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| author | Michael S. Tsirkin <mst@redhat.com> | 2014-12-04 18:49:58 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-12-09 12:06:33 +0200 |
| commit | b6098c30423cb1f0f5a4d0a5495e2670e274e544 (patch) | |
| tree | 6f3c5ebe2d6fe46677444406eddc8d3a9943a0ea | |
| parent | 48b36066b48025b7cd7d46c9a879f2f72fd9086a (diff) | |
| download | lwn-b6098c30423cb1f0f5a4d0a5495e2670e274e544.tar.gz lwn-b6098c30423cb1f0f5a4d0a5495e2670e274e544.zip | |
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>
| -rw-r--r-- | drivers/virtio/virtio.c | 7 | ||||
| -rw-r--r-- | include/linux/virtio.h | 2 |
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index fa6b75db5f1f..224f85442f3f 100644 --- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -3,6 +3,7 @@ #include <linux/virtio_config.h> #include <linux/module.h> #include <linux/idr.h> +#include <uapi/linux/virtio_ids.h> /* Unique numbering for virtio devices. */ static DEFINE_IDA(virtio_index_ida); @@ -267,6 +268,12 @@ static struct bus_type virtio_bus = { .remove = virtio_dev_remove, }; +bool virtio_device_is_legacy_only(struct virtio_device_id id) +{ + return id.device == VIRTIO_ID_BALLOON; +} +EXPORT_SYMBOL_GPL(virtio_device_is_legacy_only); + int register_virtio_driver(struct virtio_driver *driver) { /* Catch this early. */ diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 2bbf62697671..d666bcb57401 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -108,6 +108,8 @@ struct virtio_device { void *priv; }; +bool virtio_device_is_legacy_only(struct virtio_device_id id); + static inline struct virtio_device *dev_to_virtio(struct device *_dev) { return container_of(_dev, struct virtio_device, dev); |