virtio: enable packed virtqueues

We need to add the VIRTIO_F_PACKED_RING feature bit to the user_feature_bits (for vhost-user) and add the feature to the virtio device feature bits in virtio_pci_pre_plugged. Signed-off-by: Jens Freimann <jfreimann@redhat.com>
jensfr · Feb 6, 2018 · 71b4013 · 71b4013
1 parent 2b3805f
commit 71b4013
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diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
@@ -64,6 +64,7 @@ static const int user_feature_bits[] = {
 
     VIRTIO_F_ANY_LAYOUT,
     VIRTIO_F_VERSION_1,
+    VIRTIO_F_PACKED_RING,
     VIRTIO_NET_F_CSUM,
     VIRTIO_NET_F_GUEST_CSUM,
     VIRTIO_NET_F_GSO,

diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
@@ -1541,6 +1541,7 @@ static void virtio_pci_pre_plugged(DeviceState *d, Error **errp)
 
     if (virtio_pci_modern(proxy)) {
         virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1);
+        virtio_add_feature(&vdev->host_features, VIRTIO_F_PACKED_RING);
     }
 
     virtio_add_feature(&vdev->host_features, VIRTIO_F_BAD_FEATURE);

diff --git a/include/standard-headers/linux/virtio_config.h b/include/standard-headers/linux/virtio_config.h
@@ -71,4 +71,5 @@
  * this is for compatibility with legacy systems.
  */
 #define VIRTIO_F_IOMMU_PLATFORM		33
+#define VIRTIO_F_PACKED_RING            34
 #endif /* _LINUX_VIRTIO_CONFIG_H */