Re: [PATCH v9 12/22] s390: vfio-ap: sysfs interfaces to configure control domains

[Christian Borntraeger]

On 08/22/2018 01:03 PM, Pierre Morel wrote:
>> That's interesting.
>>
>>> IMHO this quote is quite a half-full half-empty cup one:
>>> * it mandates the set of usage domains is a subset of the set
>>> of the control domains, but
>>> * it speaks of independent controls, namely about the 'usage domain index'
>>> and the 'control domain index list' and makes the enforcement of the rule
>>> a job of the administrator (instead of codifying it in the controls).
>> I'm wondering if a configuration with a usage domain that is not also a
>> control domain is rejected outright? Anybody tried that? :)
> 
> Yes, and no it is not.
> We can use a queue (usage domain) to a AP card for SHA-512 or RSA without
> having to define the queue as a control domain.

Huh? My HMC allows to add a domain as
- control only domain
- control and usage domain.

But I am not able to configure a usage-only domain for my LPAR. That seems to match
the current code, no?