linux-kernel - [RFC PATCH 0/3] tpm: add send_recv() op and use it in tpm_ftpm_tee and tpm

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Message-ID: <20250311100130.42169-1-sgarzare@redhat.com>
Date: Tue, 11 Mar 2025 11:01:27 +0100
From: Stefano Garzarella <sgarzare@...hat.com>
To: Jarkko Sakkinen <jarkko@...nel.org>
Cc: linux-integrity@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Peter Huewe <peterhuewe@....de>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Stefano Garzarella <sgarzare@...hat.com>
Subject: [RFC PATCH 0/3] tpm: add send_recv() op and use it in tpm_ftpm_tee and tpm_svsm drivers

This series is a follow-up to the discussion we had about whether or not
to add send_recv() op in tpm_class_ops[1].

Some devices do not support interrupts and provide a single operation
to send the command and receive the response on the same buffer.
In order to simplify these drivers and avoid temporary buffers to be
used between the .send() and .recv() callbacks, introduce a new callback
send_recv(). This was suggested by Jason Gunthorpe while reviewing
the new SVSM vTPM driver, but the same callback can be used also for the
fTPM driver to simplify it a bit (second patch of this series).
I only successfully compiled fTPM, but I don't know how to test, if anyone
can test or suggest how to do it, I would be grateful.

This series is based on "[PATCH v3 0/4] Enlightened vTPM support for SVSM
on SEV-SNP" [2] (actually only the last patch in this series).

[1] https://lore.kernel.org/linux-integrity/Z8sfiDEhsG6RATiQ@kernel.org/
[2] https://lore.kernel.org/linux-integrity/20250311094225.35129-1-sgarzare@redhat.com/

Stefano Garzarella (3):
  tpm: add send_recv() op in tpm_class_ops
  tpm/tpm_ftpm_tee: use send_recv() op
  tpm/tpm_svsm: use send_recv() op

 drivers/char/tpm/tpm_ftpm_tee.h  |  4 --
 include/linux/tpm.h              |  2 +
 drivers/char/tpm/tpm-interface.c |  7 +++
 drivers/char/tpm/tpm_ftpm_tee.c  | 86 ++++++++------------------------
 drivers/char/tpm/tpm_svsm.c      | 46 ++++-------------
 5 files changed, 39 insertions(+), 106 deletions(-)

base-commit: f2cb83b7f8c58952b424a83bf86680f1263ad417
-- 
2.48.1