linux-kernel - Re: [RFC 00/19] KVM: s390/crypto/vfio: guest dedicated crypto adapters

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Message-Id: <ff3f4234-43b6-7a2f-9198-13477141bffd@linux.vnet.ibm.com>
Date:   Mon, 16 Oct 2017 12:27:52 -0400
From:   Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
To:     Cornelia Huck <cohuck@...hat.com>
Cc:     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, qemu-s390x@...gnu.org,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com
Subject: Re: [RFC 00/19] KVM: s390/crypto/vfio: guest dedicated crypto
 adapters

On 10/16/2017 06:05 AM, Cornelia Huck wrote:
> On Fri, 13 Oct 2017 13:38:45 -0400
> Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:
>
>> Overview:
>> --------
>> An adjunct processor (AP) facility is an IBM Z cryptographic facility. The
>> AP facility is comprised of three AP instructions and from 1 to 256 AP
>> adapter cards. The design takes advantage of the interpretive execution mode
>> provided by the SIE architecture. With interpretive execution mode, the AP
>> instructions executed on the guest are interpreted by the hardware. This
>> allows guests direct access to AP adapter cards. The first goal of this
>> patch series is to provide direct access by a KVM guest to an AP as a
>> pass-through device. The second goal is to provide administrators with the
>> means to configure KVM guests to grant direct access to AP facilities
>> assigned to the LPAR in which the host linux system is running.
>>
>> To facilitate the comprehension of the design, let's present an overview of
>> the AP architecture.
> I have not yet looked at the patches (and I'm not sure whether I'll be
> able to do so until after the KVM Forum), but I think this also needs
> some explanation under Documentation/, so people can still make sense
> of it in the future.
That makes sense, I will create a document.
>