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

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Date:   Mon, 2 Jul 2018 15:53:30 +0200
From:   Halil Pasic <pasic@...ux.ibm.com>
To:     Tony Krowiak <akrowiak@...ux.vnet.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        cohuck@...hat.com, kwankhede@...dia.com,
        bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com,
        alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com,
        alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        Tony Krowiak <akrowiak@...ux.ibm.com>
Subject: Re: [PATCH v6 07/21] s390: vfio-ap: base implementation of VFIO AP
 device driver



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@...ux.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