[Xen-devel] [PATCH v9 03/25] libxc/migration: Specification update for DIRTY_PFN_LIST records

[Wen Congyang <wency@xxxxxxxxxxxxxx>]

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

Signed-off-by: Yang Hongyang <hongyang.yang@xxxxxxxxxxxx>
Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
---
 docs/specs/libxc-migration-stream.pandoc | 24 +++++++++++++++++++++++-
 tools/libxc/xc_sr_common.c               |  1 +
 tools/libxc/xc_sr_stream_format.h        |  1 +
 tools/python/xen/migration/libxc.py      |  8 ++++++++
 4 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/docs/specs/libxc-migration-stream.pandoc 
b/docs/specs/libxc-migration-stream.pandoc
index 8cd678f..ae1f1d0 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_PFN_LIST
+
+             0x00000010 - 0x7FFFFFFF: Reserved for future _mandatory_
              records.
 
              0x80000000 - 0xFFFFFFFF: Reserved for future _optional_
@@ -599,6 +601,26 @@ CHECKPOINT record or an END record.
 
 \clearpage
 
+DIRTY_PFN_LIST
+------------
+
+A dirty pfn list record is used to convey information about dirty memory
+in the VM. It is an unordered list of PFNs. Currently only applicable in
+the backchannel of a checkpointed stream.
+
+     0     1     2     3     4     5     6     7 octet
+    +-------------------------------------------------+
+    | pfn[0]                                          |
+    +-------------------------------------------------+
+    ...
+    +-------------------------------------------------+
+    | pfn[C-1]                                        |
+    +-------------------------------------------------+
+
+The count of pfns 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..8150140 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_PFN_LIST]       = "Dirty pfn list",
 };
 
 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..8b8533f 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_PFN_LIST       0x0000000fU
 
 #define REC_TYPE_OPTIONAL             0x80000000U
 
diff --git a/tools/python/xen/migration/libxc.py 
b/tools/python/xen/migration/libxc.py
index b0255ac..47da5e3 100644
--- a/tools/python/xen/migration/libxc.py
+++ b/tools/python/xen/migration/libxc.py
@@ -60,6 +60,7 @@ REC_TYPE_toolstack            = 0x0000000b
 REC_TYPE_x86_pv_vcpu_msrs     = 0x0000000c
 REC_TYPE_verify               = 0x0000000d
 REC_TYPE_checkpoint           = 0x0000000e
+REC_TYPE_dirty_pfn_list       = 0x0000000f
 
 rec_type_to_str = {
     REC_TYPE_end                  : "End",
@@ -77,6 +78,7 @@ rec_type_to_str = {
     REC_TYPE_x86_pv_vcpu_msrs     : "x86 PV vcpu msrs",
     REC_TYPE_verify               : "Verify",
     REC_TYPE_checkpoint           : "Checkpoint",
+    REC_TYPE_dirty_pfn_list       : "Dirty pfn list"
 }
 
 # page_data
@@ -403,6 +405,10 @@ class VerifyLibxc(VerifyBase):
         if len(content) != 0:
             raise RecordError("Checkpoint record with non-zero length")
 
+    def verify_record_dirty_pfn_list(self, content):
+        """ dirty pfn list """
+        raise RecordError("Found dirty pfn list record in stream")
+
 
 record_verifiers = {
     REC_TYPE_end:
@@ -443,4 +449,6 @@ record_verifiers = {
         VerifyLibxc.verify_record_verify,
     REC_TYPE_checkpoint:
         VerifyLibxc.verify_record_checkpoint,
+    REC_TYPE_dirty_pfn_list:
+        VerifyLibxc.verify_record_dirty_pfn_list,
     }
-- 
2.5.0




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