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

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Message-Id: <8bc5f207-f913-825c-f9fc-0a2c7fd280aa@linux.ibm.com>
Date:   Wed, 22 Aug 2018 13:03:05 +0200
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     Cornelia Huck <cohuck@...hat.com>,
        Halil Pasic <pasic@...ux.ibm.com>
Cc:     Tony Krowiak <akrowiak@...ux.ibm.com>,
        Tony Krowiak <akrowiak@...ux.vnet.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        kwankhede@...dia.com, bjsdjshi@...ux.vnet.ibm.com,
        pbonzini@...hat.com, alex.williamson@...hat.com,
        pmorel@...ux.vnet.ibm.com, alifm@...ux.vnet.ibm.com,
        mjrosato@...ux.vnet.ibm.com, jjherne@...ux.vnet.ibm.com,
        thuth@...hat.com, pasic@...ux.vnet.ibm.com, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        frankja@...ux.ibm.com
Subject: Re: [PATCH v9 12/22] s390: vfio-ap: sysfs interfaces to configure
 control domains

On 22/08/2018 11:42, Cornelia Huck wrote:
> On Wed, 22 Aug 2018 01:18:20 +0200
> Halil Pasic <pasic@...ux.ibm.com> wrote:
>
>> On 08/21/2018 07:07 PM, Tony Krowiak wrote:
>>> This convention has been enforced by the kernel since v1. This is also
>>> enforced by both the LPAR as well as in z/VM. The following is from the
>>> PR/SM Planning Guide:
>>>
>>> Control Domain
>>> A logical partition's control domains are those cryptographic domains for which remote secure
>>> administration functions can be established and administered from this logical partition. This
>>> logical partition’s control domains must include its usage domains. For each index selected in the
>>> usage domain index list, you must select the same index in the control domain index list
>>>    
> 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.

Regards,
Pierre


-- 
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany