linux-kernel - Re: [PATCH] tpm: increase timeout for kselftests

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Message-ID: <4832efdf-f2a7-7b0c-4477-088772c962c0@infineon.com>
Date:   Mon, 20 Jun 2022 16:45:45 +0200
From:   Stefan Mahnke-Hartmann <stefan.mahnke-hartmann@...ineon.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>
CC:     Johannes Holland <johannes.holland@...ineon.com>,
        <linux-integrity@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <peterhuewe@....de>, <jgg@...pe.ca>,
        <stefan.mahnke-hartmann@...ineon.com>
Subject: Re: [PATCH] tpm: increase timeout for kselftests



On 23.05.22 21:59, Jarkko Sakkinen wrote:
> On Fri, May 20, 2022 at 03:28:42PM +0200, Stefan Mahnke-Hartmann wrote:
>>
>> On 11.05.22 17:14, Jarkko Sakkinen wrote:
>>> On Tue, May 10, 2022 at 01:16:08PM +0200, Johannes Holland wrote:
>>>> Due to CreatePrimary commands which need to create RSA keys of
>>>> increasing size, the timeout value need to be raised, as well.
>>>> Default is 300s.
>>>>
>>>> Signed-off-by: Johannes Holland <johannes.holland@...ineon.com>
>>>> ---
>>>> A timeout of anything below 600s still lead to occasional timeouts for
>>>> me. Therefore, I propose 600s as a new value. 
>>>>
>>>>  tools/testing/selftests/tpm2/settings | 2 ++
>>>>  1 file changed, 2 insertions(+)
>>>>  create mode 100644 tools/testing/selftests/tpm2/settings
>>>>
>>>> diff --git a/tools/testing/selftests/tpm2/settings b/tools/testing/selftests/tpm2/settings
>>>> new file mode 100644
>>>> index 000000000000..919bc3803f03
>>>> --- /dev/null
>>>> +++ b/tools/testing/selftests/tpm2/settings
>>>> @@ -0,0 +1,2 @@
>>>> +timeout=600
>>>> +
>>>> -- 
>>>> 2.34.1
>>>>
>>> Could cope but I did not get why it needs to be raised.
>> The TPM2 SpaceTest testsuite currently creates 8 primary RSA 2k keys + 1 for
>> setup. Generating a RSA2k key can take up to ~1-2 minutes on some of our TPMs.
>> => 2x9 = 18 minutes. In the kernel we even define a duration timeout for rsa2k
>> keygen of 5 min per key! (TPM2_DURATION_LONG_LONG = 300000) => up to 45 minutes
>> would be "acceptable".
>>
>> However since the average key generation time is much faster, a value of ~10
>> minutes should be fine enough.
>>
>> The reason why you did not experience this yet on your test system is either
>> because PTT TPMs are faster in that respect and/or some TPMs implement pre-gen
>> mechanisms for key generation, (or just plain luck)
>>
>> BR, Stefan
>>
>>> BR, Jarkko
> I think this is ok.
>
>
> Acked-by: Jarkko Sakkinen <jarkko@...nel.org>
>
> BR, Jarkko
>
Hi Jarkko,
 
Just curious. I can't see this patch was added to linux-next. Was I
expected to do something more to it?
 
Kind regards
Stefan