Block live migration

This patch introduces block migration called during live migration. Block
are being copied to the destination in an async way. First the code will
transfer the whole disk and then transfer all dirty blocks accumulted during
the migration.
Still need to improve transition from the iterative phase of migration to the
end phase. For now transition will take place when all blocks transfered once,
all the dirty blocks will be transfered during the end phase (guest is
suspended).

Changes from v4:
- Global variabels moved to a global state structure allocated dynamically.
- Minor coding style issues.
- Poll block.c for tracking of dirty blocks instead of manage it here.

Signed-off-by: Liran Schour <lirans@il.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 16 insertions, 7 deletions

diff --git a/migration.c b/migration.c
index b20beb730..3ae0be86c 100644
--- a/migration.c
+++ b/migration.c
@@ -58,16 +58,24 @@ void do_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
     const char *p;
     int detach = qdict_get_int(qdict, "detach");
     const char *uri = qdict_get_str(qdict, "uri");
-
+    
     if (strstart(uri, "tcp:", &p))
-        s = tcp_start_outgoing_migration(p, max_throttle, detach);
+        s = tcp_start_outgoing_migration(p, max_throttle, detach, 
+                                         (int)qdict_get_int(qdict, "blk"), 
+                                         (int)qdict_get_int(qdict, "inc"));
 #if !defined(WIN32)
     else if (strstart(uri, "exec:", &p))
-        s = exec_start_outgoing_migration(p, max_throttle, detach);
+        s = exec_start_outgoing_migration(p, max_throttle, detach, 
+                                          (int)qdict_get_int(qdict, "blk"), 
+                                          (int)qdict_get_int(qdict, "inc"));
     else if (strstart(uri, "unix:", &p))
-        s = unix_start_outgoing_migration(p, max_throttle, detach);
+        s = unix_start_outgoing_migration(p, max_throttle, detach, 
+					  (int)qdict_get_int(qdict, "blk"), 
+                                          (int)qdict_get_int(qdict, "inc"));
     else if (strstart(uri, "fd:", &p))
-        s = fd_start_outgoing_migration(mon, p, max_throttle, detach);
+        s = fd_start_outgoing_migration(mon, p, max_throttle, detach, 
+                                        (int)qdict_get_int(qdict, "blk"), 
+                                        (int)qdict_get_int(qdict, "inc"));
 #endif
     else
         monitor_printf(mon, "unknown migration protocol: %s\n", uri);
@@ -251,13 +259,14 @@ void migrate_fd_connect(FdMigrationState *s)
                                       migrate_fd_close);
 
     dprintf("beginning savevm\n");
-    ret = qemu_savevm_state_begin(s->file);
+    ret = qemu_savevm_state_begin(s->file, s->mig_state.blk, 
+                                  s->mig_state.shared);
     if (ret < 0) {
         dprintf("failed, %d\n", ret);
         migrate_fd_error(s);
         return;
     }
-
+    
     migrate_fd_put_ready(s);
 }