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Subject: Re: [PATCH v6 07/21] s390: vfio-ap: base implementation of VFIO AP
 device driver
To:     Tony Krowiak <akrowiak@linux.vnet.ibm.com>,
        linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org
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 <akrowiak@linux.ibm.com>
References: <1530306683-7270-1-git-send-email-akrowiak@linux.vnet.ibm.com>
 <1530306683-7270-8-git-send-email-akrowiak@linux.vnet.ibm.com>
From:   Halil Pasic <pasic@linux.ibm.com>
Date:   Mon, 2 Jul 2018 15:53:30 +0200
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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@linux.ibm.com>
> ---
>   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