[Qemu-devel] [PATCH v9 13/20] Add mandatory_features to vhost_dev

[Antonios Motakis <a.motakis@virtualopensystems.com>]

This will be used in a following patch to ensure that a vhost-user
client reconnecting to QEMU supports the features that were exposed
by the first client that initiated the virtio-net session.

Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
---
 hw/net/vhost_net.c        | 10 ++++++++++
 include/hw/virtio/vhost.h |  1 +
 include/net/vhost_net.h   |  2 ++
 3 files changed, 13 insertions(+)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 0fb4fa5..38e1e8a 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -80,6 +80,11 @@ void vhost_net_ack_features(struct vhost_net *net, unsigned features)
     }
 }
 
+unsigned long long vhost_net_features(VHostNetState *net)
+{
+    return net->dev.features;
+}
+
 static int vhost_net_get_fd(NetClientState *backend)
 {
     switch (backend->info->type) {
@@ -112,6 +117,7 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options)
 
     net->dev.nvqs = 2;
     net->dev.vqs = net->vqs;
+    net->dev.mandatory_features = options->mandatory_features;
 
     r = vhost_dev_init(&net->dev, options->opaque,
                        options->force);
@@ -347,6 +353,10 @@ unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
 void vhost_net_ack_features(struct vhost_net *net, unsigned features)
 {
 }
+unsigned long long vhost_net_features(struct vhost_net *net)
+{
+    return 0;
+}
 
 bool vhost_net_virtqueue_pending(VHostNetState *net, int idx)
 {
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 97641b6..0068d40 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -41,6 +41,7 @@ struct vhost_dev {
     unsigned long long features;
     unsigned long long acked_features;
     unsigned long long backend_features;
+    unsigned long long mandatory_features;
     bool started;
     bool log_enabled;
     vhost_log_chunk_t *log;
diff --git a/include/net/vhost_net.h b/include/net/vhost_net.h
index 2067ee2..b39bb45 100644
--- a/include/net/vhost_net.h
+++ b/include/net/vhost_net.h
@@ -10,6 +10,7 @@ typedef struct VhostNetOptions {
     NetClientState *net_backend;
     void *opaque;
     bool force;
+    unsigned long long mandatory_features;
 } VhostNetOptions;
 
 struct vhost_net *vhost_net_init(VhostNetOptions *options);
@@ -22,6 +23,7 @@ void vhost_net_cleanup(VHostNetState *net);
 
 unsigned vhost_net_get_features(VHostNetState *net, unsigned features);
 void vhost_net_ack_features(VHostNetState *net, unsigned features);
+unsigned long long vhost_net_features(VHostNetState *net);
 
 bool vhost_net_virtqueue_pending(VHostNetState *net, int n);
 void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev,
-- 
1.8.3.2