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

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Date: Wed, 22 May 2024 14:17:39 +0100
From: Vitor Soares <ivitro@...il.com>
To: Jarkko Sakkinen <jarkko@...nel.org>, James Bottomley
	 <James.Bottomley@...senPartnership.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 Wed, 2024-05-22 at 15:01 +0300, Jarkko Sakkinen wrote:
> On Wed May 22, 2024 at 11:18 AM EEST, Vitor Soares wrote:
> > On Tue, 2024-05-21 at 08:33 -0400, James Bottomley wrote:
> > > 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
> > > 
> > > 
> > 
> > Testing on an arm64 platform I get the following results.
> 
> OK, appreciate these results. I try to get mine this week, if I can
> allocate some bandwidth but latest early next week. The Intel CPU
> I'll be testing is Intel Celeron J4025:
> 
> https://www.intel.com/content/www/us/en/products/sku/197307/intel-celeron-processor-j4025-4m-cache-up-to-2-90-ghz/specifications.html
> 
> So if things work reasonably fast with this, then I think we can
> enable the feature at least on X86_64 by default, and make it
> opt-in for other arch's.
> 
> I sent already this patch but holding with PR up until rc1 is
> out so that there is some window to act:
> 
> https://lore.kernel.org/linux-integrity/20240521130921.15028-1-jarkko@kernel.org/
> 
> If I need to send an updated patch ("default X86_64") and rip
> transcrip from below results.
> 
> But to do that correctly I'd need to know at least:
> 
> 1. What is the aarch64 platform you are using?

I was testing this on the Toradex Verdin iMX8MM SoM.

> 2. What kind of TPM you are using and how is it connect?

TPM device is the ATTPM20P connect through the SPI at speed of 36 MHz.
The bus is shared with a CAN controller (MCP251xFD), so both mues work together.

The dts looks like:
tpm1: tpm@1 {
        compatible = "atmel,attpm20p", "tcg,tpm_tis-spi";
        interrupts-extended = <&gpio1 7 IRQ_TYPE_LEVEL_LOW>;
        pinctrl-0 = <&pinctrl_can2_int>;
        pinctrl-names = "default";
        reg = <1>;
        spi-max-frequency = <36000000>;
};

Regards,
Vitor Soares

> 
> Obviously if I make this decision, I'll put you as "Reported-by".
> 
>