[RFC V1 4/7] vdpa/cpr: kernel interfaces

[Steve Sistare]

Add the proposed vdpa kernel interfaces for CPR:
  VHOST_NEW_OWNER: new ioctl
  VHOST_BACKEND_F_NEW_OWNER: new capability
  VHOST_IOTLB_REMAP: new iotlb message
  VHOST_BACKEND_F_IOTLB_REMAP: new capability

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 include/standard-headers/linux/vhost_types.h | 7 +++++++
 linux-headers/linux/vhost.h                  | 9 +++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/standard-headers/linux/vhost_types.h 
b/include/standard-headers/linux/vhost_types.h
index fd54044936..fa605ee1da 100644
--- a/include/standard-headers/linux/vhost_types.h
+++ b/include/standard-headers/linux/vhost_types.h
@@ -87,6 +87,7 @@ struct vhost_iotlb_msg {
  */
 #define VHOST_IOTLB_BATCH_BEGIN    5
 #define VHOST_IOTLB_BATCH_END      6
+#define VHOST_IOTLB_REMAP          7
        uint8_t type;
 };
 
@@ -193,4 +194,10 @@ struct vhost_vdpa_iova_range {
 /* IOTLB don't flush memory mapping across device reset */
 #define VHOST_BACKEND_F_IOTLB_PERSIST  0x8
 
+/* Supports VHOST_NEW_OWNER */
+#define VHOST_BACKEND_F_NEW_OWNER  0x9
+
+/* Supports VHOST_IOTLB_REMAP */
+#define VHOST_BACKEND_F_IOTLB_REMAP  0xa
+
 #endif
diff --git a/linux-headers/linux/vhost.h b/linux-headers/linux/vhost.h
index b95dd84eef..6c008c956a 100644
--- a/linux-headers/linux/vhost.h
+++ b/linux-headers/linux/vhost.h
@@ -123,6 +123,15 @@
 #define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64)
 #define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64)
 
+/* Set current process as the new owner of this file descriptor.  The fd must
+ * already be owned, via a prior call to VHOST_SET_OWNER.  The pinned memory
+ * count is transferred from the previous to the new owner.
+ * Errors:
+ *   EINVAL: not owned
+ *   EBUSY:  caller is already the owner
+ *   ENOMEM: RLIMIT_MEMLOCK exceeded
+ */
+#define VHOST_NEW_OWNER                _IO(VHOST_VIRTIO, 0x27)
 /* VHOST_NET specific defines */
 
 /* Attach virtio net ring to a raw socket, or tap device.
-- 
2.39.3