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authorMichael S. Tsirkin <mst@redhat.com>2014-12-04 19:49:58 +0300
committerMichael S. Tsirkin <mst@redhat.com>2014-12-09 13:06:33 +0300
commitb6098c30423cb1f0f5a4d0a5495e2670e274e544 (patch)
tree6f3c5ebe2d6fe46677444406eddc8d3a9943a0ea /drivers/virtio
parent48b36066b48025b7cd7d46c9a879f2f72fd9086a (diff)
downloadlinux-b6098c30423cb1f0f5a4d0a5495e2670e274e544.tar.xz
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>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio.c7
1 files changed, 7 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. */