > > > service with direct message request v2 interface according to chapter 3.3,
> > > > TPM Service Command Response Buffer Interface Over FF-A specification [0].
> > > >
> > > > This patch reflects this spec to access tpm service over
> > > > FF-A direct message request v2 ABI.
> > > >
> > > > Link: https://developer.arm.com/documentation/den0138/latest/ [0]
> > > 
> > > Sorry, did not notice in the first round:
> > > 
> > > 1. Does not have "[0]" postfix.
> > > 2. Only for lore links:
> > >    https://www.kernel.org/doc/html/v6.12/maintainer/configure-git.html#creating-commit-links-to-lore-kernel-org
> > > 
> > 
> > I was about to comment on the presence of link itself but left it to
> > the maintainer. It was part of the first commit log from Stuart. If it
> > is so important that it requires mention in each commit, it better me
> > made part of the file itself to avoid having to mention again and again.
> > Just my opinion, I leave it to the maintainers.
> 
> I agree on this.
> Also, are these links assured to be stable? Could we just mention the title
> and version?

I don't actually care in the end of the day if it is valid forever as
long as it is valid for "reasonable amount of time".

> 
> e.g. "TPM Service Command Response Buffer Interface Over FF-A"
>      Document version: v1.0 BET
> 
> Thanks,
> Stefano
> 

BR, Jarkko