virtio: Add get_vq_count() callback
Modern virtio requires devices to report how many queues they support. Add an operation to query all devices about their capacities. Signed-off-by:Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Signed-off-by:
Julien Thierry <julien.thierry@arm.com> Signed-off-by:
Will Deacon <will.deacon@arm.com>
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