tree f7b64532549f35aad0933fae46346e59151d3a71
parent 52a61516125fa9a21b3bdf4f90928308e2e5573f
author Christoph Hellwig <hch@lst.de> 1486314922 +0100
committer Michael S. Tsirkin <mst@redhat.com> 1488221644 +0200

virtio: allow drivers to request IRQ affinity when creating VQs

Add a struct irq_affinity pointer to the find_vqs methods, which if set
is used to tell the PCI layer to create the MSI-X vectors for our I/O
virtqueues with the proper affinity from the start.  Compared to after
the fact affinity hints this gives us an instantly working setup and
allows to allocate the irq descritors node-local and avoid interconnect
traffic.  Last but not least this will allow blk-mq queues are created
based on the interrupt affinity for storage drivers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>