On Wed, 12 Sep 2018 15:42:54 -0400 Tony Krowiak <akrowiak@xxxxxxxxxxxxxxxxxx> wrote: > From: Tony Krowiak <akrowiak@xxxxxxxxxxxxx> > > 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 zcrypt > 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 desire to keep the code as simple as possible; > > 2. 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 matrix device, /sys/devices/vfio_ap/matrix, > to serve as the parent of the mediated devices created, one > for each guest, and to hold the APQNs of the AP devices bound to > the VFIO AP device driver. > > Signed-off-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx> > Reviewed-by: Halil Pasic <pasic@xxxxxxxxxxxxx> > Tested-by: Michael Mueller <mimu@xxxxxxxxxxxxx> > Tested-by: Farhan Ali <alifm@xxxxxxxxxxxxx> > Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> Christian's S-o-b looks a bit odd here; OTOH, it's probably him anyway who will queue the patches in the end :) > --- > MAINTAINERS | 10 +++ > arch/s390/Kconfig | 11 +++ > drivers/iommu/Kconfig | 8 ++ > drivers/s390/crypto/Makefile | 4 + > drivers/s390/crypto/vfio_ap_drv.c | 134 +++++++++++++++++++++++++++++++++ > drivers/s390/crypto/vfio_ap_private.h | 34 ++++++++ > 6 files changed, 201 insertions(+), 0 deletions(-) > create mode 100644 drivers/s390/crypto/vfio_ap_drv.c > create mode 100644 drivers/s390/crypto/vfio_ap_private.h Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
