linux-kernel - Re: [PATCH v2 1/4] s390/pkey: Use -ENODEV instead of -EOPNOTSUPP

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Date:   Wed, 12 Jun 2019 12:41:19 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Harald Freudenberger <freude@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Cc:     linux-s390@...r.kernel.org, linux-crypto@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Cornelia Huck <cohuck@...hat.com>
Subject: Re: [PATCH v2 1/4] s390/pkey: Use -ENODEV instead of -EOPNOTSUPP

On 12.06.19 12:39, Harald Freudenberger wrote:
> On 12.06.19 12:22, David Hildenbrand wrote:
>> systemd-modules-load.service automatically tries to load the pkey module
>> on systems that have MSA.
>>
>> Pkey also requires the MSA3 facility and a bunch of subfunctions.
>> Failing with -EOPNOTSUPP makes "systemd-modules-load.service" fail on
>> any system that does not have all needed subfunctions. For example,
>> when running under QEMU TCG (but also on systems where protected keys
>> are disabled via the HMC).
>>
>> Let's use -ENODEV, so systemd-modules-load.service properly ignores
>> failing to load the pkey module because of missing HW functionality.
>>
>> Reviewed-by: Cornelia Huck <cohuck@...hat.com>
>> Signed-off-by: David Hildenbrand <david@...hat.com>
>> ---
>>  drivers/s390/crypto/pkey_api.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/s390/crypto/pkey_api.c b/drivers/s390/crypto/pkey_api.c
>> index 45eb0c14b880..ddfcefb47284 100644
>> --- a/drivers/s390/crypto/pkey_api.c
>> +++ b/drivers/s390/crypto/pkey_api.c
>> @@ -1695,15 +1695,15 @@ static int __init pkey_init(void)
>>  	 * are able to work with protected keys.
>>  	 */
>>  	if (!cpacf_query(CPACF_PCKMO, &pckmo_functions))
>> -		return -EOPNOTSUPP;
>> +		return -ENODEV;
>>  
>>  	/* check for kmc instructions available */
>>  	if (!cpacf_query(CPACF_KMC, &kmc_functions))
>> -		return -EOPNOTSUPP;
>> +		return -ENODEV;
>>  	if (!cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_128) ||
>>  	    !cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_192) ||
>>  	    !cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_256))
>> -		return -EOPNOTSUPP;
>> +		return -ENODEV;
>>  
>>  	pkey_debug_init();
>>  
> You missed one match in this file. Function pkey_clr2protkey()
> also does a cpacf_test_func() and may return -EOPNOTSUPP.
> I checked the call chain, it's save to change the returncode there also.

That's unrelated to module loading (if I am not wrong), shall we still
include this change here?

Thanks!

> If done, Thanks and add my
> reviewed-by: Harald Freudenberger <freude@...ux.ibm.com>
> 


-- 

Thanks,

David / dhildenb