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virtio: allow drivers to request IRQ affinity when creating VQs

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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>
This commit is contained in:
Christoph Hellwig
2017-02-05 18:15:22 +01:00
committed by Michael S. Tsirkin
parent 52a6151612
commit fb5e31d970
20 changed files with 48 additions and 34 deletions
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3
drivers/virtio/virtio_input.c
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@@ -173,7 +173,8 @@ static int virtinput_init_vqs(struct virtio_input *vi)
static const char * const names[] = { "events", "status" };
int err;
err = vi->vdev->config->find_vqs(vi->vdev, 2, vqs, cbs, names);
err = vi->vdev->config->find_vqs(vi->vdev, 2, vqs, cbs, names,
NULL);
if (err)
return err;
vi->evt = vqs[0];