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Re: [qemu-s390x] [RFC 00/19] KVM: s390/crypto/vfio: guest dedicated cryp

From: Cornelia Huck
Subject: Re: [qemu-s390x] [RFC 00/19] KVM: s390/crypto/vfio: guest dedicated crypto adapters
Date: Mon, 16 Oct 2017 12:05:14 +0200

On Fri, 13 Oct 2017 13:38:45 -0400
Tony Krowiak <address@hidden> 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.

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