[Xen-devel] [PATCH v8 --for 4.6 COLO 03/25] libxc/migration: Specification update for DIRTY_BITMAP records

[Yang Hongyang <yanghy@xxxxxxxxxxxxxx>]

Used by secondary to send it's dirty bitmap to primary under COLO.

Signed-off-by: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
---
 docs/specs/libxc-migration-stream.pandoc | 24 +++++++++++++++++++++++-
 tools/libxc/xc_sr_common.c               |  1 +
 tools/libxc/xc_sr_stream_format.h        |  1 +
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/docs/specs/libxc-migration-stream.pandoc 
b/docs/specs/libxc-migration-stream.pandoc
index 68fa513..480d357 100644
--- a/docs/specs/libxc-migration-stream.pandoc
+++ b/docs/specs/libxc-migration-stream.pandoc
@@ -227,7 +227,9 @@ type         0x00000000: END
 
              0x0000000E: CHECKPOINT
 
-             0x0000000F - 0x7FFFFFFF: Reserved for future _mandatory_
+             0x0000000F: DIRTY_BITMAP
+
+             0x00000010 - 0x7FFFFFFF: Reserved for future _mandatory_
              records.
 
              0x80000000 - 0xFFFFFFFF: Reserved for future _optional_
@@ -601,6 +603,26 @@ CHECKPOINT record or an END record.
 
 \clearpage
 
+DIRTY_BITMAP
+------------
+
+A dirty_bitmap record is used for secondary to send it's dirty bitmap
+to primary while doing a checkpoint under COLO. This record only exists
+in back channel.
+
+     0     1     2     3     4     5     6     7 octet
+    +-------------------------------------------------+
+    | pfn[0]                                          |
+    +-------------------------------------------------+
+    ...
+    +-------------------------------------------------+
+    | pfn[C-1]                                        |
+    +-------------------------------------------------+
+
+The count of the pfn is: record->length/sizeof(uint64_t).
+
+\clearpage
+
 Layout
 ======
 
diff --git a/tools/libxc/xc_sr_common.c b/tools/libxc/xc_sr_common.c
index 945cfa6..becc0f4 100644
--- a/tools/libxc/xc_sr_common.c
+++ b/tools/libxc/xc_sr_common.c
@@ -35,6 +35,7 @@ static const char *mandatory_rec_types[] =
     [REC_TYPE_X86_PV_VCPU_MSRS]     = "x86 PV vcpu msrs",
     [REC_TYPE_VERIFY]               = "Verify",
     [REC_TYPE_CHECKPOINT]           = "Checkpoint",
+    [REC_TYPE_DIRTY_BITMAP]         = "Dirty bitmap",
 };
 
 const char *rec_type_to_str(uint32_t type)
diff --git a/tools/libxc/xc_sr_stream_format.h 
b/tools/libxc/xc_sr_stream_format.h
index 6d0f8fd..43a0209 100644
--- a/tools/libxc/xc_sr_stream_format.h
+++ b/tools/libxc/xc_sr_stream_format.h
@@ -75,6 +75,7 @@ struct xc_sr_rhdr
 #define REC_TYPE_X86_PV_VCPU_MSRS     0x0000000cU
 #define REC_TYPE_VERIFY               0x0000000dU
 #define REC_TYPE_CHECKPOINT           0x0000000eU
+#define REC_TYPE_DIRTY_BITMAP         0x0000000fU
 
 #define REC_TYPE_OPTIONAL             0x80000000U
 
-- 
1.9.1


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