[Bug 2097488] Re: [25.04 FEAT] [VS2214] KVM: Enable dynamic update of vfio-ap mediated devices for management applications - s390-tools part

[Frank Heimes]

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Title:
  [25.04 FEAT] [VS2214] KVM: Enable dynamic update of vfio-ap mediated
  devices for management applications - s390-tools part

Status in Ubuntu on IBM z Systems:
  Fix Released
Status in s390-tools package in Ubuntu:
  Fix Released
Status in s390-tools-signed package in Ubuntu:
  Fix Released

Bug description:
  Feature Description:

  The configuration of a vfio-ap matrix device can be updated while being in use, e.g. by a running KVM guest. However, presently this configuration change can't be performed using the higher level management interfaces and tools, like mdevctl and the libvirt nodedev API. Neither it is possible to observe the dynamic updates at the higher levels. This can lead to confusion and hard-to-debug problems in the field.
  We want to enable mdevctl and libvirt to be used to perform dynamic updates of vfio-ap matrix devices. To achieve this, it will be necessary to enable mdevctl to support dynamic updates in principle, but also requires support in the vfio-ap driver to support bulk updates in sysfs (of multiple APQNs in one operation), enhancements to the ap-check callout of s390-tools to exploit the vfio-ap specific sysfs interfaces and perform the actual update. Finally, the libvirt nodedev API must be extended to support a modify operation.

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