Re: [RFC v2 04/13] vhost: Add x-vhost-enable-shadow-vq qmp

Command to enable shadow virtqueue looks like:

{ "execute": "x-vhost-enable-shadow-vq", "arguments": { "name": "dev0", "enable": true } }

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 qapi/net.json     | 22 ++++++++++++++++++++++
 hw/virtio/vhost.c |  6 ++++++
 2 files changed, 28 insertions(+)

diff --git a/qapi/net.json b/qapi/net.json
index c31748c87f..4c5f65d021 100644
--- a/qapi/net.json
+++ b/qapi/net.json

@@ -77,6 +77,28 @@
 ##
 { 'command': 'netdev_del', 'data': {'id': 'str'} }
 
+##
+# @x-vhost-enable-shadow-vq:
+#
+# Use vhost shadow virtqueue.
+#
+# @name: the device name of the VirtIO device
+#
+# @enable: true to use he alternate shadow VQ notification path
+#
+# Returns: Error if failure, or 'no error' for success. Not found if vhost is not enabled.
+#
+# Since: 6.0
+#
+# Example:
+#
+# -> { "execute": "x-vhost-enable-shadow-vq", "arguments": { "name": "virtio-net", "enable": false } }