Christoph Hellwig fb5e31d970
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 >
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