spice: live migration (wip).

Handle spice client migration, i.e. inform a spice client connected
about the new host and connection parameters, so it can move over the
connection automatically.

4 files changed, 101 insertions, 0 deletions

diff --git a/monitor.c b/monitor.c
index 5366c3652..0c5a5e0b7 100644
--- a/monitor.c
+++ b/monitor.c
@@ -56,6 +56,7 @@
 #include "json-parser.h"
 #include "osdep.h"
 #include "exec-all.h"
+#include "qemu-spice.h"
 
 //#define DEBUG
 //#define DEBUG_COMPLETION
diff --git a/qemu-monitor.hx b/qemu-monitor.hx
index 2af3de6c2..f8c38a9f6 100644
--- a/qemu-monitor.hx
+++ b/qemu-monitor.hx
@@ -2497,6 +2497,17 @@ ETEXI
 
 HXCOMM DO NOT add new commands after 'info', move your addition before it!
 
+#if defined(CONFIG_SPICE)
+    {
+        .name       = "spice_migrate_info",
+        .args_type  = "hostname:s,port:i?,tls-port:i?,cert-subject:s?",
+        .params     = "hostname port tls-port cert-subject",
+        .help       = "send migration info to spice client",
+	.user_print = monitor_user_noop,
+        .mhandler.cmd_new = mon_spice_migrate,
+    },
+#endif
+
 STEXI
 @end table
 ETEXI
diff --git a/qemu-spice.h b/qemu-spice.h
index 6f19ba731..3c8e959bf 100644
--- a/qemu-spice.h
+++ b/qemu-spice.h
@@ -16,6 +16,8 @@ void qemu_spice_input_init(void);
 void qemu_spice_audio_init(void);
 void qemu_spice_display_init(DisplayState *ds);
 
+int mon_spice_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data);
+
 #else  /* CONFIG_SPICE */
 
 #define using_spice 0
diff --git a/spice.c b/spice.c
index bc2f1686b..7bbb52fae 100644
--- a/spice.c
+++ b/spice.c
@@ -11,6 +11,7 @@
 #include "qemu-queue.h"
 #include "qemu-x509.h"
 #include "monitor.h"
+#include "hw/hw.h"
 
 /* core bits */
 
@@ -172,8 +173,90 @@ static const char *wan_compression_names[] = {
     parse_name(_name, "wan compression",                                \
                wan_compression_names, ARRAY_SIZE(wan_compression_names))
 
+/* handle client migration */
+
+static int spice_live(Monitor *mon, QEMUFile *f, int stage, void *opaque)
+{
+    static int last_stage;
+    static int migrate_client, client_connected;
+    int ret = 1;
+
+    if (last_stage != stage) {
+        last_stage = stage;
+        fprintf(stderr, "%s: stage %d\n", __FUNCTION__, stage);
+    } else {
+        fprintf(stderr, ".");
+    }
+
+    switch (stage) {
+    case 1:
+        migrate_client = 1;
+        client_connected = 0;
+        fprintf(stderr, "%s: start client migration\n", __FUNCTION__);
+        if (spice_server_migrate_start(spice_server) != 0) {
+            fprintf(stderr, "%s: fail -> no client migration\n", __FUNCTION__);
+            migrate_client = 0;
+        }
+        break;
+    case 2:
+        if (!migrate_client)
+            break;
+        switch (spice_server_migrate_client_state(spice_server)) {
+        case SPICE_MIGRATE_CLIENT_NONE:
+            fprintf(stderr, "%s: no client connected\n", __FUNCTION__);
+            migrate_client = 0;
+            break;
+        case SPICE_MIGRATE_CLIENT_WAITING:
+            ret = 0;
+            break;
+        case SPICE_MIGRATE_CLIENT_READY:
+            if (!client_connected) {
+                fprintf(stderr, "%s: client connected to target\n", __FUNCTION__);
+                client_connected = 1;
+            }
+            break;
+        }
+        break;
+    case 3:
+        if (migrate_client && client_connected) {
+            fprintf(stderr, "%s: finish client migration\n", __FUNCTION__);
+            spice_server_migrate_end(spice_server, 1);
+        }
+        break;
+    }
+    return ret;
+}
+
+static void spice_save(QEMUFile *f, void *opaque)
+{
+    fprintf(stderr, "%s:\n", __FUNCTION__);
+}
+
+static int spice_load(QEMUFile *f, void *opaque, int version_id)
+{
+    fprintf(stderr, "%s:\n", __FUNCTION__);
+    return 0;
+}
+
 /* functions for the rest of qemu */
 
+int mon_spice_migrate(Monitor *mon, const QDict *qdict, QObject **ret_data)
+{
+    const char *hostname = qdict_get_str(qdict, "hostname");
+    const char *subject  = qdict_get_try_str(qdict, "cert-subject");
+    int port             = qdict_get_try_int(qdict, "port", -1);
+    int tls_port         = qdict_get_try_int(qdict, "tls-port", -1);
+
+    if (!spice_server) {
+        qerror_report(QERR_DEVICE_NOT_ACTIVE, "spice");
+        return -1;
+    }
+
+    /* TODO: Convert to QError */
+    return spice_server_migrate_info(spice_server, hostname,
+                                     port, tls_port, subject);
+}
+
 void qemu_spice_init(void)
 {
     QemuOpts *opts = QTAILQ_FIRST(&qemu_spice_opts.head);
@@ -276,6 +359,10 @@ void qemu_spice_init(void)
     qemu_spice_input_init();
     qemu_spice_audio_init();
 
+    register_savevm_live(NULL, "spice", -1, 1, NULL,
+                         spice_live, spice_save, spice_load,
+                         spice_server);
+
     qemu_free(x509_key_file);
     qemu_free(x509_cert_file);
     qemu_free(x509_cacert_file);