From c6c153bfd7f9da48eb541d78bf09bc03bcc337e5 Mon Sep 17 00:00:00 2001
From: Cole Robinson <crobinso@redhat.com>
Date: Tue, 19 Feb 2013 14:39:05 -0500
Subject: [PATCH] configure: Add --enable-migration-from-qemu-kvm

This switch will turn on all the migration compat bits needed to
perform migration from qemu-kvm to qemu. It's just a stub for now.

This compat will break incoming migration from qemu < 1.3, but for
distros where qemu-kvm was the only shipped package for years it's
not a big loss (and I don't know any way to avoid it).

Signed-off-by: Cole Robinson <crobinso@redhat.com>
---
 configure | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/configure b/configure
index e7468a9..719e348 100755
--- a/configure
+++ b/configure
@@ -170,6 +170,7 @@ xfs=""
 
 vhost_net="no"
 kvm="no"
+migrate_from_kvm="no"
 gprof="no"
 debug_tcg="no"
 debug="no"
@@ -759,6 +760,8 @@ for opt do
   ;;
   --enable-kvm) kvm="yes"
   ;;
+  --enable-migration-from-qemu-kvm) migrate_from_kvm="yes"
+  ;;
   --disable-tcg-interpreter) tcg_interpreter="no"
   ;;
   --enable-tcg-interpreter) tcg_interpreter="yes"
@@ -1087,6 +1090,9 @@ echo "  --enable-bluez           enable bluez stack connectivity"
 echo "  --disable-slirp          disable SLIRP userspace network connectivity"
 echo "  --disable-kvm            disable KVM acceleration support"
 echo "  --enable-kvm             enable KVM acceleration support"
+echo "  --enable-migration-from-qemu-kvm  Allow migration from qemu-kvm."
+echo "                                    This will break migration from "
+echo "                                    qemu < 1.3 in most cases"
 echo "  --enable-tcg-interpreter enable TCG with bytecode interpreter (TCI)"
 echo "  --disable-nptl           disable usermode NPTL support"
 echo "  --enable-nptl            enable usermode NPTL support"
@@ -3324,6 +3330,7 @@ echo "Linux AIO support $linux_aio"
 echo "ATTR/XATTR support $attr"
 echo "Install blobs     $blobs"
 echo "KVM support       $kvm"
+echo "Migrate from qemu-kvm $migrate_from_kvm"
 echo "TCG interpreter   $tcg_interpreter"
 echo "fdt support       $fdt"
 echo "preadv support    $preadv"
@@ -3612,6 +3619,9 @@ fi
 if test "$signalfd" = "yes" ; then
   echo "CONFIG_SIGNALFD=y" >> $config_host_mak
 fi
+if test "$migrate_from_kvm" = "yes"; then
+  echo "CONFIG_MIGRATE_FROM_QEMU_KVM=y" >> $config_host_mak
+fi
 if test "$tcg_interpreter" = "yes" ; then
   echo "CONFIG_TCG_INTERPRETER=y" >> $config_host_mak
 fi