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-rw-r--r--qapi-schema.json8
1 files changed, 7 insertions, 1 deletions
diff --git a/qapi-schema.json b/qapi-schema.json
index 8d33d527d3..592bb9c7a1 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -613,10 +613,16 @@
# Disabled by default. Experimental: may (or may not) be renamed after
# further testing is complete. (since 1.6)
#
+# @zero-blocks: During storage migration encode blocks of zeroes efficiently. This
+# essentially saves 1MB of zeroes per block on the wire. Enabling requires
+# source and target VM to support this feature. To enable it is sufficient
+# to enable the capability on the source VM. The feature is disabled by
+# default. (since 1.6)
+#
# Since: 1.2
##
{ 'enum': 'MigrationCapability',
- 'data': ['xbzrle', 'x-rdma-pin-all', 'auto-converge'] }
+ 'data': ['xbzrle', 'x-rdma-pin-all', 'auto-converge', 'zero-blocks'] }
##
# @MigrationCapabilityStatus