virtio: add API to detect legacy devices
transports need to be able to detect legacy-only devices (ATM balloon only) to use legacy path to drive them. Add a core API to do just that. The implementation just blacklists balloon: not too pretty, but let's not over-engineer. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
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@ -3,6 +3,7 @@
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#include <linux/virtio_config.h>
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#include <linux/module.h>
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#include <linux/idr.h>
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#include <uapi/linux/virtio_ids.h>
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/* Unique numbering for virtio devices. */
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static DEFINE_IDA(virtio_index_ida);
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@ -267,6 +268,12 @@ static struct bus_type virtio_bus = {
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.remove = virtio_dev_remove,
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};
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bool virtio_device_is_legacy_only(struct virtio_device_id id)
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{
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return id.device == VIRTIO_ID_BALLOON;
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}
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EXPORT_SYMBOL_GPL(virtio_device_is_legacy_only);
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int register_virtio_driver(struct virtio_driver *driver)
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{
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/* Catch this early. */
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@ -108,6 +108,8 @@ struct virtio_device {
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void *priv;
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};
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bool virtio_device_is_legacy_only(struct virtio_device_id id);
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static inline struct virtio_device *dev_to_virtio(struct device *_dev)
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{
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return container_of(_dev, struct virtio_device, dev);
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