configure --enable-colo/--disable-colo to switch COLO
support on/off.
COLO feature is enabled by default.

Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com>
Signed-off-by: Li Zhijian <lizhij...@cn.fujitsu.com>
Signed-off-by: Gonglei <arei.gong...@huawei.com>
Reviewed-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
---
v19:
- fix colo_supported() to return true
v11:
- Turn COLO on in default (Eric's suggestion)
---
 configure        | 11 +++++++++++
 migration/colo.c |  2 +-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index dd9e679..6cf3f99 100755
--- a/configure
+++ b/configure
@@ -230,6 +230,7 @@ vhost_net="no"
 vhost_scsi="no"
 vhost_vsock="no"
 kvm="no"
+colo="yes"
 rdma=""
 gprof="no"
 debug_tcg="no"
@@ -918,6 +919,10 @@ for opt do
   ;;
   --enable-kvm) kvm="yes"
   ;;
+  --disable-colo) colo="no"
+  ;;
+  --enable-colo) colo="yes"
+  ;;
   --disable-tcg-interpreter) tcg_interpreter="no"
   ;;
   --enable-tcg-interpreter) tcg_interpreter="yes"
@@ -1363,6 +1368,7 @@ disabled with --disable-FEATURE, default is enabled if 
available:
   fdt             fdt device tree
   bluez           bluez stack connectivity
   kvm             KVM acceleration support
+  colo            COarse-grain LOck-stepping VM for Non-stop Service
   rdma            RDMA-based migration support
   vde             support for vde network
   netmap          support for netmap network
@@ -4911,6 +4917,7 @@ echo "Linux AIO support $linux_aio"
 echo "ATTR/XATTR support $attr"
 echo "Install blobs     $blobs"
 echo "KVM support       $kvm"
+echo "COLO support      $colo"
 echo "RDMA support      $rdma"
 echo "TCG interpreter   $tcg_interpreter"
 echo "fdt support       $fdt"
@@ -5532,6 +5539,10 @@ if have_backend "syslog"; then
 fi
 echo "CONFIG_TRACE_FILE=$trace_file" >> $config_host_mak
 
+if test "$colo" = "yes"; then
+  echo "CONFIG_COLO=y" >> $config_host_mak
+fi
+
 if test "$rdma" = "yes" ; then
   echo "CONFIG_RDMA=y" >> $config_host_mak
 fi
diff --git a/migration/colo.c b/migration/colo.c
index 31664e0..a39cd99 100644
--- a/migration/colo.c
+++ b/migration/colo.c
@@ -24,7 +24,7 @@
 
 bool colo_supported(void)
 {
-    return false;
+    return true;
 }
 
 bool migration_in_colo_state(void)
-- 
1.8.3.1



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