configure xen in a single place

Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/configure b/configure
index 0c3c27d..4b3ee9b 100755
--- a/configure
+++ b/configure
@@ -1993,11 +1993,6 @@
       echo "KVM_CFLAGS=$kvm_cflags" >> $config_mak
       echo "#define CONFIG_KVM 1" >> $config_h
     fi
-    if test "$xen" = "yes" -a "$target_softmmu" = "yes";
-    then
-      echo "CONFIG_XEN=y" >> $config_mak
-      echo "#define CONFIG_XEN 1" >> $config_h
-    fi
     target_phys_bits=32
   ;;
   x86_64)
@@ -2016,11 +2011,6 @@
       echo "KVM_CFLAGS=$kvm_cflags" >> $config_mak
       echo "#define CONFIG_KVM 1" >> $config_h
     fi
-    if test "$xen" = "yes" -a "$target_softmmu" = "yes"
-    then
-      echo "CONFIG_XEN=y" >> $config_mak
-      echo "#define CONFIG_XEN 1" >> $config_h
-    fi
     target_phys_bits=64
   ;;
   alpha)
@@ -2177,6 +2167,13 @@
 if [ $target_phys_bits -lt $hostlongbits ] ; then
   target_phys_bits=$hostlongbits
 fi
+case "$target_arch2" in
+  i386|x86_64)
+    if test "$xen" = "yes" -a "$target_softmmu" = "yes" ; then
+      echo "CONFIG_XEN=y" >> $config_mak
+      echo "#define CONFIG_XEN 1" >> $config_h
+    fi
+esac
 echo "HWLIB=../libhw$target_phys_bits/libqemuhw$target_phys_bits.a" >> $config_mak
 echo "#define TARGET_PHYS_ADDR_BITS $target_phys_bits" >> $config_h
 echo "subdir-$target: subdir-libhw$target_phys_bits" >> $config_host_mak