Re: [PATCH v6 07/21] s390: vfio-ap: base implementation of VFIO AP device driver

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On 07/02/2018 09:53 AM, Halil Pasic wrote:


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.

I'll have to figure out what happened here.



Regards,
Halil


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