linux-kernel - Re: [PATCH v3 14/14] tpm: Allow locality 2 to be set when initializing the TPM for Secure Launch

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Date:   Mon, 16 Aug 2021 10:18:10 -0400
From:   Ross Philipson <ross.philipson@...cle.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        iommu@...ts.linux-foundation.org, linux-integrity@...r.kernel.org,
        linux-doc@...r.kernel.org, dpsmith@...rtussolutions.com,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        luto@...capital.net, kanth.ghatraju@...cle.com,
        trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v3 14/14] tpm: Allow locality 2 to be set when
 initializing the TPM for Secure Launch

On 8/10/21 12:21 PM, Jarkko Sakkinen wrote:
> On Mon, Aug 09, 2021 at 12:38:56PM -0400, Ross Philipson wrote:
>> The Secure Launch MLE environment uses PCRs that are only accessible from
>> the DRTM locality 2. By default the TPM drivers always initialize the
>> locality to 0. When a Secure Launch is in progress, initialize the
>> locality to 2.
>>
>> Signed-off-by: Ross Philipson <ross.philipson@...cle.com>
>> ---
>>   drivers/char/tpm/tpm-chip.c | 13 +++++++++++--
>>   1 file changed, 11 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
>> index ddaeceb..48b9351 100644
>> --- a/drivers/char/tpm/tpm-chip.c
>> +++ b/drivers/char/tpm/tpm-chip.c
>> @@ -23,6 +23,7 @@
>>   #include <linux/major.h>
>>   #include <linux/tpm_eventlog.h>
>>   #include <linux/hw_random.h>
>> +#include <linux/slaunch.h>
>>   #include "tpm.h"
>>   
>>   DEFINE_IDR(dev_nums_idr);
>> @@ -34,12 +35,20 @@
>>   
>>   static int tpm_request_locality(struct tpm_chip *chip)
>>   {
>> -	int rc;
>> +	int rc, locality;
> 
>          int locality;
>          int rc;

Will do.

> 
>>   
>>   	if (!chip->ops->request_locality)
>>   		return 0;
>>   
>> -	rc = chip->ops->request_locality(chip, 0);
>> +	if (slaunch_get_flags() & SL_FLAG_ACTIVE) {
>> +		dev_dbg(&chip->dev, "setting TPM locality to 2 for MLE\n");
>> +		locality = 2;
>> +	} else {
>> +		dev_dbg(&chip->dev, "setting TPM locality to 0\n");
>> +		locality = 0;
>> +	}
> 
> Please, remove dev_dbg()'s.

Will do.

Thanks
Ross

> 
>> +
>> +	rc = chip->ops->request_locality(chip, locality);
>>   	if (rc < 0)
>>   		return rc;
>>   
>> -- 
>> 1.8.3.1
> 
> /Jarkko
>