vfio/pci: Prepare for dynamic interrupt context storage

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Interrupt context storage is statically allocated at the time
interrupts are allocated. Following allocation, the interrupt
context is managed by directly accessing the elements of the
array using the vector as index.

It is possible to allocate additional MSI-X vectors after
MSI-X has been enabled. Dynamic storage of interrupt context
is needed to support adding new MSI-X vectors after initial
allocation.

Replace direct access of array elements with pointers to the
array elements. Doing so reduces impact of moving to a new data
structure. Move interactions with the array to helpers to
mostly contain changes needed to transition to a dynamic
data structure.

No functional change intended.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/eab289693c8325ede9aba99380f8b8d5143980a4.1683740667.git.reinette.chatre@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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Reinette Chatre 2023-05-11 08:44:30 -07:00 • committed by Alex Williamson

parent 6578ed85c7

commit d977e0f766

1 changed files with 149 additions and 66 deletions

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drivers/vfio/pci/vfio_pci_intrs.c

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