linux-kernel - Re: [PATCH v10 04/26] s390: vfio-ap: base implementation of VFIO AP device driver

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Message-Id: <528f4faa-6c0f-ec48-5f8d-aaacc060871f@linux.ibm.com>
Date:   Thu, 20 Sep 2018 11:53:19 -0400
From:   Tony Krowiak <akrowiak@...ux.ibm.com>
To:     Cornelia Huck <cohuck@...hat.com>,
        Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.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,
        frankja@...ux.ibm.com
Subject: Re: [PATCH v10 04/26] s390: vfio-ap: base implementation of VFIO AP
 device driver

On 09/20/2018 11:31 AM, Cornelia Huck wrote:
> On Wed, 12 Sep 2018 15:42:54 -0400
> Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:
>
>> From: Tony Krowiak <akrowiak@...ux.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@...ux.ibm.com>
>> Reviewed-by: Halil Pasic <pasic@...ux.ibm.com>
>> Tested-by: Michael Mueller <mimu@...ux.ibm.com>
>> Tested-by: Farhan Ali <alifm@...ux.ibm.com>
>> Signed-off-by: Christian Borntraeger <borntraeger@...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 :)

It went in there when Christian submitted the patch series in my absence 
back in
July while I was on vacation. I wasn't aware it was in the actual commit 
message,
so it never got removed. I'll remove it if a v11 needs to be submitted.

>
>> ---
>>   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@...hat.com>
>