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 <akrowiak@xxxxxxxxxxxxx>
---
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
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