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authorChangchun Ouyang <changchun.ouyang@intel.com>2015-09-23 12:20:01 +0800
committerMichael S. Tsirkin <mst@redhat.com>2015-09-24 16:27:53 +0300
commit7263a0ad7899994b719ebed736a1119cc2e08110 (patch)
tree6e832134bdf7c95b2a8ba0e9f03b47c0f7a216b5 /docs
parentb931bfbf042983f311b3b09894d8030b2755a638 (diff)
vhost-user: add a new message to disable/enable a specific virt queue.
Add a new message, VHOST_USER_SET_VRING_ENABLE, to enable or disable a specific virt queue, which is similar to attach/detach queue for tap device. virtio driver on guest doesn't have to use max virt queue pair, it could enable any number of virt queue ranging from 1 to max virt queue pair. Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: Jason Wang <jasowang@redhat.com> Tested-by: Marcel Apfelbaum <marcel@redhat.com>
Diffstat (limited to 'docs')
-rw-r--r--docs/specs/vhost-user.txt12
1 files changed, 11 insertions, 1 deletions
diff --git a/docs/specs/vhost-user.txt b/docs/specs/vhost-user.txt
index cfc9d411ff..4eadad1d6b 100644
--- a/docs/specs/vhost-user.txt
+++ b/docs/specs/vhost-user.txt
@@ -148,7 +148,9 @@ VHOST_USER_GET_PROTOCOL_FEATURES. Master should stop when the number of
requested queues is bigger than that.
As all queues share one connection, the master uses a unique index for each
-queue in the sent message to identify a specified queue.
+queue in the sent message to identify a specified queue. One queue pair
+is enabled initially. More queues are enabled dynamically, by sending
+message VHOST_USER_SET_VRING_ENABLE.
Message types
-------------
@@ -327,3 +329,11 @@ Message types
Query how many queues the backend supports. This request should be
sent only when VHOST_USER_PROTOCOL_F_MQ is set in quried protocol
features by VHOST_USER_GET_PROTOCOL_FEATURES.
+
+ * VHOST_USER_SET_VRING_ENABLE
+
+ Id: 18
+ Equivalent ioctl: N/A
+ Master payload: vring state description
+
+ Signal slave to enable or disable corresponding vring.