virtio: provide a method to get the IRQ affinity mask for a virtqueue
This basically passed up the pci_irq_get_affinity information through virtio through an optional get_vq_affinity method. It is only implemented by the PCI backend for now, and only when we use per-virtqueue IRQs. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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