Description of problem:

Virt-handler deletes any pre-configured mediated device even if nothing is configured under spec.configuration.mediatedDevicesConfiguration.

On a default installation of OCP Virt 4.12, the virt-handler pod is deleting any mdev device that is created on the system.

This is reproducible with an empty permittedHostDevices configuration:
permittedHostDevices: {}
and with the following config where externalResourceProvider=true is explicitly set for the mdev device.

permittedHostDevices:
mediatedDevices:

• externalResourceProvider: true
  mdevNameSelector: NVIDIA A10-24Q
  resourceName: nvidia.com/NVIDIA_A10-24Q

Consider the following pre-configured mdev (vGPU) devices:

[core@cnt-a100-bm ~]$ ls -ltr /sys/bus/mdev/devices/

total 0

lrwxrwxrwx. 1 root root 0 Feb 8 18:46 63b0b313-a62f-4475-b274-c26dd7defbcd -> ../../../devices/pci0000:3a/0000:3a:00.0/0000:3b:00.4/63b0b313-a62f-4475-b274-c26dd7defbcd

lrwxrwxrwx. 1 root root 0 Feb 8 18:46 203276d5-ac06-4585-baf3-ff16e119d634 -> ../../../devices/pci0000:3a/0000:3a:00.0/0000:3b:00.5/203276d5-ac06-4585-baf3-ff16e119d634

lrwxrwxrwx. 1 root root 0 Feb 8 18:46 f4fd3e66-f062-45dd-8ec0-39a7a2201490 -> ../../../devices/pci0000:d7/0000:d7:00.0/0000:d8:00.5/f4fd3e66-f062-45dd-8ec0-39a7a2201490

lrwxrwxrwx. 1 root root 0 Feb 8 18:46 2bd56759-c812-4784-9aea-3d9df23d15d3 -> ../../../devices/pci0000:d7/0000:d7:00.0/0000:d8:00.4/2bd56759-c812-4784-9aea-3d9df23d15d3

The devices get deleted by virt-handler shortly after:

[core@cnt-a100-bm ~]$ ls -ltr /sys/bus/mdev/devices/
total 0

[core@cnt-a100-bm ~]$ oc logs -n openshift-cnv virt-handler-fp426
. . .

{"component":"virt-handler","level":"info","msg":"resyncing virt-launcher domains","pos":"cache.go:385","timestamp":"2023-02-08T18:44:44.363329Z"} {"component":"virt-handler","level":"info","msg":"refreshed device plugins for permitted/forbidden host devices","pos":"device_controller.go:320","timestamp":"2023-02-08T18:45:07.702002Z"} {"component":"virt-handler","level":"info","msg":"enabled device-plugins for: []","pos":"device_controller.go:321","timestamp":"2023-02-08T18:45:07.702053Z"} {"component":"virt-handler","level":"info","msg":"disabled device-plugins for: []","pos":"device_controller.go:322","timestamp":"2023-02-08T18:45:07.702064Z"} {"component":"virt-handler","level":"info","msg":"Successfully removed mdev 203276d5-ac06-4585-baf3-ff16e119d634","pos":"common.go:168","timestamp":"2023-02-08T18:47:06.327329Z"} {"component":"virt-handler","level":"warning","msg":"failed to remove mdev type: 203276d5-ac06-4585-baf3-ff16e119d634","pos":"mediated_devices_types.go:270","timestamp":"2023-02-08T18:47:06.327396Z"} {"component":"virt-handler","level":"info","msg":"Successfully removed mdev 2bd56759-c812-4784-9aea-3d9df23d15d3","pos":"common.go:168","timestamp":"2023-02-08T18:47:06.375248Z"} {"component":"virt-handler","level":"warning","msg":"failed to remove mdev type: 2bd56759-c812-4784-9aea-3d9df23d15d3","pos":"mediated_devices_types.go:270","timestamp":"2023-02-08T18:47:06.375311Z"} {"component":"virt-handler","level":"info","msg":"Successfully removed mdev 63b0b313-a62f-4475-b274-c26dd7defbcd","pos":"common.go:168","timestamp":"2023-02-08T18:47:06.411902Z"} {"component":"virt-handler","level":"warning","msg":"failed to remove mdev type: 63b0b313-a62f-4475-b274-c26dd7defbcd","pos":"mediated_devices_types.go:270","timestamp":"2023-02-08T18:47:06.411965Z"} {"component":"virt-handler","level":"info","msg":"Successfully removed mdev f4fd3e66-f062-45dd-8ec0-39a7a2201490","pos":"common.go:168","timestamp":"2023-02-08T18:47:06.444875Z"} {"component":"virt-handler","level":"warning","msg":"failed to remove mdev type: f4fd3e66-f062-45dd-8ec0-39a7a2201490","pos":"mediated_devices_types.go:270","timestamp":"2023-02-08T18:47:06.444917Z"}

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