migration-test: Make machine_opts regular with other options

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20230608224943.3877-5-quintela@redhat.com>

tests/qtest/migration-test.c

@@ -637,7 +637,7 @@ static int test_migrate_start(QTestState **from, QTestState **to,
         start_address = S390_TEST_MEM_START;
         end_address = S390_TEST_MEM_END;
     } else if (strcmp(arch, "ppc64") == 0) {
-        machine_opts = "vsmt=8";
+        machine_opts = "-machine vsmt=8";
         memory_size = "256M";
         start_address = PPC_TEST_MEM_START;
         end_address = PPC_TEST_MEM_END;
@@ -649,7 +649,7 @@ static int test_migrate_start(QTestState **from, QTestState **to,
         arch_target = g_strdup("-nodefaults");
     } else if (strcmp(arch, "aarch64") == 0) {
         init_bootfile(bootpath, aarch64_kernel, sizeof(aarch64_kernel));
-        machine_opts = "virt,gic-version=max";
+        machine_opts = "-machine virt,gic-version=max";
         memory_size = "150M";
         arch_source = g_strdup_printf("-cpu max "
                                       "-kernel %s",
@@ -689,14 +689,13 @@ static int test_migrate_start(QTestState **from, QTestState **to,
         shmem_opts = g_strdup("");
     }
 
-    cmd_source = g_strdup_printf("-accel kvm%s -accel tcg%s%s "
+    cmd_source = g_strdup_printf("-accel kvm%s -accel tcg %s "
                                  "-name source,debug-threads=on "
                                  "-m %s "
                                  "-serial file:%s/src_serial "
                                  "%s %s %s %s",
                                  args->use_dirty_ring ?
                                  ",dirty-ring-size=4096" : "",
-                                 machine_opts ? " -machine " : "",
                                  machine_opts ? machine_opts : "",
                                  memory_size, tmpfs,
                                  arch_source, shmem_opts,
@@ -709,15 +708,14 @@ static int test_migrate_start(QTestState **from, QTestState **to,
                                      &got_src_stop);
     }
 
-    cmd_target = g_strdup_printf("-accel kvm%s -accel tcg%s%s "
+    cmd_target = g_strdup_printf("-accel kvm%s -accel tcg %s "
                                  "-name target,debug-threads=on "
                                  "-m %s "
                                  "-serial file:%s/dest_serial "
                                  "-incoming %s "
                                  "%s %s %s %s",
                                  args->use_dirty_ring ?
                                  ",dirty-ring-size=4096" : "",
-                                 machine_opts ? " -machine " : "",
                                  machine_opts ? machine_opts : "",
                                  memory_size, tmpfs, uri,
                                  arch_target, shmem_opts,