[Qemu-devel] [PATCH 11/18] migration: introduce capability localhost

[Lei Li <lilei@linux.vnet.ibm.com>]

Introduce migration capability localhost.

Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
---
 include/migration/migration.h |    3 +++
 migration.c                   |   12 ++++++++++++
 qapi-schema.json              |    8 +++++++-
 3 files changed, 22 insertions(+), 1 deletions(-)

diff --git a/include/migration/migration.h b/include/migration/migration.h
index d2c7eff..a04f050 100644
--- a/include/migration/migration.h
+++ b/include/migration/migration.h
@@ -143,10 +143,13 @@ void migrate_add_blocker(Error *reason);
 void migrate_del_blocker(Error *reason);
 
 bool migrate_rdma_pin_all(void);
+
 bool migrate_zero_blocks(void);
 
 bool migrate_auto_converge(void);
 
+bool migrate_is_localhost(void);
+
 int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t *new_buf, int slen,
                          uint8_t *dst, int dlen);
 int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen);
diff --git a/migration.c b/migration.c
index 2446a6a..2f85358 100644
--- a/migration.c
+++ b/migration.c
@@ -420,6 +420,9 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
     } else if (strstart(uri, "exec:", &p)) {
         exec_start_outgoing_migration(s, p, &local_err);
     } else if (strstart(uri, "unix:", &p)) {
+        if (s->enabled_capabilities[MIGRATION_CAPABILITY_LOCALHOST]) {
+            local_start_outgoing_migration(s, p, &local_err);
+        }
         unix_start_outgoing_migration(s, p, &local_err);
     } else if (strstart(uri, "fd:", &p)) {
         fd_start_outgoing_migration(s, p, &local_err);
@@ -521,6 +524,15 @@ int migrate_use_xbzrle(void)
     return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
 }
 
+bool migrate_is_localhost(void)
+{
+    MigrationState *s;
+
+    s = migrate_get_current();
+
+    return s->enabled_capabilities[MIGRATION_CAPABILITY_LOCALHOST];
+}
+
 int64_t migrate_xbzrle_cache_size(void)
 {
     MigrationState *s;
diff --git a/qapi-schema.json b/qapi-schema.json
index a51f7d2..557337f 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -629,10 +629,16 @@
 # @auto-converge: If enabled, QEMU will automatically throttle down the guest
 #          to speed up convergence of RAM migration. (since 1.6)
 #
+# @localhost: If enabled, QEMU will support localhost migration. This feature
+#             allows live upgrade of a running QEMU instance by doing localhost
+#             migration with page flipping. It requires the source and destination
+#             are both on localhost. Disabled by default. (since 1.7)
+#
 # Since: 1.2
 ##
 { 'enum': 'MigrationCapability',
-  'data': ['xbzrle', 'x-rdma-pin-all', 'auto-converge', 'zero-blocks'] }
+  'data': ['xbzrle', 'x-rdma-pin-all', 'auto-converge', 'zero-blocks',
+           'localhost'] }
 
 ##
 # @MigrationCapabilityStatus
-- 
1.7.7.6