From mboxrd@z Thu Jan 1 00:00:00 1970 From: Halil Pasic Subject: Re: [PATCH v6 07/21] s390: vfio-ap: base implementation of VFIO AP device driver Date: Mon, 2 Jul 2018 15:53:30 +0200 Message-ID: References: <1530306683-7270-1-git-send-email-akrowiak@linux.vnet.ibm.com> <1530306683-7270-8-git-send-email-akrowiak@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Cc: freude@de.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.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, jjherne@linux.vnet.ibm.com, thuth@redhat.com, pasic@linux.vnet.ibm.com, berrange@redhat.com, fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com, Tony Krowiak To: Tony Krowiak , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Return-path: In-Reply-To: <1530306683-7270-8-git-send-email-akrowiak@linux.vnet.ibm.com> Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On 06/29/2018 11:11 PM, Tony Krowiak wrote: > Introduces a new AP device driver. This device driver > is built on the VFIO mediated device framework. The framework > provides sysfs interfaces that facilitate passthrough > access by guests to devices installed on the linux host. > > The VFIO AP device driver will serve two purposes: > > 1. Provide the interfaces to reserve AP devices for exclusive > use by KVM guests. This is accomplished by unbinding the > devices to be reserved for guest usage from the default AP > device driver and binding them to the VFIO AP device driver. > > 2. Implements the functions, callbacks and sysfs attribute > interfaces required to create one or more VFIO mediated > devices each of which will be used to configure the AP > matrix for a guest and serve as a file descriptor > for facilitating communication between QEMU and the > VFIO AP device driver. > > When the VFIO AP device driver is initialized: > > * It registers with the AP bus for control of type 10 (CEX4 > and newer) AP queue devices. This limitation was imposed > due to: > > 1. A lack of access to older systems needed to test the > older AP device models; > > 2. A desire to keep the code as simple as possible; > > 3. Some older models are no longer supported by the kernel > and others are getting close to end of service. > > The probe and remove callbacks will be provided to support > the binding/unbinding of AP queue devices to/from the VFIO > AP device driver. > > * Creates a /sys/devices/vfio-ap/matrix device to hold > the APQNs of the AP devices bound to the VFIO > AP device driver and serves as the parent of the > mediated devices created for each guest. > > Signed-off-by: Tony Krowiak > --- > MAINTAINERS | 10 +++ > arch/s390/Kconfig | 11 +++ > drivers/s390/crypto/Makefile | 4 + > drivers/s390/crypto/vfio_ap_drv.c | 140 +++++++++++++++++++++++++++++++++ > drivers/s390/crypto/vfio_ap_private.h | 29 +++++++ > include/uapi/linux/vfio.h | 2 + > samples/bpf/bpf_load.c | 62 +++++++++++++++ You have probably touched the last one by accident. Regards, Halil