s

On Mon, Feb 9, 2026 at 1:32 AM Michael S. Tsirkin [off-list ref] wrote:

On Sun, Feb 08, 2026 at 10:32:22PM +0800, Cindy Lu wrote:

quoted

Add VHOST_NET_SET_FILTER ioctl and the filter socket protocol used for
vhost-net filter offload.

Signed-off-by: Cindy Lu <redacted>
---
 include/uapi/linux/vhost.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index c57674a6aa0d..d9a0ca7a3df0 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h

@@ -131,6 +131,26 @@
  * device.  This can be used to stop the ring (e.g. for migration). */
 #define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)

+/* VHOST_NET filter offload (kernel vhost-net dataplane through QEMU netfilter) */
+struct vhost_net_filter {
+     __s32 fd;
+};
+
+enum {
+     VHOST_NET_FILTER_MSG_REQUEST = 1,
+};
+
+#define VHOST_NET_FILTER_DIRECTION_TX 1
+
+struct vhost_net_filter_msg {
+     __u16 type;
+     __u16 direction;
+     __u32 len;
+};
+
+
+#define VHOST_NET_SET_FILTER _IOW(VHOST_VIRTIO, 0x31, struct vhost_net_filter)
+
 /* VHOST_SCSI specific defines */

can we get some info on what this is supposed to be doing, pls?
it belongs here where userspace devs can find it, not hidden
in code.

Hi Michael
We plan to add a new feature to support zero packet loss during live
migration, so we’re introducing this new UAPI. Thanks, I'll add more
information here.
Thanks
Cindy

quoted

 #define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target)
--
2.52.0