s390/vfio-ap: prepare for dynamic update of guest's APCB on assign/unassign

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The functions backing the matrix mdev's sysfs attribute interfaces to
assign/unassign adapters, domains and control domains must take and
release the locks required to perform a dynamic update of a guest's APCB
in the proper order.

The proper order for taking the locks is:

matrix_dev->guests_lock => kvm->lock => matrix_dev->mdevs_lock

The proper order for releasing the locks is:

matrix_dev->mdevs_lock => kvm->lock => matrix_dev->guests_lock

Two new macros are introduced for this purpose: One to take the locks and
the other to release the locks. These macros will be used by the
assignment/unassignment functions to prepare for dynamic update of
the KVM guest's APCB.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

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Tony Krowiak 2022-03-16 22:21:38 -04:00 • committed by Alexander Gordeev

parent b84eb8e050

commit 8ee13ad993

1 changed files with 59 additions and 12 deletions

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drivers/s390/crypto/vfio_ap_ops.c

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