[RFC v4 08/11] uapi: Align vduse.h for enable and suspend VDUSE messages

["Eugenio Pérez" <eperezma@redhat.com>]

From: Maxime Coquelin <maxime.coquelin@redhat.com>

This is a prerequisite for next patches to use them.

These features are required to properly support live migration and proper
device initialization ordering.

These are not in maintainer's branch at the moment:
https://lore.kernel.org/lkml/20260310190759.1097506-1-eperezma@redhat.com
https://lore.kernel.org/lkml/20260310191019.1099757-1-eperezma@redhat.com

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 kernel/linux/uapi/linux/vduse.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/kernel/linux/uapi/linux/vduse.h b/kernel/linux/uapi/linux/vduse.h
index 361eea511c21..b7f8c04a0a44 100644
--- a/kernel/linux/uapi/linux/vduse.h
+++ b/kernel/linux/uapi/linux/vduse.h
@@ -14,6 +14,12 @@
 
 #define VDUSE_API_VERSION_1	1
 
+/* The VDUSE instance expects a request for vq ready */
+#define VDUSE_F_QUEUE_READY	0
+
+/* The VDUSE instance expects a request for suspend */
+#define VDUSE_F_SUSPEND		1
+
 /*
  * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION).
  * This is used for future extension.
@@ -63,6 +69,12 @@ struct vduse_dev_config {
  */
 #define VDUSE_DESTROY_DEV	_IOW(VDUSE_BASE, 0x03, char[VDUSE_NAME_MAX])
 
+/* Get the VDUSE supported features */
+#define VDUSE_GET_FEATURES	_IOR(VDUSE_BASE, 0x04, __u64)
+
+/* Set the VDUSE features */
+#define VDUSE_SET_FEATURES	_IOW(VDUSE_BASE, 0x05, __u64)
+
 /* The ioctls for VDUSE device (/dev/vduse/$NAME) */
 
 /**
@@ -325,6 +337,8 @@ enum vduse_req_type {
 	VDUSE_SET_STATUS,
 	VDUSE_UPDATE_IOTLB,
 	VDUSE_SET_VQ_GROUP_ASID,
+	VDUSE_SET_VQ_READY,
+	VDUSE_SUSPEND,
 };
 
 /**
@@ -372,6 +386,15 @@ struct vduse_iova_range_v2 {
 	__u32 padding;
 };
 
+/**
+ * struct vduse_vq_ready - Virtqueue ready request message
+ * @num: Virtqueue number
+ */
+struct vduse_vq_ready {
+	__u32 num;
+	__u32 ready;
+};
+
 /**
  * struct vduse_dev_request - control request
  * @type: request type
@@ -382,6 +405,7 @@ struct vduse_iova_range_v2 {
  * @iova: IOVA range for updating
  * @iova_v2: IOVA range for updating if API_VERSION >= 1
  * @vq_group_asid: ASID of a virtqueue group
+ * @vq_ready: Virtqueue ready request
  * @padding: padding
  *
  * Structure used by read(2) on /dev/vduse/$NAME.
@@ -399,6 +423,10 @@ struct vduse_dev_request {
 		 */
 		struct vduse_iova_range_v2 iova_v2;
 		struct vduse_vq_group_asid vq_group_asid;
+
+		/* Only if VDUSE_F_QUEUE_READY is negotiated */
+		struct vduse_vq_ready vq_ready;
+
 		__u32 padding[32];
 	};
 };
-- 
2.55.0