linux-kernel - Re: [PATCH v9 11/22] s390: vfio-ap: sysfs interfaces to configure domains

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Message-Id: <6727d228-c225-c7cc-2074-a5c69d233caa@linux.ibm.com>
Date:   Wed, 15 Aug 2018 13:00:38 -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 v9 11/22] s390: vfio-ap: sysfs interfaces to configure
 domains

On 08/15/2018 08:05 AM, Cornelia Huck wrote:
> On Mon, 13 Aug 2018 17:48:08 -0400
> Tony Krowiak <akrowiak@...ux.vnet.ibm.com> wrote:
>
>> From: Tony Krowiak <akrowiak@...ux.ibm.com>
>>
>> Introduces two new sysfs attributes for the VFIO mediated
>> matrix device for assigning AP domains to and unassigning
>> AP domains from a mediated matrix device. The IDs of the
>> AP domains assigned to the mediated matrix device will be
>> stored in an AP queue mask (AQM).
>>
>> The bits in the AQM, from most significant to least
>> significant bit, correspond to AP queue index (APQI) 0 to
>> 255 (note that an APQI is synonymous with with a domain ID).
>> On some systems, the maximum allowable domain number may be
>> less than 255 - depending upon the host's AP configuration -
>> and assignment may be rejected if the input domain ID exceeds
>> the limit.
>>
>> When a domain is assigned, the bit corresponding to the APQI
>> will be set in the AQM. Likewise, when a domain is unassigned,
>> the bit corresponding to the APQI will be cleared from the AQM.
>>
>> In order to successfully assign a domain, the APQNs derived from
>> the domain ID being assigned and the adapter numbers of all
>> adapters previously assigned:
>>
>> 1. Must be bound to the vfio_ap device driver.
>>
>> 2. Must not be assigned to any other mediated matrix device.
>>
>> If there are no adapters assigned to the mdev, then there must
>> be an AP queue bound to the vfio_ap device driver with an
>> APQN containing the domain ID (i.e., APQI), otherwise all
>> adapters subsequently assigned will fail because there will be no
>> AP queues bound with an APQN containing the APQI.
>>
>> Assigning or un-assigning an AP domain will also be rejected if
>> a guest using the mediated matrix device is running.
>>
>> The relevant sysfs structures are:
>>
>> /sys/devices/vfio_ap/matrix/
>> ...... [mdev_supported_types]
>> ......... [vfio_ap-passthrough]
>> ............ [devices]
>> ...............[$uuid]
>> .................. assign_domain
>> .................. unassign_domain
>>
>> To assign a domain to the $uuid mediated matrix device,
>> write the domain's ID to the assign_domain file. To
>> unassign a domain, write the domain's ID to the
>> unassign_domain file. The ID is specified using
>> conventional semantics: If it begins with 0x, the number
>> will be parsed as a hexadecimal (case insensitive) number;
>> if it begins with 0, it will be parsed as an octal number;
>> otherwise, it will be parsed as a decimal number.
>>
>> For example, to assign domain 173 (0xad) to the mediated matrix
>> device $uuid:
>>
>> 	echo 173 > assign_domain
>>
>> 	or
>>
>> 	echo 0255 > assign_domain
>>
>> 	or
>>
>> 	echo 0xad > assign_domain
>>
>> To unassign domain 173 (0xad):
>>
>> 	echo 173 > unassign_domain
>>
>> 	or
>>
>> 	echo 0255 > unassign_domain
>>
>> 	or
>>
>> 	echo 0xad > unassign_domain
>>
>> 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>
>> Tested-by: Pierre Morel <pmorel@...ux.ibm.com>
>> Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
>> ---
>>   drivers/s390/crypto/vfio_ap_ops.c |   88 ++++++++++++++++++++++++++++++++++++-
>>   1 files changed, 87 insertions(+), 1 deletions(-)
> Looks sane to me.

Sanity rules!

>