From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cornelia Huck Subject: Re: [RFC 00/19] KVM: s390/crypto/vfio: guest dedicated crypto adapters Date: Mon, 16 Oct 2017 12:05:14 +0200 Message-ID: <20171016120514.62145b4f.cohuck@redhat.com> References: <1507916344-3896-1-git-send-email-akrowiak@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1507916344-3896-1-git-send-email-akrowiak@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Archive: List-Post: To: Tony Krowiak Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, freude@de.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, borntraeger@de.ibm.com, kwankhede@nvidia.com, bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com, alex.williamson@redhat.com, pmorel@linux.vnet.ibm.com, alifm@linux.vnet.ibm.com, mjrosato@linux.vnet.ibm.com, qemu-s390x@nongnu.org, jjherne@linux.vnet.ibm.com, thuth@redhat.com, pasic@linux.vnet.ibm.com List-ID: On Fri, 13 Oct 2017 13:38:45 -0400 Tony Krowiak 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.