linux-kernel - [PATCH 0/4] tpm: lazy flush for the session null key

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Message-ID: <20240915180448.2030115-1-jarkko@kernel.org>
Date: Sun, 15 Sep 2024 21:04:42 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: linux-integrity@...r.kernel.org
Cc: James.Bottomley@...senPartnership.com,
	roberto.sassu@...wei.com,
	mapengyu@...il.com,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Peter Huewe <peterhuewe@....de>,
	Jason Gunthorpe <jgg@...pe.ca>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 0/4] tpm: lazy flush for the session null key

There is no load and flush the null key for every transaction. It only
needs to be flushed when user space accesses TPM. This postpones the
flush up to that point.

The goal is to take the first step addressing [1]. Other performance
improvements are needed too but this is the most obvious one and
easiest to address.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=219229

Jarkko Sakkinen (4):
  tpm: remove file header documentation from tpm2-sessions.c
  tpm: address tpm2_create_null_primary() return value
  tpm: address tpm2_create_primary() failure
  tpm: flush the session null key only when required

 drivers/char/tpm/tpm-chip.c       |  13 ++++
 drivers/char/tpm/tpm-dev-common.c |   7 ++
 drivers/char/tpm/tpm-interface.c  |   9 ++-
 drivers/char/tpm/tpm2-cmd.c       |   3 +
 drivers/char/tpm/tpm2-sessions.c  | 115 ++++++++++--------------------
 include/linux/tpm.h               |   2 +
 6 files changed, 68 insertions(+), 81 deletions(-)

-- 
2.46.0