linux-kernel - Re: [PATCH 1/3] tpm: Disable TCG_TPM2

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Message-ID: <17dc838120b56ce342c34611596c7b46dcd9ab5a.camel@HansenPartnership.com>
Date: Tue, 21 May 2024 08:33:14 -0400
From: James Bottomley <James.Bottomley@...senPartnership.com>
To: Jarkko Sakkinen <jarkko@...nel.org>, Vitor Soares <ivitro@...il.com>, 
	linux-integrity@...r.kernel.org
Cc: keyrings@...r.kernel.org, Peter Huewe <peterhuewe@....de>, Jason
 Gunthorpe <jgg@...pe.ca>, Mimi Zohar <zohar@...ux.ibm.com>, David Howells
 <dhowells@...hat.com>, Paul Moore <paul@...l-moore.com>, James Morris
 <jmorris@...ei.org>, "Serge E. Hallyn" <serge@...lyn.com>, 
 linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 1/3] tpm: Disable TCG_TPM2_HMAC by default

On Tue, 2024-05-21 at 10:10 +0300, Jarkko Sakkinen wrote:
> This benchmark could be done in user space using /dev/tpm0.

Let's actually try that.  If you have the ibmtss installed, the command
to time primary key generation from userspace on your tpm is

time tsscreateprimary -hi n -ecc nistp256


And just for chuckles and grins, try it in the owner hierarchy as well
(sometimes slow TPMs cache this)

time tsscreateprimary -hi o -ecc nistp256

And if you have tpm2 tools, the above commands should be:

time tpm2_createprimary -C n -G ecc256
time tpm2_createprimary -C o -G ecc256

James