vfio: avoid inefficient operations on VFIO group in vfio_pin/unpin_pages

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vfio_group_pin_pages() and vfio_group_unpin_pages() are introduced to
avoid inefficient search/check/ref/deref opertions associated with VFIO
group as those in each calling into vfio_pin_pages() and
vfio_unpin_pages().

VFIO group is taken as arg directly. The callers combine
search/check/ref/deref operations associated with VFIO group by calling
vfio_group_get_external_user()/vfio_group_get_external_user_from_dev()
beforehand, and vfio_group_put_external_user() afterwards.

Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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Yan Zhao 2020-03-24 09:27:57 -06:00 • committed by Alex Williamson

parent 8d46c0cca5

commit 40280cf7e8

2 changed files with 97 additions and 0 deletions

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91

drivers/vfio/vfio.c

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6

include/linux/vfio.h

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