monitor: Make client_migrate_info synchronous
Live migration with spice works like this today:
(1) client_migrate_info monitor cmd
(2) spice server notifies client, client connects to target host.
(3) qemu waits until spice client connect is finished.
(4) send over vmstate (i.e. main part of live migration).
(5) spice handover to target host.
(3) is implemented by making client_migrate_info a async monitor
command. This is the only async monitor command we have.
The original reason to implement this dance was that qemu did not accept
new tcp connections while the incoming migration was running, so (2) and
(4) could not be done in parallel. That issue was fixed long ago though.
Qemu version 1.3.0 (released Dec 2012) and newer happily accept tcp
connects while the incoming migration runs.
Time to drop step (3). This patch does exactly that, by making the
monitor command synchronous and removing the code needed to handle the
async monitor command in ui/spice-core.c
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 3089533..a6de819 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -998,8 +998,7 @@
.params = "protocol hostname port tls-port cert-subject",
.help = "send migration info to spice/vnc client",
.user_print = monitor_user_noop,
- .mhandler.cmd_async = client_migrate_info,
- .flags = MONITOR_CMD_ASYNC,
+ .mhandler.cmd_new = client_migrate_info,
},
STEXI
diff --git a/include/ui/qemu-spice.h b/include/ui/qemu-spice.h
index 25b94c7..42db3c1 100644
--- a/include/ui/qemu-spice.h
+++ b/include/ui/qemu-spice.h
@@ -42,8 +42,7 @@
bool fail_if_connected, bool disconnect_if_connected);
int qemu_spice_set_pw_expire(time_t expires);
int qemu_spice_migrate_info(const char *hostname, int port, int tls_port,
- const char *subject,
- MonitorCompletion cb, void *opaque);
+ const char *subject);
CharDriverState *qemu_chr_open_spice_vmc(const char *type);
#if SPICE_SERVER_VERSION >= 0x000c02
@@ -70,10 +69,8 @@
return -1;
}
static inline int qemu_spice_migrate_info(const char *h, int p, int t,
- const char *s,
- MonitorCompletion cb, void *opaque)
+ const char *s)
{
- cb(opaque, NULL);
return -1;
}
diff --git a/monitor.c b/monitor.c
index 68873ec..4b64037 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1086,7 +1086,7 @@
}
static int client_migrate_info(Monitor *mon, const QDict *qdict,
- MonitorCompletion cb, void *opaque)
+ QObject **ret_data)
{
const char *protocol = qdict_get_str(qdict, "protocol");
const char *hostname = qdict_get_str(qdict, "hostname");
@@ -1108,8 +1108,7 @@
return -1;
}
- ret = qemu_spice_migrate_info(hostname, port, tls_port, subject,
- cb, opaque);
+ ret = qemu_spice_migrate_info(hostname, port, tls_port, subject);
if (ret != 0) {
qerror_report(QERR_UNDEFINED_ERROR);
return -1;
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 3a42ad0..35ef759 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -785,8 +785,7 @@
.args_type = "protocol:s,hostname:s,port:i?,tls-port:i?,cert-subject:s?",
.params = "protocol hostname port tls-port cert-subject",
.help = "send migration info to spice/vnc client",
- .mhandler.cmd_async = client_migrate_info,
- .flags = MONITOR_CMD_ASYNC,
+ .mhandler.cmd_new = client_migrate_info,
},
SQMP
diff --git a/ui/spice-core.c b/ui/spice-core.c
index c8f7f18..f00e074 100644
--- a/ui/spice-core.c
+++ b/ui/spice-core.c
@@ -273,14 +273,6 @@
.channel_event = channel_event,
};
-typedef struct SpiceMigration {
- SpiceMigrateInstance sin;
- struct {
- MonitorCompletion *cb;
- void *opaque;
- } connect_complete;
-} SpiceMigration;
-
static void migrate_connect_complete_cb(SpiceMigrateInstance *sin);
static void migrate_end_complete_cb(SpiceMigrateInstance *sin);
@@ -293,15 +285,11 @@
.migrate_end_complete = migrate_end_complete_cb,
};
-static SpiceMigration spice_migrate;
+static SpiceMigrateInstance spice_migrate;
static void migrate_connect_complete_cb(SpiceMigrateInstance *sin)
{
- SpiceMigration *sm = container_of(sin, SpiceMigration, sin);
- if (sm->connect_complete.cb) {
- sm->connect_complete.cb(sm->connect_complete.opaque, NULL);
- }
- sm->connect_complete.cb = NULL;
+ /* nothing, but libspice-server expects this cb being present. */
}
static void migrate_end_complete_cb(SpiceMigrateInstance *sin)
@@ -585,13 +573,10 @@
}
int qemu_spice_migrate_info(const char *hostname, int port, int tls_port,
- const char *subject,
- MonitorCompletion *cb, void *opaque)
+ const char *subject)
{
int ret;
- spice_migrate.connect_complete.cb = cb;
- spice_migrate.connect_complete.opaque = opaque;
ret = spice_server_migrate_connect(spice_server, hostname,
port, tls_port, subject);
spice_have_target_host = true;
@@ -812,9 +797,8 @@
migration_state.notify = migration_state_notifier;
add_migration_state_change_notifier(&migration_state);
- spice_migrate.sin.base.sif = &migrate_interface.base;
- spice_migrate.connect_complete.cb = NULL;
- qemu_spice_add_interface(&spice_migrate.sin.base);
+ spice_migrate.base.sif = &migrate_interface.base;
+ qemu_spice_add_interface(&spice_migrate.base);
qemu_spice_input_init();
qemu_spice_audio_init();
