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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 /hw/virtio
parentb931bfbf042983f311b3b09894d8030b2755a638 (diff)
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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 'hw/virtio')
-rw-r--r--hw/virtio/vhost-user.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index e42fde6..b11c0d2 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -48,6 +48,7 @@ typedef enum VhostUserRequest {
VHOST_USER_GET_PROTOCOL_FEATURES = 15,
VHOST_USER_SET_PROTOCOL_FEATURES = 16,
VHOST_USER_GET_QUEUE_NUM = 17,
+ VHOST_USER_SET_VRING_ENABLE = 18,
VHOST_USER_MAX
} VhostUserRequest;
@@ -290,6 +291,7 @@ static int vhost_user_call(struct vhost_dev *dev, unsigned long int request,
case VHOST_USER_SET_VRING_NUM:
case VHOST_USER_SET_VRING_BASE:
+ case VHOST_USER_SET_VRING_ENABLE:
memcpy(&msg.state, arg, sizeof(struct vhost_vring_state));
msg.size = sizeof(m.state);
break;
@@ -406,6 +408,22 @@ static int vhost_user_init(struct vhost_dev *dev, void *opaque)
return 0;
}
+static int vhost_user_set_vring_enable(struct vhost_dev *dev, int enable)
+{
+ struct vhost_vring_state state = {
+ .index = dev->vq_index,
+ .num = enable,
+ };
+
+ assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
+
+ if (!(dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_MQ))) {
+ return -1;
+ }
+
+ return vhost_user_call(dev, VHOST_USER_SET_VRING_ENABLE, &state);
+}
+
static int vhost_user_cleanup(struct vhost_dev *dev)
{
assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER);
@@ -428,4 +446,5 @@ const VhostOps user_ops = {
.vhost_backend_init = vhost_user_init,
.vhost_backend_cleanup = vhost_user_cleanup,
.vhost_backend_get_vq_index = vhost_user_get_vq_index,
+ .vhost_backend_set_vring_enable = vhost_user_set_vring_enable,
};