linux-kernel - Re: [PATCH] tpm: Opt-in in disable PCR encryption on TPM2 chips

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Message-Id: <D5FJBKBSLIXR.3MRIPCQA5CSJD@kernel.org>
Date: Thu, 07 Nov 2024 02:54:08 +0200
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Jarkko Sakkinen" <jarkko@...nel.org>,
 <linux-integrity@...r.kernel.org>, "Jonathan Corbet" <corbet@....net>,
 "Peter Huewe" <peterhuewe@....de>, "Jason Gunthorpe" <jgg@...pe.ca>, "James
 Bottomley" <James.Bottomley@...senPartnership.com>
Cc: "Mimi Zohar" <zohar@...ux.ibm.com>, "Roberto Sassu"
 <roberto.sassu@...wei.com>, <linux-doc@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: Opt-in in disable PCR encryption on TPM2 chips

On Thu Nov 7, 2024 at 2:51 AM EET, Jarkko Sakkinen wrote:
> On Thu Nov 7, 2024 at 2:47 AM EET, Jarkko Sakkinen wrote:
> > From: Mimi Zohar <zohar@...ux.ibm.com>
> >
> > The initial encrypted HMAC session feature added TPM bus encryption to
> > various in-kernel TPM operations. This can cause performance bottlenecks
> > with IMA, as it heavily utilizes PCR extend operations.
> >
> > In order to address this performance issue, introduce disable_encrypt_pcrs
> > kernel command-line parameter to the TPM driver.
> >
> > Cc: James Bottomley <James.Bottomley@...senPartnership.com>

We also probably want this:

Cc: stable@...r.kernel.org # v6.10+

BR, Jarkko