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authorMichael S. Tsirkin <mst@redhat.com>2014-10-23 19:07:47 +0400
committerMichael S. Tsirkin <mst@redhat.com>2014-12-09 13:05:26 +0300
commitb3bb62d11950eb6ac87403cacd667f84fa9495bc (patch)
treef3aee72f5e622722d19c484c7f5925990e97cffb /include/linux/virtio.h
parentc102659d690d382171bd2e40f35c5c811f0cdcac (diff)
downloadlinux-b3bb62d11950eb6ac87403cacd667f84fa9495bc.tar.xz
virtio: add legacy feature table support
virtio-blk has some legacy feature bits that modern drivers must not negotiate, but are needed for old legacy hosts (that e.g. don't support virtio-scsi). Allow a separate legacy feature table for such cases. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'include/linux/virtio.h')
-rw-r--r--include/linux/virtio.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index d6359a5d5d4e..f70411eb9d27 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -130,6 +130,8 @@ int virtio_device_restore(struct virtio_device *dev);
* @id_table: the ids serviced by this driver.
* @feature_table: an array of feature numbers supported by this driver.
* @feature_table_size: number of entries in the feature table array.
+ * @feature_table_legacy: same as feature_table but when working in legacy mode.
+ * @feature_table_size_legacy: number of entries in feature table legacy array.
* @probe: the function to call when a device is found. Returns 0 or -errno.
* @remove: the function to call when a device is removed.
* @config_changed: optional function to call when the device configuration
@@ -140,6 +142,8 @@ struct virtio_driver {
const struct virtio_device_id *id_table;
const unsigned int *feature_table;
unsigned int feature_table_size;
+ const unsigned int *feature_table_legacy;
+ unsigned int feature_table_size_legacy;
int (*probe)(struct virtio_device *dev);
void (*scan)(struct virtio_device *dev);
void (*remove)(struct virtio_device *dev);