[Qemu-devel] [PATCH 1/3] migration: Create block capabilities for shared and enable

[Juan Quintela <quintela@redhat.com>]

Those two capabilities were added through the command line.  Notice that
we just created them.  This is just the boilerplate.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
 include/migration/migration.h |  3 +++
 migration/migration.c         | 36 ++++++++++++++++++++++++++++++++++++
 qapi-schema.json              |  7 ++++++-
 3 files changed, 45 insertions(+), 1 deletion(-)

diff --git a/include/migration/migration.h b/include/migration/migration.h
index dfeca38..618ab0e 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -307,6 +307,9 @@ bool migrate_colo_enabled(void);
 
 int64_t xbzrle_cache_resize(int64_t new_size);
 
+bool migrate_use_block_enabled(void);
+bool migrate_use_block_shared(void);
+
 bool migrate_use_compression(void);
 int migrate_compress_level(void);
 int migrate_compress_threads(void);
diff --git a/migration/migration.c b/migration/migration.c
index 5447cab..775b24c 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1195,6 +1195,16 @@ bool migration_is_blocked(Error **errp)
     return false;
 }
 
+static void migrate_set_block_shared(MigrationState *s)
+{
+    s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK_SHARED] = true;
+}
+
+static void migrate_set_block_enabled(MigrationState *s)
+{
+    s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK_ENABLED] = true;
+}
+
 void qmp_migrate(const char *uri, bool has_blk, bool blk,
                  bool has_inc, bool inc, bool has_detach, bool detach,
                  Error **errp)
@@ -1224,6 +1234,14 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
 
     s = migrate_init(&params);
 
+    if (has_blk && blk) {
+        migrate_set_block_enabled(s);
+    }
+
+    if (has_inc && inc) {
+        migrate_set_block_shared(s);
+    }
+
     if (strstart(uri, "tcp:", &p)) {
         tcp_start_outgoing_migration(s, p, &local_err);
 #ifdef CONFIG_RDMA
@@ -1419,6 +1437,24 @@ int64_t migrate_xbzrle_cache_size(void)
     return s->xbzrle_cache_size;
 }
 
+bool migrate_use_block_enabled(void)
+{
+    MigrationState *s;
+
+    s = migrate_get_current();
+
+    return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK_ENABLED];
+}
+
+bool migrate_use_block_shared(void)
+{
+    MigrationState *s;
+
+    s = migrate_get_current();
+
+    return s->enabled_capabilities[MIGRATION_CAPABILITY_BLOCK_SHARED];
+}
+
 /* migration thread support */
 /*
  * Something bad happened to the RP stream, mark an error
diff --git a/qapi-schema.json b/qapi-schema.json
index 01b087f..e963bb3 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -894,11 +894,16 @@
 # @release-ram: if enabled, qemu will free the migrated ram pages on the source
 #        during postcopy-ram migration. (since 2.9)
 #
+# @block-enabled: enable block migration (Since 2.10)
+#
+# @block-shared: enable block shared migration (Since 2.10)
+#
 # Since: 1.2
 ##
 { 'enum': 'MigrationCapability',
   'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
-           'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram'] }
+           'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram',
+           'block-enabled', 'block-shared' ] }
 
 ##
 # @MigrationCapabilityStatus:
-- 
2.9.3