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SubjectRe: [PATCH v10 04/26] s390: vfio-ap: base implementation of VFIO AP device driver
On Wed, 12 Sep 2018 15:42:54 -0400
Tony Krowiak <akrowiak@linux.vnet.ibm.com> wrote:

> From: Tony Krowiak <akrowiak@linux.ibm.com>
>
> 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@linux.ibm.com>
> Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
> Tested-by: Michael Mueller <mimu@linux.ibm.com>
> Tested-by: Farhan Ali <alifm@linux.ibm.com>
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

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@redhat.com>

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