vfio: Have the core code decode the VFIO_DEVICE_FEATURE ioctl

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Invoke a new device op 'device_feature' to handle just the data array
portion of the command. This lifts the ioctl validation to the core code
and makes it simpler for either the core code, or layered drivers, to
implement their own feature values.

Provide vfio_check_feature() to consolidate checking the flags/etc against
what the driver supports.

Link: https://lore.kernel.org/all/20220224142024.147653-9-yishaih@nvidia.com
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

...

This commit is contained in:

Jason Gunthorpe 2022-02-24 16:20:17 +02:00 • committed by Leon Romanovsky

parent 40f958ea57

commit 445ad495f0

5 changed files with 114 additions and 61 deletions

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1

drivers/vfio/pci/vfio_pci.c

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100

drivers/vfio/pci/vfio_pci_core.c

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46

drivers/vfio/vfio.c

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32

include/linux/vfio.h

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include/linux/vfio_pci_core.h

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