[Qemu-devel] [PATCH 3/3 v3] Enable migration without shared storage from the monitor

[lirans@il.ibm.com]

This patch adds the option to activate non-shared storage migration from the
monitor.
The migration command is as follows:
(qemu) migrate -d tcp:0:4444 # for ordinary live migration
(qemu) migrate -d -b tcp:0:4444 # for live migration with complete storage copy
(qemu) migrate -d -i tcp:0:4444 # for live migration with incremental storage copy, storage is cow based.

diff --git a/monitor.c b/monitor.c
index 18bcc92..40cdd74 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2582,6 +2582,18 @@ static int default_fmt_size = 4;
 
 #define MAX_ARGS 16
 
+static int is_valid_option(const char *c, const char *typestr)
+{
+  char option[3];
+  
+  option[0] = '-';
+  option[1] = *c;
+  option[2] = '\0';
+  
+  typestr = strstr(typestr, option);
+  return (typestr != NULL);
+}
+
 static const mon_cmd_t *monitor_parse_command(Monitor *mon,
                                               const char *cmdline,
                                               QDict *qdict)
@@ -2774,8 +2786,9 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
             break;
         case '-':
             {
-                int has_option;
-                /* option */
+	        const char *tmp = p;
+	        int has_option, skip_key = 0;
+		/* option */
 
                 c = *typestr++;
                 if (c == '\0')
@@ -2785,15 +2798,24 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
                 has_option = 0;
                 if (*p == '-') {
                     p++;
-                    if (*p != c) {
-                        monitor_printf(mon, "%s: unsupported option -%c\n",
+		    if(c != *p) {
+		        if(!is_valid_option(p, typestr)) {
+                  
+			    monitor_printf(mon, "%s: unsupported option -%c\n",
                                        cmdname, *p);
-                        goto fail;
+			    goto fail;
+			} else {
+			    skip_key = 1;
+			}
                     }
-                    p++;
-                    has_option = 1;
+		    if(skip_key) {
+		        p = tmp;
+		    } else {
+		        p++;
+		        has_option = 1;
+		    }
                 }
-                qdict_put(qdict, key, qint_from_int(has_option));
+		qdict_put(qdict, key, qint_from_int(has_option));
             }
             break;
         default:
diff --git a/qemu-monitor.hx b/qemu-monitor.hx
index 9f91873..44fcad3 100644
--- a/qemu-monitor.hx
+++ b/qemu-monitor.hx
@@ -466,11 +466,13 @@ STEXI
 Inject an NMI on the given CPU (x86 only).
 ETEXI
 
-    { "migrate", "detach:-d,uri:s", do_migrate,
-      "[-d] uri", "migrate to URI (using -d to not wait for completion)" },
+    { "migrate", "detach:-d,blk:-b,inc:-i,uri:s", do_migrate,
+      "[-d] [-b] [-i] uri", "migrate to URI (using -d to not wait for completion)\n\t\t\t -b for migration without shared storage with full copy of disk\n\t\t\t -i for migration without shared storage with incremental copy of disk (base image shared between src and destination)" },
 STEXI
 @item migrate [-d] @var{uri}
 Migrate to @var{uri} (using -d to not wait for completion).
+	-b for migration with full copy of disk
+	-i for migration with incremental copy of disk (base image is shared)
 ETEXI
 
     { "migrate_cancel", "", do_migrate_cancel,