[PATCH v6 1/9] migration: introduced 'MigrateAddress' in QAPI for migration wire protocol.

[Het Gala]

This patch introduces well defined MigrateAddress struct and its related
child objects.

The existing argument of 'migrate' and 'migrate-incoming' QAPI - 'uri'
is of string type. The current migration flow follows double encoding
scheme for  fetching migration parameters such as 'uri' and this is
not an ideal design.

Motive for intoducing struct level design is to prevent double encoding
of QAPI arguments, as Qemu should be able to directly use the QAPI
arguments without any level of encoding.

Suggested-by: Aravind Retnakaran <aravind.retnakaran@nutanix.com>
Signed-off-by: Het Gala <het.gala@nutanix.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
---
 qapi/migration.json | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/qapi/migration.json b/qapi/migration.json
index 179af0c4d8..e61d25eba2 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -1407,6 +1407,51 @@
 ##
 { 'command': 'migrate-continue', 'data': {'state': 'MigrationStatus'} }
 
+##
+# @MigrationAddressType:
+#
+# The migration stream transport mechanisms.
+#
+# @socket: Migrate via socket.
+#
+# @exec: Direct the migration stream to another process.
+#
+# @rdma: Migrate via RDMA.
+#
+# Since 8.1
+##
+{ 'enum': 'MigrationAddressType',
+  'data': ['socket', 'exec', 'rdma'] }
+
+##
+# @MigrationExecCommand:
+#
+# @args: list of commands for migraton stream execution to a file.
+#
+# Notes:
+#
+# 1. @args[0] needs to be the path to the new program.
+#
+# Since 8.1
+##
+{ 'struct': 'MigrationExecCommand',
+  'data': {'args': [ 'str' ] } }
+
+##
+# @MigrationAddress:
+#
+# Migration endpoint configuration.
+#
+# Since 8.1
+##
+{ 'union': 'MigrationAddress',
+  'base': { 'transport' : 'MigrationAddressType'},
+  'discriminator': 'transport',
+  'data': {
+    'socket': 'SocketAddress',
+    'exec': 'MigrationExecCommand',
+    'rdma': 'InetSocketAddress' } }
+
 ##
 # @migrate:
 #
-- 
2.22.3