[RFC,v3,18/22] Add LU_VERSION and LU_END records to live update stream

Commit Message

David Woodhouse Jan. 30, 2020, 4:13 p.m. UTC

From: David Woodhouse <[e-mail]>

Signed-off-by: David Woodhouse <[e-mail]>
---
 xen/common/lu/save.c                  | 13 ++++++++++++-
 xen/include/public/migration_stream.h |  9 +++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

Patch

diff --git a/xen/common/lu/save.c b/xen/common/lu/save.c
index c43962c44e..84852da35e 100644
--- a/xen/common/lu/save.c
+++ b/xen/common/lu/save.c
@@ -4,10 +4,17 @@ 
 #include <xen/lu.h>
 #include <xen/kimage.h>
 #include <xen/sched.h>
+#include <xen/version.h>
+#include <public/migration_stream.h>
 
 int lu_save_global(struct lu_stream *stream)
 {
-    return 0;
+    struct mr_lu_version ver_rec;
+
+    ver_rec.xen_major = xen_major_version();
+    ver_rec.xen_minor = xen_minor_version();
+    return lu_stream_append_record(stream, REC_TYPE_LU_VERSION,
+                                   &ver_rec, sizeof(ver_rec));
 }
 
 
@@ -34,6 +41,10 @@  int lu_save_all(struct kexec_image *image)
         ret = lu_save_domain(&stream, d);
     }
 
+    if (!ret)
+        ret = lu_stream_append_record(&stream, REC_TYPE_END,
+                                      NULL, 0);
+
     if (!ret)
         ret = kimage_add_live_update_data(image,
                           _mfn(virt_to_mfn(stream.pagelist)),
diff --git a/xen/include/public/migration_stream.h b/xen/include/public/migration_stream.h
index 92dd119f9f..29ed8cc2b5 100644
--- a/xen/include/public/migration_stream.h
+++ b/xen/include/public/migration_stream.h
@@ -51,6 +51,8 @@  struct mr_rhdr
 #define REC_TYPE_CHECKPOINT                 0x0000000eU
 #define REC_TYPE_CHECKPOINT_DIRTY_PFN_LIST  0x0000000fU
 
+#define REC_TYPE_LU_VERSION                 0x40000000U
+
 #define REC_TYPE_OPTIONAL             0x80000000U
 #define REC_TYPE_LIVE_UPDATE          0x40000000U
 
@@ -113,6 +115,13 @@  struct mr_hvm_params
     struct mr_hvm_params_entry param[0];
 };
 
+/* LU_VERSION */
+struct mr_lu_version
+{
+    uint32_t xen_major;
+    uint32_t xen_minor;
+};
+
 #endif /* __XEN_MIGRATION_STREAM_H__ */
 
 /*