Subject: [PATCH net-next v12 04/12] virtio: Expose object create and destroy API

From: Daniel Jurgens <[email-masked]>
Date: Wed, 19 Nov 2025 13:15:15 -0600

Object create and destroy were implemented specifically for dev parts
device objects. Create general purpose APIs for use by upper layer
drivers.

Signed-off-by: Daniel Jurgens <[email-masked]>
Reviewed-by: Parav Pandit <[email-masked]>
Reviewed-by: Xuan Zhuo <[email-masked]>

---
v4: Moved this logic from virtio_pci_modern to new file
    virtio_admin_commands.
v5: Added missing params, and synced names in comments (Alok Tiwari)
---
 drivers/virtio/virtio_admin_commands.c | 75 ++++++++++++++++++++++++++
 include/linux/virtio_admin.h           | 44 +++++++++++++++
 2 files changed, 119 insertions(+)

diff --git a/drivers/virtio/virtio_admin_commands.c b/drivers/virtio/virtio_admin_commands.c
index a2254e71e8dc..4738ffe3b5c6 100644
--- a/drivers/virtio/virtio_admin_commands.c
+++ b/drivers/virtio/virtio_admin_commands.c
@@ -89,3 +89,78 @@ int virtio_admin_cap_set(struct virtio_device *vdev,
 	return err;
 }
 EXPORT_SYMBOL_GPL(virtio_admin_cap_set);
+
+int virtio_admin_obj_create(struct virtio_device *vdev,
+			    u16 obj_type,
+			    u32 obj_id,
+			    u16 group_type,
+			    u64 group_member_id,
+			    const void *obj_specific_data,
+			    size_t obj_specific_data_size)
+{
+	size_t data_size = sizeof(struct virtio_admin_cmd_resource_obj_create_data);
+	struct virtio_admin_cmd_resource_obj_create_data *obj_create_data;
+	struct virtio_admin_cmd cmd = {};
+	struct scatterlist data_sg;
+	void *data;
+	int err;
+
+	if (!vdev->config->admin_cmd_exec)
+		return -EOPNOTSUPP;
+
+	data_size += obj_specific_data_size;
+	data = kzalloc(data_size, GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	obj_create_data = data;
+	obj_create_data->hdr.type = cpu_to_le16(obj_type);
+	obj_create_data->hdr.id = cpu_to_le32(obj_id);
+	memcpy(obj_create_data->resource_obj_specific_data, obj_specific_data,
+	       obj_specific_data_size);
+	sg_init_one(&data_sg, data, data_size);
+
+	cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_RESOURCE_OBJ_CREATE);
+	cmd.group_type = cpu_to_le16(group_type);
+	cmd.group_member_id = cpu_to_le64(group_member_id);
+	cmd.data_sg = &data_sg;
+
+	err = vdev->config->admin_cmd_exec(vdev, &cmd);
+	kfree(data);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(virtio_admin_obj_create);
+
+int virtio_admin_obj_destroy(struct virtio_device *vdev,
+			     u16 obj_type,
+			     u32 obj_id,
+			     u16 group_type,
+			     u64 group_member_id)
+{
+	struct virtio_admin_cmd_resource_obj_cmd_hdr *data;
+	struct virtio_admin_cmd cmd = {};
+	struct scatterlist data_sg;
+	int err;
+
+	if (!vdev->config->admin_cmd_exec)
+		return -EOPNOTSUPP;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->type = cpu_to_le16(obj_type);
+	data->id = cpu_to_le32(obj_id);
+	sg_init_one(&data_sg, data, sizeof(*data));
+	cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_RESOURCE_OBJ_DESTROY);
+	cmd.group_type = cpu_to_le16(group_type);
+	cmd.group_member_id = cpu_to_le64(group_member_id);
+	cmd.data_sg = &data_sg;
+
+	err = vdev->config->admin_cmd_exec(vdev, &cmd);
+	kfree(data);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(virtio_admin_obj_destroy);
diff --git a/include/linux/virtio_admin.h b/include/linux/virtio_admin.h
index 4ab84d53c924..ea51351c5a0f 100644
--- a/include/linux/virtio_admin.h
+++ b/include/linux/virtio_admin.h
@@ -77,4 +77,48 @@ int virtio_admin_cap_set(struct virtio_device *vdev,
 			 const void *caps,
 			 size_t cap_size);
 
+/**
+ * virtio_admin_obj_create - Create an object on a virtio device
+ * @vdev: the virtio device
+ * @obj_type: type of object to create
+ * @obj_id: ID for the new object
+ * @group_type: administrative group type for the operation
+ * @group_member_id: member identifier within the administrative group
+ * @obj_specific_data: object-specific data for creation
+ * @obj_specific_data_size: size of the object-specific data in bytes
+ *
+ * Creates a new object on the virtio device with the specified type and ID.
+ * The object may require object-specific data for proper initialization.
+ *
+ * Return: 0 on success, -EOPNOTSUPP if the device doesn't support admin
+ * operations or object creation, or a negative error code on other failures.
+ */
+int virtio_admin_obj_create(struct virtio_device *vdev,
+			    u16 obj_type,
+			    u32 obj_id,
+			    u16 group_type,
+			    u64 group_member_id,
+			    const void *obj_specific_data,
+			    size_t obj_specific_data_size);
+
+/**
+ * virtio_admin_obj_destroy - Destroy an object on a virtio device
+ * @vdev: the virtio device
+ * @obj_type: type of object to destroy
+ * @obj_id: ID of the object to destroy
+ * @group_type: administrative group type for the operation
+ * @group_member_id: member identifier within the administrative group
+ *
+ * Destroys an existing object on the virtio device with the specified type
+ * and ID.
+ *
+ * Return: 0 on success, -EOPNOTSUPP if the device doesn't support admin
+ * operations or object destruction, or a negative error code on other failures.
+ */
+int virtio_admin_obj_destroy(struct virtio_device *vdev,
+			     u16 obj_type,
+			     u32 obj_id,
+			     u16 group_type,
+			     u64 group_member_id);
+
 #endif /* _LINUX_VIRTIO_ADMIN_H */
-- 
2.50.1