Enable migration without shared storage from the monitor

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.

Changes from v4:
- Minor coding style issues.

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

monitor.c

@@ -2908,6 +2908,18 @@ 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)
@@ -3100,7 +3112,8 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
             break;
         case '-':
             {
-                int has_option;
+                const char *tmp = p;
+                int has_option, skip_key = 0;
                 /* option */
 
                 c = *typestr++;
@@ -3111,14 +3124,23 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
                 has_option = 0;
                 if (*p == '-') {
                     p++;
-                    if (*p != c) {
+                    if(c != *p) {
+                        if(!is_valid_option(p, typestr)) {
+                  
                             monitor_printf(mon, "%s: unsupported option -%c\n",
                                            cmdname, *p);
                             goto fail;
+                        } else {
+                            skip_key = 1;
                         }
+                    }
+                    if(skip_key) {
+                        p = tmp;
+                    } else {
                         p++;
                         has_option = 1;
                     }
+                }
                 qdict_put(qdict, key, qint_from_int(has_option));
             }
             break;

qemu-monitor.hx

@@ -724,16 +724,23 @@ ETEXI
 
     {
         .name       = "migrate",
-        .args_type  = "detach:-d,uri:s",
+        .args_type  = "detach:-d,blk:-b,inc:-i,uri:s",
-        .params     = "[-d] uri",
+        .params     = "[-d] [-b] [-i] uri",
-        .help       = "migrate to URI (using -d to not wait for completion)",
+        .help       = "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)",
         .user_print = monitor_user_noop,	
 	.mhandler.cmd_new = do_migrate,
     },
 
+
 STEXI
-@item migrate [-d] @var{uri}
+@item migrate [-d] [-b] [-i] @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
 
     {