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virtio_pci_modern: support devices with no config 

Virtio 1.0 spec lists device config as optional.
Set get/set callbacks to NULL. Drivers can check that
and fail gracefully.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Michael S. Tsirkin 2015-01-13 16:34:58 +02:00 committed by Rusty Russell
parent 3909213cfd
commit d3f5f06560
1 changed files with 19 additions and 2 deletions
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21
drivers/virtio/virtio_pci_modern.c
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@ -422,6 +422,21 @@ static void del_vq(struct virtio_pci_vq_info *info)
free_pages_exact(info->queue, vring_pci_size(info->num));
}
static const struct virtio_config_ops virtio_pci_config_nodev_ops = {
.get = NULL,
.set = NULL,
.generation = vp_generation,
.get_status = vp_get_status,
.set_status = vp_set_status,
.reset = vp_reset,
.find_vqs = vp_modern_find_vqs,
.del_vqs = vp_del_vqs,
.get_features = vp_get_features,
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
};
static const struct virtio_config_ops virtio_pci_config_ops = {
.get = vp_get,
.set = vp_set,
@ -652,9 +667,11 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev)
&vp_dev->device_len);
if (!vp_dev->device)
goto err_map_device;
}
vp_dev->vdev.config = &virtio_pci_config_ops;
vp_dev->vdev.config = &virtio_pci_config_ops;
} else {
vp_dev->vdev.config = &virtio_pci_config_nodev_ops;
}
vp_dev->config_vector = vp_config_vector;
vp_dev->setup_vq = setup_vq;