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Introduces two new sysfs attributes for the VFIO mediated matrix device for assigning AP adapters to and unassigning AP adapters from a mediated matrix device. The IDs of the AP adapters assigned to the mediated matrix device will be stored in an AP mask (APM). The bits in the APM, from most significant to least significant bit, correspond to AP adapter IDs (APID) 0 to 255. On some systems, the maximum allowable adapter number may be less than 255 - depending upon the host's AP configuration - and assignment may be rejected if the input adapter ID exceeds the limit. When an adapter is assigned, the bit corresponding to the APID will be set in the APM. Likewise, when an adapter is unassigned, the bit corresponding to the APID will be cleared from the APM. In order to successfully assign an adapter, the APQNs derived from the adapter ID being assigned and the queue indexes of all domains 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 domains assigned to the mdev, then there must be an AP queue bound to the vfio_ap device driver with an APQN containing the APID, otherwise all domains subsequently assigned will fail because there will be no AP queues bound with an APQN containing the adapter ID. Assigning or un-assigning an AP adapter will 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_adapter .................. unassign_adapter To assign an adapter to the $uuid mediated matrix device's APM, write the APID to the assign_adapter file. To unassign an adapter, write the APID to the unassign_adapter file. The APID is specified using conventional semantics: If it begins with 0x the number will be parsed as a hexadecimal number; if it begins with a 0 the number will be parsed as an octal number; otherwise, it will be parsed as a decimal number. For example, to assign adapter 173 (0xad) to the mediated matrix device $uuid: echo 173 > assign_adapter or echo 0xad > assign_adapter or echo 0255 > assign_adapter To unassign adapter 173 (0xad): echo 173 > unassign_adapter or echo 0xad > unassign_adapter or echo 0255 > unassign_adapter Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com> Reviewed-by: Halil Pasic <pasic@linux.ibm.com> Tested-by: Michael Mueller <mimu@linux.ibm.com> Tested-by: Farhan Ali <alifm@linux.ibm.com> Tested-by: Pierre Morel <pmorel@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Message-Id: <20180925231641.4954-7-akrowiak@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.