vfio/ccw: Only pass in contiguous pages

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This driver is the only caller of vfio_pin/unpin_pages that might pass
in a non-contiguous PFN list, but in many cases it has a contiguous PFN
list to process. So letting VFIO API handle a non-contiguous PFN list
is actually counterproductive.

Add a pair of simple loops to pass in contiguous PFNs only, to have an
efficient implementation in VFIO.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Tested-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/20220723020256.30081-5-nicolinc@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

...

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Nicolin Chen 2022-07-22 19:02:50 -07:00 • committed by Alex Williamson

parent 10e19d492a

commit cfedb3d5e6

1 changed files with 56 additions and 14 deletions

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drivers/s390/cio/vfio_ccw_cp.c

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