From ca381fbec3841313d35011a2b6b390200f28d404 Mon Sep 17 00:00:00 2001
From: Uri Lublin <uril@redhat.com>
Date: Wed, 21 Jan 2009 15:29:52 +0200
Subject: [PATCH 31/54] qemu: notify (async) management when migration finished at destination

SolidICE wants to know when a VM has migrated to another node.
After that event happens, it takes down the source VM and informs the
administrator of a successful migration.

The source can ask for "info migration".
The destination waits for an asynchronous notification.

This patch provides that notification by emitting
a message to qemu monitor, telling vdsm of the
successful completion of the migration process.

Remember to "notify migration on" on destination before
migration starts.

This is a modification of the patch Dan Kenigsberg sent to the list,
making use of Amit's asynchronous notifications.

Signed-off-by: Uri Lublin <uril@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
RH-Type: improvement
RH-Upstream-status: pending
---
 qemu/console.h       |    3 ++-
 qemu/migration-tcp.c |    1 +
 qemu/monitor.c       |    4 +++-
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/qemu/console.h b/qemu/console.h
index c969c6a..c8c95ec 100644
--- a/qemu/console.h
+++ b/qemu/console.h
@@ -191,7 +191,8 @@ extern uint8_t _translate_keycode(const int key);
 #define VNC_ASYNC_EVENT   1
 #define RTC_ASYNC_EVENT   2
 #define SHUTDOWN_ASYNC_EVENT 3
-#define MAX_ASYNC_EVENTS  SHUTDOWN_ASYNC_EVENT
+#define MIGRATION_ASYNC_EVENT 4
+#define MAX_ASYNC_EVENTS  MIGRATION_ASYNC_EVENT
 
 /* FIXME: term_printf et al should probably go elsewhere so everything
    does not need to include console.h  */
diff --git a/qemu/migration-tcp.c b/qemu/migration-tcp.c
index a0e347d..9acfd5c 100644
--- a/qemu/migration-tcp.c
+++ b/qemu/migration-tcp.c
@@ -450,6 +450,7 @@ static void tcp_incoming_load_vm(void)
     qemu_set_fd_handler2(in_state.listener, NULL, NULL, NULL, NULL);
     close(in_state.listener);
     in_state.listener = -1;
+    term_printf_async(MIGRATION_ASYNC_EVENT, "migration: migration process finished\n");
     vm_start();
 
 error:
diff --git a/qemu/monitor.c b/qemu/monitor.c
index d2078f8..e80b70c 100644
--- a/qemu/monitor.c
+++ b/qemu/monitor.c
@@ -253,6 +253,8 @@ static void do_notify_async_events(char *event_str, char *enable)
         event = RTC_ASYNC_EVENT;
     else if (!strcmp(event_str, "shutdown"))
         event = SHUTDOWN_ASYNC_EVENT;
+    else if (!strcmp(event_str, "migration"))
+        event = MIGRATION_ASYNC_EVENT;
     else
         return;
 
@@ -1611,7 +1613,7 @@ static term_cmd_t term_cmds[] = {
     { "set_qxl_log_level", "i", qxl_do_set_log_level, "", "set qxl log level" },
 #endif
     { "notify", "ss", do_notify_async_events,
-      "vnc|rtc|shutdown on|off", "enable / disable printing of notifications for the specified event" },
+      "vnc|rtc|shutdown|migration on|off", "enable / disable printing of notifications for the specified event" },
     { NULL, NULL, },
 };
 
-- 
1.6.1